Mechanics and Thermal Physics

Mechanical Properties - Hooke's Law in car shock absorbers

By the end of the lesson, the learner should be able to:

- Explain application of Hooke's Law in shock absorbers
- Describe how suspension systems work
- Relate overloading of vehicles to damage of shock absorbers

In groups, learners are guided to:

- Research application of Hooke's Law in car shock absorbers
- Discuss how shock absorbers compress and extend
- Explain damping effect in suspension systems
- Discuss effects of overloading on vehicle springs

How do shock absorbers provide a smooth ride on bumpy roads?

- Spotlight Physics Grade 10 pg. 47
- Shock absorber diagrams
- Digital resources

- Oral questions - Written assignments - Research presentations

Mechanics and Thermal Physics

Mechanical Properties - Tensile stress and strain

By the end of the lesson, the learner should be able to:

- Define tensile stress and tensile strain
- Calculate stress and strain using formulae
- Apply stress-strain concepts to engineering structures like bridges and buildings

In groups, learners are guided to:

- Discuss meaning of tensile stress (Force/Area) and tensile strain (extension/original length)
- Derive formula for stress and strain
- Solve numerical problems involving stress and strain

Why is stress measured in N/m² while strain has no units?

- Spotlight Physics Grade 10 pg. 48
- Scientific calculators
- Worked examples

- Numerical exercises - Written tests - Oral questions

Mechanics and Thermal Physics

Mechanical Properties - Tensile stress and strain

By the end of the lesson, the learner should be able to:

- Define tensile stress and tensile strain
- Calculate stress and strain using formulae
- Apply stress-strain concepts to engineering structures like bridges and buildings

In groups, learners are guided to:

- Discuss meaning of tensile stress (Force/Area) and tensile strain (extension/original length)
- Derive formula for stress and strain
- Solve numerical problems involving stress and strain

Why is stress measured in N/m² while strain has no units?

- Spotlight Physics Grade 10 pg. 48
- Scientific calculators
- Worked examples

- Numerical exercises - Written tests - Oral questions

Mechanics and Thermal Physics

Mechanical Properties - Young's Modulus determination

By the end of the lesson, the learner should be able to:

- Define Young's Modulus
- Calculate Young's Modulus from stress and strain
- Interpret stress-strain graphs for material selection in construction

In groups, learners are guided to:

- Derive Young's Modulus as ratio of stress to strain
- Plot stress-strain graph and identify regions
- Identify elastic limit, yield point and breaking point
- Solve problems involving Young's Modulus

What does the stress-strain graph tell us about material behavior?

- Spotlight Physics Grade 10 pg. 50
- Graph papers
- Scientific calculators

- Graph interpretation - Numerical problems - Written tests

Mechanics and Thermal Physics

Mechanical Properties - Industrial applications

By the end of the lesson, the learner should be able to:

- Describe industrial applications of mechanical properties
- Select appropriate materials for specific applications
- Apply material selection principles to everyday items like scissors, springs and brake pads

In groups, learners are guided to:

- Research applications in manufacturing, automobile and construction industries
- Discuss material selection for bridges, wires, cutting tools
- Identify properties required for various products
- Present findings on importance of mechanical properties

Why do engineers study mechanical properties before selecting materials?

- Spotlight Physics Grade 10 pg. 52
- Digital resources
- Sample products (springs, wires, tools)

- Presentations - Oral questions - Written assignments

Mechanics and Thermal Physics

Temperature and Thermal Expansion - Meaning of temperature
Temperature and Thermal Expansion - Temperature conversion

By the end of the lesson, the learner should be able to:

- Define temperature as a measure of degree of hotness or coldness
- Identify the SI unit of temperature and other units
- Relate temperature measurement to everyday activities like cooking and weather forecasting

In groups, learners are guided to:
- Discuss with peers the meaning of temperature
- Carry out activities to demonstrate hotness and coldness using water at different temperatures
- Use digital resources to search for temperature units and conversion formulas

How do we measure the degree of hotness or coldness of a body?

