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Physics
Form 3 2026
TERM III
School


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WK LSN TOPIC SUB-TOPIC OBJECTIVES T/L ACTIVITIES T/L AIDS REFERENCE REMARKS
2 1
Refraction Of Light
The meaning of refraction
By the end of the lesson, the learner should be able to:


Describe simple experiments to illustrate refraction of light
In groups, learners are guided to:

Experiments demonstrating refraction of light

Beakers
Water
Stick or glass rod
Basins
Coins
Glass blocks
Pin
Comprehensive secondary physics students book 3 pages 11-12
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 41-46
2 2
Refraction Of Light
The meaning of refraction
By the end of the lesson, the learner should be able to:


Describe simple experiments to illustrate refraction of light
In groups, learners are guided to:

Experiments demonstrating refraction of light

Beakers
Water
Stick or glass rod
Basins
Coins
Glass blocks
Pin
Comprehensive secondary physics students book 3 pages 11-12
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 41-46
2 3-4
Refraction Of Light
Laws of refraction
Refractive index
By the end of the lesson, the learner should be able to:


State the laws of refraction and define refractive index


Determine the refractive index of a given substance
In groups, learners are guided to:

Discovering Snell?s law of refraction through experiments
Defining refractive index
Stating the laws of refraction

Experiments to determine the refractive index of rates and glass by real and apparent depth method

Glass blocks
Pins
Soft board
Plain paper
Geometric set

Water
Pins
Plain papers
Coins
Beakers
Comprehensive secondary physics students book 3 pages 12-14
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 47-61 
Comprehensive secondary physics students book 3 pages 14-15
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 61-68
2 5
Refraction Of Light
Refractive index
By the end of the lesson, the learner should be able to:


Determine the refractive index of a given substance
In groups, learners are guided to:

Experiments to determine the refractive index of rates and glass by real and apparent depth method

Water
Pins
Plain papers
Coins
Beakers
Comprehensive secondary physics students book 3 pages 14-15
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 61-68
3 1
Refraction Of Light
Application of a total internal reflection in a prism periscope, optical fibre
By the end of the lesson, the learner should be able to:


Explain the working of a prisms and optical fibres among other applications
In groups, learners are guided to:

Making a periscope
Discussion on working of an optical fibre

Charts on total internal reflection and applications
Comprehensive secondary physics students book 3 pages 18-19
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 76-79 
3 2
Refraction Of Light
Application of a total internal reflection in a prism periscope, optical fibre
By the end of the lesson, the learner should be able to:


Explain the working of a prisms and optical fibres among other applications
In groups, learners are guided to:

Making a periscope
Discussion on working of an optical fibre

Charts on total internal reflection and applications
Comprehensive secondary physics students book 3 pages 18-19
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 76-79 
3 3-4
Refraction Of Light
Dispersion of white light and recombination of colors of the spectrum
By the end of the lesson, the learner should be able to:


Describe an experiment to illustrate the dispersion of light
In groups, learners are guided to:

Experiment on dispersion of light using glass prisms

Triangular glass prisms
Source of light
Screen
Comprehensive secondary physics students book 3 pages 19-20
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 79-89
3 5
Refraction Of Light
Problems of refractive index and critical angle
By the end of the lesson, the learner should be able to:


Solve problems involving the refractive index and critical angle
In groups, learners are guided to:

Discussions and problem solving in critical angle using the formulae sin C=i/n and n=sin i/sin r

Review questions
Past exams
Examples in the topic
Comprehensive secondary physics book 3 pages 21-22
Comprehensive secondary physics teachers book 3 pages6-9
Secondary physics KLB students book 3 page 82-86
4 1
Energy, Work, Power And Machines
The law of conservation of energy
By the end of the lesson, the learner should be able to:


State the laws of conservation of energy
Explain the applications of the laws of conservations of energy
In groups, learners are guided to:

Discussion on the law of conservation of energy

Chart on the laws of conservation of energy
Comprehensive secondary physics students book 3 pages 41-42
Comprehensive secondary physics teachers book 3 pages 20-21
Secondary physics KLB students book 3 page 132-134 
4 2
Energy, Work, Power And Machines
The law of conservation of energy
By the end of the lesson, the learner should be able to:


State the laws of conservation of energy
Explain the applications of the laws of conservations of energy
In groups, learners are guided to:

