Question

7 Which statement is NOT true about friction? a friction is great in a rough surface b. friction is less in a smooth surface c.friction is only present in object in motion d. friction is present in smooth and rough surface 8. Which of the following statements correctly describe the role of friction in the motion of the train2 a.friction is necessary to make the train stop b. friction is necessary for the traction as the train starts moving c. friction is necessary to keep the train on the track as it moving d. all of the above 9. Why it is more difficult to travel in a rough surface compared to a smooth surface? a. friction is less in a rough surface b. friction is great in a rough surface c. friction is reduced in a rough surface d.friction is not present in a rough surfac

Answer 1

We will have the following:

7. The statenebt about friction that is not true is:

* Friction is only present in objects in motion. [Option C]

8. The statements that correctly describe the role of friction in the motion of trains are:

* Friction is necessary to make the train stop.

* Friction is necessary for the traction as the train starts moving.

* Friction is necessary to keep the train on the trac as it is moving.

All of the above. [Option D]

9. The reason that it is more difficult to travel in a rough surface compared to a smooth surface is that:

* Friction is great in a rough surface. [Option B]