- Spotlight Physics Learner's Book pg. 56
- Bowls of water at different temperatures
- Digital resources
- Scientific calculators

- Oral questions - Observation - Written assignments

Mechanics and Thermal Physics

Temperature and Thermal Expansion - Liquid-in-glass thermometers

By the end of the lesson, the learner should be able to:

- Identify parts of a liquid-in-glass thermometer
- Describe the working principle of alcohol-in-glass thermometer
- Relate liquid-in-glass thermometers to medical and laboratory temperature measurements

In groups, learners are guided to:
- Identify and draw liquid-in-glass thermometer and label its parts
- Measure temperature of water at different temperatures using alcohol thermometer
- Discuss advantages and limitations of alcohol thermometers

How does liquid expansion help in measuring temperature?

- Spotlight Physics Learner's Book pg. 57
- Alcohol-in-glass thermometer
- Beakers with water
- Heat source

- Practical assessment - Observation - Oral questions

Mechanics and Thermal Physics

Temperature and Thermal Expansion - Clinical thermometer
Temperature and Thermal Expansion - Thermocouple thermometer

By the end of the lesson, the learner should be able to:

- Identify features of a clinical thermometer
- Explain the function of the constriction in clinical thermometers
- Connect clinical thermometer use to healthcare and disease diagnosis

In groups, learners are guided to:
- Draw and label parts of a clinical thermometer
- Measure body temperature using a clinical thermometer
- Discuss why clinical thermometers have constrictions

Why does a clinical thermometer have a constriction?

- Spotlight Physics Learner's Book pg. 59
- Clinical thermometer
- Antiseptic
- Cotton wool
- Spotlight Physics Learner's Book pg. 60
- Thermocouple with voltmeter
- Heat source
- Melting ice

- Practical assessment - Oral questions - Written tests

Mechanics and Thermal Physics

Temperature and Thermal Expansion - RTDs and thermistors

By the end of the lesson, the learner should be able to:

- Explain how resistance changes with temperature in RTDs
- Differentiate between RTDs and thermistors
- Connect RTDs and thermistors to modern digital thermometers and electronic devices

In groups, learners are guided to:
- Use digital resources to search for information on RTDs and thermistors
- Compare RTD and thermistor thermometers
- Discuss applications in modern electronics

How does electrical resistance help in measuring temperature?

- Spotlight Physics Learner's Book pg. 61
- Digital thermometer
- Digital resources
- Reference books

- Oral questions - Written assignments - Group presentations

Mechanics and Thermal Physics

Temperature and Thermal Expansion - Infrared and bimetallic thermometers
Temperature and Thermal Expansion - Expansion in solids

By the end of the lesson, the learner should be able to:

- Explain the working principle of infrared thermometers
- Describe how bimetallic strips work in thermometers
- Relate infrared thermometers to contactless temperature screening in hospitals and airports

In groups, learners are guided to:
- Use infrared thermometer to measure temperature of different surfaces
- Discuss the distance-to-spot ratio in infrared thermometers
- Identify parts of bimetallic thermometer

Why are infrared thermometers preferred for contactless temperature measurement?

- Spotlight Physics Learner's Book pg. 60
- Infrared thermometer
- Bimetallic thermometer
- Various surfaces
- Spotlight Physics Learner's Book pg. 64
- Ball and ring apparatus
- Heat source
- Safety equipment

- Practical assessment - Oral questions - Written tests

Mechanics and Thermal Physics

Temperature and Thermal Expansion - Linear expansivity

By the end of the lesson, the learner should be able to:

- Define linear expansivity
- Calculate change in length using the linear expansion formula
- Relate linear expansivity to expansion gaps in railway tracks and bridges

In groups, learners are guided to:
- Measure initial and final lengths of heated metal rods
- Calculate linear expansivity from experimental data
- Apply the formula ΔL = αL₀Δθ to solve problems

How does the type of material affect its expansion?

- Spotlight Physics Learner's Book pg. 65
- Metal rods (iron, copper, aluminium)
- Heat source
- Ruler/measuring tape

- Written tests - Practical assessment - Problem-solving exercises

Mechanics and Thermal Physics

Temperature and Thermal Expansion - Expansion in liquids

By the end of the lesson, the learner should be able to:

- Demonstrate thermal expansion in liquids
- Explain why the liquid level first falls then rises when heated
- Connect liquid expansion to the working of liquid-in-glass thermometers

In groups, learners are guided to:
- Set up apparatus with flask, tube and coloured water
- Heat the flask and observe liquid level changes
- Discuss why flask expands before liquid

Why does the liquid level initially fall before rising when heated?

