d. Mention three examples showing change in the form of energy?
Ans.The sun's energy is used by plants to produce food.In a light bulb,electric energy changes to light and heat The chemical energy in the cell makes the car to move
e.Explain how the sun's energy changes to the muscular energy?
Ans.The sun's energy is used by plants to produce food.It changes into muscular energy when we eat this food.
f.What is a machine? How is it useful to us?
Ans.A machine is a device that does a physical task.It is useful to us because it makes our work easier.
g.What is a lever used for?
Ans.Lever is used to move heavy object and open things like the lid of a box.
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