Q4 of 26 Page 28

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.




Why do the balls cover the same distance on rolling down?

Now since balls have same initial potential energy as both are at same height above the ground, and all the potential energy is converted into kinetic energy in both the balls, so kinetic energy of both the balls on just reaching the floor will be same , now kinetic energy depends upon velocity of the ball , since kinetic energy of both the balls is same , so both will have same velocity on the floor, with which they are moving forward. Now both ball will stop after covering some distance due to friction, but since their initial velocity on floor is same they will cover equal distances before stopping.


More from this chapter

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4

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.




Questions


At the moment of releasing the balls, which energy do the balls have?

 4

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.




As the balls roll down which energy is converted into which other form of energy?

 4

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.




What is the form of the eventual total energy of the balls?

 4

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.