- Spotlight Physics Learner's Book pg. 67
- Round-bottomed flask
- Narrow tube with cork
- Coloured water
- Heat source

- Practical assessment - Observation - Oral questions

Mechanics and Thermal Physics

Temperature and Thermal Expansion - Anomalous expansion of water

By the end of the lesson, the learner should be able to:

- Explain the anomalous expansion of water between 0°C and 4°C
- Describe why ice floats on water
- Connect anomalous expansion to survival of aquatic life in frozen lakes during winter

In groups, learners are guided to:
- Use digital resources to research anomalous expansion of water
- Discuss the density-temperature graph of water
- Explain formation of ice on water surfaces

Why does ice float on water?

- Spotlight Physics Learner's Book pg. 68
- Digital resources
- Charts showing density vs temperature
- Reference books

- Oral questions - Written assignments - Group discussions

Mechanics and Thermal Physics

Temperature and Thermal Expansion - Applications in daily life

By the end of the lesson, the learner should be able to:

- Describe applications of thermal expansion in bridges and railways
- Explain the working of bimetallic strips in thermostats
- Connect thermal expansion to car indicator systems, electric kettles and fire alarms

In groups, learners are guided to:
- Discuss expansion joints in bridges and railways
- Explain working of bimetallic strip in thermostats
- Use digital resources to search for applications of thermal expansion

How do engineers account for thermal expansion in construction?

- Spotlight Physics Learner's Book pg. 71
- Pictures of expansion joints
- Bimetallic strip
- Digital resources

- Written tests - Oral questions - Project work

Mechanics and Thermal Physics

Moments and Equilibrium - Centre of gravity of regular objects

By the end of the lesson, the learner should be able to:

- Define centre of gravity
- Determine the C.O.G of regular shaped objects (square, rectangle, circle)
- Relate centre of gravity to balancing objects on fingertips

In groups, learners are guided to:
- Use balancing method to find C.O.G of regular cut-outs
- Use geometrical construction (diagonals) to locate C.O.G
- Compare results from both methods

Where is the centre of gravity of a square located?

- Spotlight Physics Learner's Book pg. 78
- Cut-out shapes (square, rectangle, circle)
- Pencil for balancing
- Ruler

- Practical assessment - Observation - Oral questions

Mechanics and Thermal Physics

Moments and Equilibrium - Centre of gravity of triangles

By the end of the lesson, the learner should be able to:

- Determine C.O.G of triangular objects using medians
- Locate C.O.G at intersection of medians
- Apply knowledge of C.O.G to understanding stability of triangular structures

In groups, learners are guided to:
- Cut out triangular shapes from cardboard
- Construct medians and mark intersection point
- Verify C.O.G by balancing on pencil tip

How do we find the centre of gravity of a triangle?

- Spotlight Physics Learner's Book pg. 80
- Triangular cut-outs
- Ruler
- Pencil
- Marker

- Practical assessment - Written questions - Observation

Mechanics and Thermal Physics

Moments and Equilibrium - Centre of gravity of irregular objects
Moments and Equilibrium - Stable equilibrium

By the end of the lesson, the learner should be able to:

- Determine C.O.G of irregular objects using plumb line method
- Explain why suspended objects align with C.O.G below pivot
- Connect plumb line method to levelling tools used in construction

In groups, learners are guided to:
- Suspend irregular lamina from different points
- Use plumb line to draw vertical lines
- Mark intersection as C.O.G and verify by balancing

Why do all vertical lines through suspension points meet at one point?

- Spotlight Physics Learner's Book pg. 81
- Irregular cardboard shapes
- String and small weight (plumb line)
- Stand and clamp
- Marker
- Spotlight Physics Learner's Book pg. 83
- Cone-shaped objects
- Flat surface

- Practical assessment - Observation - Written tests

Mechanics and Thermal Physics

Moments and Equilibrium - Unstable and neutral equilibrium

By the end of the lesson, the learner should be able to:

- Demonstrate unstable equilibrium using cone on its tip
- Demonstrate neutral equilibrium using cone on its side
- Connect equilibrium states to why loaded trucks are more stable than empty ones

In groups, learners are guided to:
- Balance cone on tip and observe behavior when pushed
- Place cone on its side and push slightly
- Compare all three states of equilibrium

Why does a cone on its tip topple when slightly pushed?

