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
Moments and Equilibrium - Verifying principle of moments
Moments and Equilibrium - Applications of principle of 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

- 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:
- Apply forces at different distances from pivot
- Calculate moments from experimental data
- Solve numerical problems on moments
- Solve problems involving balanced beams
- Calculate unknown masses and distances
- Discuss applications in beam balances and levers

How does increasing distance from pivot affect the turning effect?
How can we use moments to find an unknown mass?

- Spotlight Physics Learner's Book pg. 90
- Ruler on pivot
- Spring balance
- Known weights
- Metre rule
- Spotlight Physics Learner's Book pg. 91
- Metre rule
- Knife edge pivot
- Known masses
- String
- Spotlight Physics Learner's Book pg. 92
- Scientific calculators
- Problem sheets
- Beam balance

- Written tests - Problem-solving exercises - Practical assessment
- Written tests - Problem-solving exercises - Oral questions

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

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

- 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:
- Discuss scenarios where work is done and not done
- Calculate work done in lifting and pushing objects
- Relate work to force and displacement
- Move objects and discuss energy expended
- Identify forms of energy in various situations
- Discuss energy sources and their uses

When do we say work is done in Physics?
What enables us to do work?

- Spotlight Physics Learner's Book pg. 105
- Spring balance
- Metre rule
- Various objects
- Spotlight Physics Learner's Book pg. 107
- Known masses
- Stopwatch
- Spotlight Physics Learner's Book pg. 108
- Various objects
- Pictures of energy sources
- Digital resources
- Stopwatch
- Spring balance
- Known masses
- Calculators

- Oral questions - Written tests - Observation
- Oral questions - Written assignments - Group discussions

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Kinetic energy
Energy, Work, Power and Machines - Gravitational potential 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
- Spotlight Physics Learner's Book pg. 114
- Small weights
- Metre rule
- Beam balance
- Stand

- Practical assessment - Written tests - Problem-solving

Mechanics and Thermal Physics

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

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

- Define elastic potential energy
- Demonstrate elastic P.E in stretched materials
- Connect elastic potential energy to catapults, bow and arrow, and car shock absorbers

In groups, learners are guided to:
- Stretch rubber bands and release to propel objects
- Investigate elastic P.E in springs
- Calculate elastic P.E using area under F-e graph

How do stretched materials store energy?

- Spotlight Physics Learner's Book pg. 116
- Rubber bands
- Springs
- Small objects
- Paper balls
- Spotlight Physics Learner's Book pg. 118
- Pendulum bob
- String
- Stand
- Metre rule

- Practical assessment - Observation - Written questions

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

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

- 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:
- Use digital resources to search for types of simple machines
- Identify simple machines in the environment
- Classify levers into first, second and third class
- Discuss meaning of MA, VR and efficiency
- Calculate MA and VR from experimental data
- Relate efficiency to energy losses

How do simple machines make work easier?
Why is the efficiency of machines always less than 100%?

- Spotlight Physics Learner's Book pg. 124
- Pictures of simple machines
- Examples of levers
- Inclined plane model
- Spotlight Physics Learner's Book pg. 129
- Simple machines
- Spring balance
- Known masses
- Metre rule

- Oral questions - Written assignments - Observation
- 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 - 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
Energy, Work, Power and Machines - Hydraulic machines and applications

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

- 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:
- Demonstrate wheel and axle operation
- Calculate VR of gear systems with different teeth
- Solve problems on wheel and axle and gears
- 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 gears change speed and force?
How do hydraulic machines multiply force?

