Question

5. When you roll down a ball it comes to rest after some time. Why?
6. Recognise the property of the surfaces which affects the force of friction.
7. Why do tyres wear out after some years of usage?
8. List two situations where the force of friction is a necessity.​

Answer 1

Answer:

5.it is due to friction

8.we use friction while walking friction is opposing force we need friction while walking it is necessary

hope it helps you

Answer 2

Answer:

5. because of the frictional force acting in the direction opposite to the motion of the ball.

6. The roughness of the surface. More the roughness, more will be the friction.

7. due to friction that occurs between the tyres and the road.

8.

(i) when walking: without friction, we'll never be able to walk.

(ii) while writing: we are able to write on surfaces only because of friction.

Hope this helps :)