- Spotlight Physics Learner's Book pg. 84
- Cone-shaped objects
- Spherical ball
- Flat surface

- Practical assessment - Observation - Written questions

Mechanics and Thermal Physics

Moments and Equilibrium - Factors affecting stability
Moments and Equilibrium - Turning effect of a force

By the end of the lesson, the learner should be able to:

- Investigate effect of base area on stability
- Investigate effect of position of C.O.G on stability
- Connect stability factors to why buses have luggage compartments underneath

In groups, learners are guided to:
- Compare stability of bottles with different amounts of sand
- Compare stability of books resting on different surfaces
- Discuss how to increase stability of objects

How does the position of centre of gravity affect stability?

- Spotlight Physics Learner's Book pg. 85
- Plastic bottles
- Sand
- Similar books
- Spotlight Physics Learner's Book pg. 89
- Door
- Spring balance
- Ruler

- Practical assessment - Oral questions - Written tests

Mechanics and Thermal Physics

Moments and Equilibrium - Calculating moments

By the end of the lesson, the learner should be able to:

- Calculate moment of a force using Moment = Force × perpendicular distance
- State the SI unit of moment
- Apply moment calculations to using spanners to loosen tight bolts

In groups, learners are guided to:
- Apply forces at different distances from pivot
- Calculate moments from experimental data
- Solve numerical problems on moments

How does increasing distance from pivot affect the turning effect?

- Spotlight Physics Learner's Book pg. 90
- Ruler on pivot
- Spring balance
- Known weights
- Metre rule

- Written tests - Problem-solving exercises - Practical assessment

Mechanics and Thermal Physics

Moments and Equilibrium - Verifying principle of moments

By the end of the lesson, the learner should be able to:

- State the principle of moments
- Verify principle of moments experimentally
- Connect principle of moments to balancing on see-saws

In groups, learners are guided to:
- Set up metre rule on pivot with weights on both sides
- Adjust positions until balanced
- Calculate and compare clockwise and anticlockwise moments

When is a body in rotational equilibrium?

- Spotlight Physics Learner's Book pg. 91
- Metre rule
- Knife edge pivot
- Known masses
- String

- Practical assessment - Written tests - Observation

Mechanics and Thermal Physics

Moments and Equilibrium - Applications of principle of moments

By the end of the lesson, the learner should be able to:

- Apply principle of moments to solve problems
- Determine unknown forces using principle of moments
- Use principle of moments to calculate where children should sit on a see-saw to balance

In groups, learners are guided to:
- Solve problems involving balanced beams
- Calculate unknown masses and distances
- Discuss applications in beam balances and levers

How can we use moments to find an unknown mass?

- Spotlight Physics Learner's Book pg. 92
- Scientific calculators
- Problem sheets
- Beam balance

- Written tests - Problem-solving exercises - Oral questions

Mechanics and Thermal Physics

Moments and Equilibrium - Determining mass using moments

By the end of the lesson, the learner should be able to:

- Determine mass of a metre rule using principle of moments
- Locate C.O.G of a metre rule experimentally
- Apply the method to weighing objects using simple beam balances

In groups, learners are guided to:
- Suspend metre rule and find balance point
- Use known mass to determine mass of rule
- Apply principle of moments in calculations

How can we determine the mass of a ruler using moments?

- Spotlight Physics Learner's Book pg. 93
- Metre rule
- Stand and thread
- Known masses (50g, 100g)

- Practical assessment - Written tests - Problem-solving

Mechanics and Thermal Physics

Moments and Equilibrium - Parallel forces and two supports

By the end of the lesson, the learner should be able to:

- Demonstrate moments about two points of support
- Apply conditions for equilibrium with parallel forces
- Connect parallel forces to how bridges distribute weight across supports

In groups, learners are guided to:
- Set up metre rule supported by two spring balances
- Attach weights at different positions
- Verify sum of upward forces equals sum of downward forces

How are forces distributed in a beam supported at two points?