- Spotlight Physics Learner's Book pg. 137
- Wheel and axle model
- Gear wheels
- Bicycle
- Spotlight Physics Learner's Book pg. 139
- Syringes of different sizes
- Tubing
- Water
- Pictures of hydraulic machines

- Practical assessment - Written tests - Oral questions
- Practical assessment - Written tests - Project presentations

Waves and Optics

Properties of Waves - Rectilinear propagation of waves
Properties of Waves - Reflection 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
- Spotlight Physics Grade 10 pg. 148
- Digital resources
- Charts showing reflection

- Oral questions - Observation - Written assignments

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
Properties of Waves - Demonstrating rectilinear propagation using ripple tank

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
- Spotlight Physics Grade 10 pg. 154
- Ripple tank and accessories
- Dry cell and cell holder
- White manila paper

- Observation - Oral questions - Written assignments

Waves and Optics

Properties of Waves - Demonstrating reflection using ripple tank
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 reflection of waves using a ripple tank
- Illustrate reflection patterns with different reflector shapes
- Relate reflection patterns to how car headlamps and satellite dishes work

- Demonstrate diffraction of waves using a ripple tank
- Investigate how aperture size affects diffraction
- Connect diffraction to how radio waves reach behind buildings

In groups, learners are guided to:

- Place a straight reflector perpendicular to plane waves and observe
- Place the reflector at an acute angle and record observations
- Use concave and convex reflectors to observe different reflection patterns

- Place two metal barriers with an aperture in front of plane waves
- Vary the aperture size from 8 cm to 0.5 cm and observe emerging waves
- Place an obstacle in front of waves and observe diffraction around it

How do waves behave when they hit different shaped surfaces?
What factors determine the extent of wave diffraction?

- Spotlight Physics Grade 10 pg. 156
- Ripple tank
- Straight metal reflector
- Concave and convex reflectors
- Spotlight Physics Grade 10 pg. 158
- Transparent glass plate
- White manila paper

- Spotlight Physics Grade 10 pg. 159
- Ripple tank
- Two straight metal barriers
- Opaque obstacle

- Practical assessment - Observation - Written tests
- Practical assessment - Observation - Written assignments

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

Waves and Optics

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

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

- Explain how FM waves are detected and demodulated
- Describe applications of FM in various fields
- Relate FM detection to how radios and television sets receive signals

In groups, learners are guided to:

- Discuss demodulation methods for FM signals
- Research applications of FM in radar systems, medical imaging, and telemetry
- Present findings on FM applications to classmates

How do radios detect and convert FM signals to sound?

- Spotlight Physics Grade 10 pg. 162
- Digital resources
- Radio receiver (demonstration)

- Oral questions - Written tests - Research presentations

Waves and Optics

Properties of Waves - Formation of stationary waves
Properties of Waves - Factors affecting fundamental frequency of vibrating string

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

- Explain the meaning of stationary waves
- Demonstrate formation of stationary waves using a tuning fork and string
- Connect stationary waves to how guitar strings produce different notes

- Investigate factors affecting fundamental frequency of a vibrating string
- Determine the relationship between frequency, tension, and length
- Relate findings to tuning musical instruments like guitars and violins

In groups, learners are guided to:

- Fix a string to a tuning fork prong and pass over a fixed pulley
- Strike the tuning fork and observe nodes and antinodes
- Discuss how incident and reflected waves superimpose to form stationary waves

- Set up a sonometer apparatus and vary tension while keeping length constant
- Vary the length between bridges while keeping tension constant
- Discuss the mathematical relationship f = (1/2L)√(T/μ)

How are stationary waves formed in a vibrating string?
How do tension and length affect the frequency of a vibrating string?

- Spotlight Physics Grade 10 pg. 163
- Tuning fork
- String
- Mass (weight)
- Fixed pulley system

- Spotlight Physics Grade 10 pg. 164
- Sonometer apparatus
- Weights
- Two wooden wedges

- Practical assessment - Observation - Oral questions
- Practical assessment - Written tests - Oral questions

Waves and Optics

Properties of Waves - Modes of vibration in strings

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

- Explain modes of vibration in strings
- Calculate frequencies of harmonics and overtones
- Connect harmonics to the rich sound quality of musical instruments

In groups, learners are guided to:

- Discuss fundamental frequency and how it relates to wavelength
- Calculate first and second overtones using mathematical relationships
- Use the general formula for nth overtone: fn = (n+1)f₀

What are harmonics and overtones in vibrating strings?