Discussion on the law of conservation of energy

Chart on the laws of conservation of energy
Comprehensive secondary physics students book 3 pages 41-42
Comprehensive secondary physics teachers book 3 pages 20-21
Secondary physics KLB students book 3 page 132-134 
4 3-4
Electrostatics
The Heating Effect Of Electric Current
Application of capacitors
Electric current heating effect
By the end of the lesson, the learner should be able to:


State and explain the applications of capacitors


Perform and describe experiments to illustrate the heating effect of electric current
In groups, learners are guided to:

Discussions on applications of capacitors
Stating and explaining applications of capacitors

Experiments to illustrate heating effect of electric current
Discussions on heating effect of electric current

Charts on the use of capacitors
capacitors

Complete circuit
Water in a beaker
Metallic rod
Thermometer
Comprehensive secondary physics students book 3 pages 82-84
Comprehensive secondary physics teachers book 3 pages 34-39
Secondary physics KLB students book 3 page 244 
Comprehensive secondary physics students book 3 pages 88
Comprehensive secondary physics teachers book 3 pages 39-41
Secondary physics KLB students book 3 page 246-247 
4 5
The Heating Effect Of Electric Current
Electric current heating effect
By the end of the lesson, the learner should be able to:


Perform and describe experiments to illustrate the heating effect of electric current
In groups, learners are guided to:

Experiments to illustrate heating effect of electric current
Discussions on heating effect of electric current

Complete circuit
Water in a beaker
Metallic rod
Thermometer
Comprehensive secondary physics students book 3 pages 88
Comprehensive secondary physics teachers book 3 pages 39-41
Secondary physics KLB students book 3 page 246-247 
5 1
The Heating Effect Of Electric Current
Heating devices fuses
By the end of the lesson, the learner should be able to:


describe the working of electric iron, bulb filament and an electric water
In groups, learners are guided to:

discussion on electric devices
observations and experiments on heating devices

electric irons
electric bulb
electric kettle
electric heater
fuses
Comprehensive secondary physics students book 3 pages 90-91
Comprehensive secondary physics teachers book 3 pages 39-41
Secondary physics KLB students book 3 page 255-258
5 2
The Heating Effect Of Electric Current
Heating devices fuses
By the end of the lesson, the learner should be able to:


describe the working of electric iron, bulb filament and an electric water
In groups, learners are guided to:

discussion on electric devices
observations and experiments on heating devices

electric irons
electric bulb
electric kettle
electric heater
fuses
Comprehensive secondary physics students book 3 pages 90-91
Comprehensive secondary physics teachers book 3 pages 39-41
Secondary physics KLB students book 3 page 255-258
5 3-4
The Heating Effect Of An Electric Current
Factors affecting electric current
By the end of the lesson, the learner should be able to:


State and explain the factors affecting electrical energy
In groups, learners are guided to:

Discussions on the factors affecting electrical energy
Experiments on electrical energy
Stating and explaining factors affecting the electrical energy

Complete circuit
Wires
Rheostat
Ammeter
battery
Comprehensive secondary physics students book 3 pages 88-90
Comprehensive secondary physics teachers book 3 pages 39-41
Secondary physics KLB students book 3 page 247-255 
5 5
Quantity Of Heat
Heat capacity Specific heat capacity Units of heat capacity
By the end of the lesson, the learner should be able to:

By the end of the lesson the learner should be able to
Define heat capacity and specific heat capacity and derive their SI units
In groups, learners are guided to:

Experiments on heat capacity and specific heat capacity
Discussion on heat capacity and specific h eat capacity
Defining heat capacity and heat specific heat capacity

Source of heat
Water
Lagged can
Thermometer
Comprehensive secondary physics students book 3 pages 93-96
Comprehensive secondary physics teachers book 3 pages 42-46
Secondary physics KLB students book 3 page 246-260-271 
6 1
Quantity Of Heat
Change of state
By the end of the lesson, the learner should be able to:

By the end of the lesson the learner should be able to define and explain latent heat of fusion, specific latent heat of fusion
Define and explain latent heat of vaporization, specific latent heat of vaporization
State the SI units of latent heat of fusion and latent heat of vaporization
In groups, learners are guided to:

Experiments on latent heat of fusion and latent heat of vaporization
Discussion on latent heat of fusion and latent heat of vaporization

