The law of conservation of energy states that.......
Energy can neither be created nor destroyed but can only be changed from one form to another.
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Where do humans get energy to do work from?
Humans get energy from eating food
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Fuels are useful stores of fuel. How do we get energy from fuel?
When we burn the fuel
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A battery can be used in an electrical device such as a torch.
a) What type of energy is stored in a battery?
Chemical energy
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b) When the torch is turned on energy is transferred to from the battery to the bulb. What type of energy is transferred to the bulb?
Electrical energy
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What two type of energy are transferred from the bulb when the torch is turned on?
Light energy and Heat energy
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Jamila works in a circus. He runs along the ground,jumps onto a trampoline and goes high up into the air.
a) Name the type of energy Jamila has when she is running?
Kinetic energy
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b) Name the type of energy stored by the trampoline when it is stretched downwards.
Elastic energy
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c) Name the type of energy Jamila has when she is up high in the air.
Gravitational potential energy
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Identify the forms of energy stored in the following
a) DRUM
sound energy
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b) compressed spring
elastic energy
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c) water in high dams
Gravitational potential energy
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Kamau left his torch on overnight, and in the morning he realized that the torch has become very dim. He said that a lot of energy has disappeared from the torch. Explain why his statement was wrong.
Energy did disappear but was transformed into heat and light energy by the bulb.
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What is a source of light? give 2 examples
A light source is an object that emits its own light eg flames, sun
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What is a ray?
a ray is a path of light
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what are luminous sources? give 2 examples
a luminous source are objects that produce their own light stars and light bulbs
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Other cards in this set
Card 2
Front
Where do humans get energy to do work from?
Back
Humans get energy from eating food
Card 3
Front
Fuels are useful stores of fuel. How do we get energy from fuel?
Back
Card 4
Front
A battery can be used in an electrical device such as a torch.
a) What type of energy is stored in a battery?
Back
Card 5
Front
b) When the torch is turned on energy is transferred to from the battery to the bulb. What type of energy is transferred to the bulb?
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