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.




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

Now as the balls roll down they will gain velocity and height of the balls above the floor will decrease, i.e. potential energy of the ball will be decrease and kinetic energy will increase as they roll down with velocity v as shown in figure


Now kinetic energy of the balls of mass m moving with velocity v will be


K.E. = � mv2


More from this chapter

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3

Rewrite the following sentences using proper alternative.

The work done on an object does not depend on ….


i. displacement


ii. applied force


iii. initial velocity of the object


iv. the angle between force and displacement.

 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.




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

 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?