File
Water
Thermometer
Weighing balance
Source of heat
Comprehensive secondary physics students book 3 pages 96-97
Comprehensive secondary physics teachers book 3 pages 42-46
Secondary physics KLB students book 3 page 246-271-281 
6 2
Quantity Of Heat
Change of state
By the end of the lesson, the learner should be able to:

By the end of the lesson the learner should be able to define and explain latent heat of fusion, specific latent heat of fusion
Define and explain latent heat of vaporization, specific latent heat of vaporization
State the SI units of latent heat of fusion and latent heat of vaporization
In groups, learners are guided to:

Experiments on latent heat of fusion and latent heat of vaporization
Discussion on latent heat of fusion and latent heat of vaporization

File
Water
Thermometer
Weighing balance
Source of heat
Comprehensive secondary physics students book 3 pages 96-97
Comprehensive secondary physics teachers book 3 pages 42-46
Secondary physics KLB students book 3 page 246-271-281 
6 3-4
Quantity Of Heat
The Gas Laws
Boiling and melting
Pressure law
By the end of the lesson, the learner should be able to:


Distinguish between boiling and melting
State the factors affecting melting points and boiling points of a substance
Describe the working of a pressure cooker and a refrigerator


State and verify the gas laws for an ideal gas experimentally
In groups, learners are guided to:

Distinguishing between boiling and melting points
Stating factors affecting boiling and melting points
Experiments to illustrate boiling and melting point

Experiments to verify pressure law
Demonstrations on pressure law
Discussion on pressure law

Pressure cooker
Refrigerator
Charts on melting and boiling points
Ice
Heat
Sufuria
water

Water
Thermometer
Measuring cylinder
Syringe
Narrow glass tube
Comprehensive secondary physics students book 3 pages 97-101
Comprehensive secondary physics teachers book 3 pages 42-46
Secondary physics KLB students book 3 page 246-282-288 
Comprehensive secondary physics students book 3 pages 103-104
Comprehensive secondary physics teachers book 3 pages 47-50
Secondary physics KLB students book 3 page 299-302
6 5
The Gas Laws
Pressure law
By the end of the lesson, the learner should be able to:


State and verify the gas laws for an ideal gas experimentally
In groups, learners are guided to:

Experiments to verify pressure law
Demonstrations on pressure law
Discussion on pressure law

Water
Thermometer
Measuring cylinder
Syringe
Narrow glass tube
Comprehensive secondary physics students book 3 pages 103-104
Comprehensive secondary physics teachers book 3 pages 47-50
Secondary physics KLB students book 3 page 299-302
7 1
The Gas Laws
Charles?s law
By the end of the lesson, the learner should be able to:


State and verify Charles?s law experimentally
In groups, learners are guided to:

Experiments to verify Charles?s law
Discussion on Charles?s law

Water
Thermometer
Measuring cylinder
Syringe
Narrow glass tube
Comprehensive secondary physics students book 3 pages 105-106
Comprehensive secondary physics teachers book 3 pages 47-50
Secondary physics KLB students book 3 page 295-298 
7 2
The Gas Laws
Boyle?s law
By the end of the lesson, the learner should be able to:


State and verify Boyle?s law experimentally
In groups, learners are guided to:

Experiments verifying and explain Boyle?s law
Discussion on Boyle?s law

Water
Thermometer
Syringe
Measuring cylinder
Narrow glass tube
Comprehensive secondary physics students book 3 pages 106-107
Comprehensive secondary physics teachers book 3 pages 47-50
Secondary physics KLB students book 3 page 290-294
7 3-4
The Gas Laws
The Gas Law?s
The kinetic theory of gases
By the end of the lesson, the learner should be able to:


Convert Celsius scales to Kelvin scale of temperature and state basic assumptions of kinetic theory of gases


Explain law absolute zero temperature may be obtained from pressure and temp. graphs
In groups, learners are guided to:

Discussion on basic assumptions of kinetic theory of gases
Conversion of Celsius to Kelvin scales

Discussions on the absolute zero temperature from pressure using kinetic theory of gases

Graph paper
Clinical thermometer

Graph paper
Clinical thermometer
Working out sums
Comprehensive secondary physics students book 3 pages 110-111
Comprehensive secondary physics teachers book 3 pages 50-51
Secondary physics KLB students book 3 page 107
Comprehensive secondary physics students book 3 pages 108-110
Comprehensive secondary physics teachers book 3 pages 47-50
Secondary physics KLB students book 3 page 303 
8

End term exam


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