Study the following activity and answer the questions.
1. Take two aluminium channels of different lengths.
2. Place the lower ends of the channels on the floor and hold their upper ends at the same height.
3. Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.
Which law related to energy does the above activity demonstrate? Explain.
i. The above experiment law explains law of conservation of energy which states ‘Energy can neither be created nor destroyed. It can be converted from one form into another.
ii. Thus, the total amount of energy in the universe remains constant’.
iii. As we can see here potential energy of both the ball have transferred into kinetic energy and also , kinetic energy of both the balls upon reaching ground was same since their speed was same as they travelled equal distances, this indicates in both cases the initial potential Energy (Same for both as both were at same height) have been converted to kinetic energy and amount of total energy is same for both the balls , and energy has been interconverted from potential to kinetic in both the cases by same amount i.e. it can be generalized that total energy remained constant throughout.
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