Study the following activity and
answer the questions.
1. Take two aluminium channels of
different lengths.
Answers
1. At the moment of releasing the balls, they posses potential energy.
2. The potential energy of the balls converts to kinetic energy as they roll down.
3. Note: The question is wrong. It should be "Why do the balls cover same distance after rolling down"?
The balls will posses same potential energy because the channels are of same height as well as the weight of the balls are same. So, the balls on reaching the bottom of their respective channels will posses same kinetic energy (following the law of conservation of energy). Thus, the balls will have same velocity at the bottom of the channel. Because of the same velocity, they will cover equal distance on the ground. Thus, both the balls covers equal distance after rolling down the incline because they possessed same potential energy at the top of the channels.
4. The total energy of the ball will eventually be in the form of kinetic energy.
5. Law of conservation of energy is demonstrated using this activity. At the top of the channels, the total mechanical energy of the balls is in the form of potential energy. Now, as the balls roll down, they come into motion. This motion shows that the balls now posses kinetic energy too. As law of conservation of energy states that energy cannot be created nor destroyed, this means this kinetic energy came into existence because of decrease in potential energy of the ball (decrease in potential energy is due to decrease in height). Also, when the ball reaches the bottom, the total mechanical energy of the balls is in the form of kinetic energy. This shows that all the potential energy of the balls got converted to kinetic energy at the bottom.
Answer:
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