Question

A block is placed on a platform which is kept on the ground. After a while, the platform starts moving. If the velocity of the block with respect to ground is the same as that of the platform with respect to the ground, then which of the following statement(s) is/are correct?

(i) Kinetic friction acts between the ground and the platform.
(ii) Kinetic friction acts between the ground and the block.
(iii) Kinetic friction acts between the platform and the block

Answer 1

Answer:

i is the answer right so kepp

Answer 2

Answer:

(i) Kinetic friction acts between the ground and the platform.

Explanation:

Given condition: A block is placed on a platform that's kept on the ground. After a short time, the platform starts moving. If the speed of the block with reference to the ground is the same as that of the platform with reference to the ground.

Kinetic friction acts between two surfaces in touch that are sliding against each other. Two facts about kinetic friction: Kinetic friction acts within the direction opposite to the relative tangential velocity of the 2 surfaces.

In the given case, Kinetic friction will act between the ground and the platform.