- Spotlight Physics Learner's Book pg. 94
- Metre rule
- Two spring balances
- Known weights
- Stand

- Practical assessment - Written tests - Observation

Mechanics and Thermal Physics

Moments and Equilibrium - Couple and torque

By the end of the lesson, the learner should be able to:

- Define a couple as two equal and opposite parallel forces
- Calculate torque as Force × perpendicular distance between forces
- Connect couples to turning steering wheels and opening bottle caps

In groups, learners are guided to:
- Demonstrate couple using a plank fixed at centre
- Apply equal forces in opposite directions
- Calculate torque from experimental data

Why do we need two hands to turn a steering wheel smoothly?

- Spotlight Physics Learner's Book pg. 97
- Uniform plank with central pivot
- Spring balances
- Steering wheel model

- Practical assessment - Written tests - Oral questions

Mechanics and Thermal Physics

Moments and Equilibrium - Applications and resolution of forces

By the end of the lesson, the learner should be able to:

- Describe applications of torque and couples
- Resolve forces to find perpendicular components
- Apply moments to real-life situations like using spanners, screwdrivers and bicycle pedalling

In groups, learners are guided to:
- Discuss applications of moments in daily life
- Solve problems involving forces at angles
- Calculate moments when force is not perpendicular

How do we calculate moments when force is applied at an angle?

- Spotlight Physics Learner's Book pg. 100
- Pictures of applications
- Digital resources
- Problem sheets

- Written tests - Oral questions - Project presentations

Mechanics and Thermal Physics

Moments and Equilibrium - Applications and resolution of forces

By the end of the lesson, the learner should be able to:

- Describe applications of torque and couples
- Resolve forces to find perpendicular components
- Apply moments to real-life situations like using spanners, screwdrivers and bicycle pedalling

In groups, learners are guided to:
- Discuss applications of moments in daily life
- Solve problems involving forces at angles
- Calculate moments when force is not perpendicular

How do we calculate moments when force is applied at an angle?

- Spotlight Physics Learner's Book pg. 100
- Pictures of applications
- Digital resources
- Problem sheets

- Written tests - Oral questions - Project presentations

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Definition of work
Energy, Work, Power and Machines - Calculating work done

By the end of the lesson, the learner should be able to:

- Define work as product of force and displacement
- State the SI unit of work as joule
- Differentiate between work done and no work done like pushing a wall versus pushing a wheelbarrow

In groups, learners are guided to:
- Discuss scenarios where work is done and not done
- Calculate work done in lifting and pushing objects
- Relate work to force and displacement

When do we say work is done in Physics?

- Spotlight Physics Learner's Book pg. 105
- Spring balance
- Metre rule
- Various objects
- Spotlight Physics Learner's Book pg. 107
- Known masses
- Stopwatch

- Oral questions - Written tests - Observation

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Energy and its forms
Energy, Work, Power and Machines - Definition and calculation of power

By the end of the lesson, the learner should be able to:

- Define energy as ability to do work
- Identify different forms of energy
- Connect energy forms to household appliances like heaters, bulbs and motors

In groups, learners are guided to:
- Move objects and discuss energy expended
- Identify forms of energy in various situations
- Discuss energy sources and their uses

What enables us to do work?

- Spotlight Physics Learner's Book pg. 108
- Various objects
- Pictures of energy sources
- Digital resources
- Stopwatch
- Spring balance
- Known masses
- Calculators

- Oral questions - Written assignments - Group discussions

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Kinetic energy

By the end of the lesson, the learner should be able to:

- Define kinetic energy as energy due to motion
- Calculate kinetic energy using KE = ½mv²
- Connect kinetic energy to moving vehicles, athletes and flowing water

In groups, learners are guided to:
- Roll toy car down ramp and calculate its kinetic energy
- Investigate how mass and velocity affect K.E
- Solve problems on kinetic energy

How does speed affect the kinetic energy of a moving object?

- Spotlight Physics Learner's Book pg. 112
- Toy car
- Ramp
- Stopwatch
- Measuring tape
- Beam balance

- Practical assessment - Written tests - Problem-solving

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Gravitational potential energy
Energy, Work, Power and Machines - Elastic potential energy

By the end of the lesson, the learner should be able to:

- Define gravitational potential energy
- Calculate P.E using PE = mgh
- Connect potential energy to water stored in elevated tanks and dams for hydropower

In groups, learners are guided to:
- Lift objects to different heights and calculate P.E
- Investigate effect of mass and height on P.E
- Solve numerical problems on potential energy

How does height affect the potential energy of an object?