- Spotlight Physics Grade 10 pg. 166
- Digital resources
- Charts showing modes of vibration

- Written tests - Oral questions - Problem-solving exercises

Waves and Optics

Properties of Waves - Stationary waves in closed pipes

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

- Investigate variation of sound with length of air column in a closed pipe
- Demonstrate resonance in a closed pipe
- Relate closed pipe resonance to how wind instruments like clarinets work

In groups, learners are guided to:

- Dip a glass tube into water and hold a vibrating tuning fork over the open end
- Adjust the tube length until resonance is achieved
- Discuss the relationship between length and wavelength: L = λ/4

How does the length of a closed air column affect the sound produced?

- Spotlight Physics Grade 10 pg. 167
- Glass tube
- Glass jar with water
- Tuning fork

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Harmonics in closed pipes

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

- Explain harmonics in closed pipes
- Calculate frequencies of overtones in closed pipes
- Connect closed pipe harmonics to the limited overtones in some wind instruments

In groups, learners are guided to:

- Discuss the first harmonic (fundamental frequency) in closed pipes
- Calculate second and third harmonics using f = (2n-1)f₀
- Compare harmonic patterns in closed pipes with open pipes

Why do closed pipes only produce odd harmonics?

- Spotlight Physics Grade 10 pg. 168
- Digital resources
- Charts showing harmonics

- Written tests - Problem-solving exercises - Oral questions

Waves and Optics

Properties of Waves - Stationary waves in open pipes
Properties of Waves - Meaning of Doppler effect

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

- Explain stationary wave formation in open pipes
- Calculate fundamental frequency and overtones in open pipes
- Relate open pipe resonance to how flutes and organ pipes produce sound

- Explain the meaning of Doppler effect
- Describe how sound frequency changes with relative motion
- Connect Doppler effect to the changing pitch of an ambulance siren

In groups, learners are guided to:

- Discuss how antinodes form at both ends of an open pipe
- Calculate wavelength and frequency relationships: L = λ/2
- Compare fundamental frequencies in open and closed pipes

- Discuss the scenario of a blind man detecting vehicle movement by sound
- Explain why the pitch of a siren increases when approaching and decreases when receding
- Research the discovery of Doppler effect by Christian Doppler

How do stationary waves form in open pipes?
Why does the pitch of a siren change as an ambulance passes by?

- Spotlight Physics Grade 10 pg. 169
- Digital resources
- Charts showing open pipe harmonics

- Spotlight Physics Grade 10 pg. 173
- Digital resources
- Audio recordings of approaching vehicles

- Written tests - Oral questions - Problem-solving exercises
- Oral questions - Observation - Written assignments

Waves and Optics

Properties of Waves - Demonstrating Doppler effect

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

- Demonstrate Doppler effect using sound sources and ropes
- Observe changes in wavelength when source moves towards or away from observer
- Relate the demonstration to how radar speed guns measure vehicle speed

In groups, learners are guided to:

- Move an audio frequency generator towards and away from a stationary observer
- Use a rope to show compression and stretching of waves
- Discuss how wavelength decreases when source approaches and increases when receding

How does the movement of a sound source affect the waves detected by an observer?

- Spotlight Physics Grade 10 pg. 174
- Audio frequency generator
- Rope or spiral spring

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Applications of Doppler effect

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

- Describe applications of Doppler effect in various fields
- Explain how Doppler effect is used in astronomy, medicine, and traffic control
- Connect Doppler applications to ultrasound scans and weather forecasting

In groups, learners are guided to:

- Research applications in astronomy for measuring galaxy movements
- Discuss medical imaging applications like Doppler sonography
- Explore traffic radar and speed camera applications

How is Doppler effect used in medicine and traffic control?

- Spotlight Physics Grade 10 pg. 175
- Digital resources
- Charts showing Doppler applications

- Research presentations - Written tests - Oral questions