- Spotlight Physics Learner's Book pg. 114
- Small weights
- Metre rule
- Beam balance
- Stand
- Spotlight Physics Learner's Book pg. 116
- Rubber bands
- Springs
- Small objects
- Paper balls

- Practical assessment - Written tests - Problem-solving

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Conservation of mechanical energy

By the end of the lesson, the learner should be able to:

- State the law of conservation of energy
- Demonstrate energy transformation using a pendulum
- Connect energy conservation to swings in playgrounds and roller coasters

In groups, learners are guided to:
- Set up simple pendulum and observe energy changes
- Identify P.E and K.E at different positions
- Verify total mechanical energy is constant

What happens to energy as a pendulum swings?

- Spotlight Physics Learner's Book pg. 118
- Pendulum bob
- String
- Stand
- Metre rule

- Practical assessment - Oral questions - Written tests

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Energy transformations

By the end of the lesson, the learner should be able to:

- Describe energy transformations in various systems
- Apply conservation of energy to solve problems
- Connect energy transformations to motor vehicles, power stations and home appliances

In groups, learners are guided to:
- Discuss energy changes in falling objects, vehicles, and appliances
- Visit a garage to observe energy transformations in vehicles
- Solve problems using conservation of energy

How is energy transformed in a moving vehicle?

- Spotlight Physics Learner's Book pg. 121
- Digital resources
- Pictures of machines
- Reference books

- Written tests - Oral questions - Project work

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Types of simple machines

By the end of the lesson, the learner should be able to:

- Identify types of simple machines
- Describe applications of levers, pulleys and inclined planes
- Connect simple machines to everyday tools like scissors, wheelbarrows and ramps

In groups, learners are guided to:
- Use digital resources to search for types of simple machines
- Identify simple machines in the environment
- Classify levers into first, second and third class

How do simple machines make work easier?

- Spotlight Physics Learner's Book pg. 124
- Pictures of simple machines
- Examples of levers
- Inclined plane model

- Oral questions - Written assignments - Observation

Mechanics and Thermal Physics

Energy, Work, Power and Machines - MA, VR and efficiency

By the end of the lesson, the learner should be able to:

- Define mechanical advantage, velocity ratio and efficiency
- Calculate MA, VR and efficiency of machines
- Explain why efficiency is always less than 100% due to friction in real machines

In groups, learners are guided to:
- Discuss meaning of MA, VR and efficiency
- Calculate MA and VR from experimental data
- Relate efficiency to energy losses

Why is the efficiency of machines always less than 100%?

- Spotlight Physics Learner's Book pg. 129
- Simple machines
- Spring balance
- Known masses
- Metre rule

- Written tests - Problem-solving - Practical assessment

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Levers

By the end of the lesson, the learner should be able to:

- Calculate MA and VR of levers
- Apply principle of moments to levers
- Relate lever calculations to using crowbars, scissors and wheelbarrows

In groups, learners are guided to:
- Set up different classes of levers
- Calculate MA and VR experimentally
- Solve problems on levers

How does the position of the fulcrum affect the mechanical advantage of a lever?

- Spotlight Physics Learner's Book pg. 131
- Lever apparatus
- Known masses
- Spring balance
- Metre rule

- Practical assessment - Written tests - Problem-solving

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Levers

By the end of the lesson, the learner should be able to:

- Calculate MA and VR of levers
- Apply principle of moments to levers
- Relate lever calculations to using crowbars, scissors and wheelbarrows

In groups, learners are guided to:
- Set up different classes of levers
- Calculate MA and VR experimentally
- Solve problems on levers

How does the position of the fulcrum affect the mechanical advantage of a lever?

- Spotlight Physics Learner's Book pg. 131
- Lever apparatus
- Known masses
- Spring balance
- Metre rule

- Practical assessment - Written tests - Problem-solving

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Pulleys

By the end of the lesson, the learner should be able to:

- Calculate VR of pulley systems
- Investigate efficiency of pulley systems
- Connect pulley systems to cranes, flagpoles and construction hoists

In groups, learners are guided to:
- Set up single fixed and movable pulleys
- Set up block and tackle system
- Calculate MA, VR and efficiency experimentally

How does the number of pulleys affect the velocity ratio?

- Spotlight Physics Learner's Book pg. 131
- Pulleys
- String
- Known masses
- Spring balance
- Stand

- Practical assessment - Written tests - Observation

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Inclined plane and screw

By the end of the lesson, the learner should be able to:

- Calculate VR of inclined plane as length/height
- Calculate VR of screw using pitch and circumference
- Connect inclined planes to loading ramps and wheelchair access, and screws to car jacks

In groups, learners are guided to:
- Roll objects up inclined plane at different angles
- Calculate VR of inclined plane
- Discuss relationship between screw and inclined plane

How does the angle of inclination affect the effort required?

- Spotlight Physics Learner's Book pg. 134
- Inclined plane
- Screw jack
- Spring balance
- Metre rule

- Practical assessment - Written tests - Problem-solving

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Wheel and axle, gears

By the end of the lesson, the learner should be able to:

- Calculate VR of wheel and axle
- Calculate VR of gear systems
- Connect wheel and axle to steering wheels and door knobs, and gears to bicycles and car gearboxes

In groups, learners are guided to:
- Demonstrate wheel and axle operation
- Calculate VR of gear systems with different teeth
- Solve problems on wheel and axle and gears

How do gears change speed and force?

- Spotlight Physics Learner's Book pg. 137
- Wheel and axle model
- Gear wheels
- Bicycle

- Practical assessment - Written tests - Oral questions

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Hydraulic machines and applications

By the end of the lesson, the learner should be able to:

- Explain working principle of hydraulic machines
- Calculate force multiplication in hydraulic systems
- Connect hydraulic machines to car brakes, car jacks and construction equipment

In groups, learners are guided to:
- Construct simple hydraulic system using syringes
- Calculate force and VR of hydraulic press
- Discuss applications in vehicles and construction
- Identify simple machines in treadmills, elevators and escalators

How do hydraulic machines multiply force?

- Spotlight Physics Learner's Book pg. 139
- Syringes of different sizes
- Tubing
- Water
- Pictures of hydraulic machines

- Practical assessment - Written tests - Project presentations

Waves and Optics

Properties of Waves - Rectilinear propagation of waves

By the end of the lesson, the learner should be able to:

- Explain the meaning of rectilinear propagation of waves
- Demonstrate rectilinear propagation using sound and light examples
- Relate wave propagation to everyday experiences like torch beams and speaker systems

In groups, learners are guided to:

- Discuss with peers the meaning of rectilinear propagation of waves
- Observe how sound travels from a teacher facing different directions
- Use digital resources to search for applications of rectilinear propagation

How do waves travel from their source?

- Spotlight Physics Grade 10 pg. 147
- Torch
- Digital resources

- Oral questions - Observation - Written assignments

Waves and Optics

Properties of Waves - Reflection of waves

By the end of the lesson, the learner should be able to:

- Explain the meaning of reflection of waves
- Demonstrate reflection of sound waves using a tall building scenario
- Connect reflection to real-life applications like radar systems and car side mirrors

In groups, learners are guided to:

- Discuss how sound waves bounce off hard surfaces
- Identify applications of reflection in radar, mirrors, and fibre optics
- Use print or non-print media to research reflection applications

Why do we hear echoes near tall buildings?

- Spotlight Physics Grade 10 pg. 148
- Digital resources
- Charts showing reflection

- Oral questions - Observation - Group presentations

Waves and Optics

Properties of Waves - Refraction of waves
Properties of Waves - Diffraction of waves

By the end of the lesson, the learner should be able to:

- Explain the meaning of refraction of waves
- Demonstrate refraction using a straight object in water
- Relate refraction to why sound travels differently during day and night

In groups, learners are guided to:

- Observe how a straight object appears bent when placed in water
- Discuss how sound waves bend at the interface of cold and hot air
- Illustrate refraction of sound waves during day and night

Why does a stick appear bent in water?

- Spotlight Physics Grade 10 pg. 150
- Glass of water
- Straight object
- Digital resources
- Spotlight Physics Grade 10 pg. 151
- Torch
- Manila paper

- Observation - Oral questions - Written tests

Waves and Optics

Properties of Waves - Interference of waves

By the end of the lesson, the learner should be able to:

- Explain the meaning of interference of waves
- Demonstrate constructive and destructive interference using two speakers
- Relate interference to hearing loud and quiet zones in concert halls

In groups, learners are guided to:

- Set up two identical speakers connected to the same audio frequency generator
- Walk along a line perpendicular to the speakers and observe loud and quiet areas
- Discuss constructive and destructive interference patterns

Why do we hear areas of loud and soft sound when two speakers play together?

- Spotlight Physics Grade 10 pg. 152
- Two identical speakers
- Audio frequency generator
- Digital resources

- Observation - Oral questions - Written assignments

Waves and Optics

Properties of Waves - Demonstrating rectilinear propagation using ripple tank
Properties of Waves - Demonstrating reflection using ripple tank

By the end of the lesson, the learner should be able to:

- Set up a ripple tank to demonstrate wave properties
- Demonstrate rectilinear propagation of waves in a ripple tank
- Connect the formation of bright and dark spots to how water waves behave

In groups, learners are guided to:

- Set up a ripple tank with all accessories
- Observe how crests appear bright and troughs appear dark
- Place two straight rods perpendicular to the vibrating bar and observe wave direction

How do waves move in a straight line?

- Spotlight Physics Grade 10 pg. 154
- Ripple tank and accessories
- Dry cell and cell holder
- White manila paper
- Spotlight Physics Grade 10 pg. 156
- Ripple tank
- Straight metal reflector
- Concave and convex reflectors

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Demonstrating refraction using ripple tank
Properties of Waves - Demonstrating diffraction using ripple tank

By the end of the lesson, the learner should be able to:

- Demonstrate refraction of waves using a ripple tank
- Observe changes in wavelength as waves move from deep to shallow water
- Connect wave refraction to how light bends when entering water

In groups, learners are guided to:

- Create a shallow region in the ripple tank using a transparent glass plate
- Produce straight plane waves and observe separation of ripples
- Tilt the glass plate at an acute angle and observe wave bending

Why does the wavelength change when waves move from deep to shallow water?

- Spotlight Physics Grade 10 pg. 158
- Ripple tank
- Transparent glass plate
- White manila paper
- Spotlight Physics Grade 10 pg. 159
- Two straight metal barriers
- Opaque obstacle

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Demonstrating interference using ripple tank

By the end of the lesson, the learner should be able to:

- Demonstrate interference of waves using a ripple tank
- Identify constructive and destructive interference patterns
- Relate interference patterns to noise-cancelling headphones and acoustic design

In groups, learners are guided to:

- Fix two spherical balls below the vibrator bar as coherent sources
- Observe dark and bright radial lines showing interference pattern
- Discuss how bright lines show constructive and dark lines show destructive interference

How are interference patterns formed in a ripple tank?

- Spotlight Physics Grade 10 pg. 160
- Ripple tank
- Two spherical balls
- White manila paper

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Demonstrating interference using ripple tank

By the end of the lesson, the learner should be able to:

- Demonstrate interference of waves using a ripple tank
- Identify constructive and destructive interference patterns
- Relate interference patterns to noise-cancelling headphones and acoustic design

In groups, learners are guided to:

- Fix two spherical balls below the vibrator bar as coherent sources
- Observe dark and bright radial lines showing interference pattern
- Discuss how bright lines show constructive and dark lines show destructive interference

How are interference patterns formed in a ripple tank?

- Spotlight Physics Grade 10 pg. 160
- Ripple tank
- Two spherical balls
- White manila paper

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Production of frequency modulated (FM) waves

By the end of the lesson, the learner should be able to:

- Explain the meaning of frequency modulation
- Describe methods of producing FM waves
- Connect FM to how radio stations broadcast music and news

In groups, learners are guided to:

- Use digital devices to research the meaning of FM and its production
- Discuss the difference between FM and AM
- Search for applications of frequency modulation

How are FM radio signals produced?

- Spotlight Physics Grade 10 pg. 161
- Digital resources
- Physics reference books

- Oral questions - Written assignments - Group presentations