Question

Question 20
A marble is allowed to roll down an inclined plane from a fixed height. At the foot of the inclined plane, it moves on a horizontal surface (a) covered with silk cloth (b) covered with a layer of sand and (c) covered with a glass sheet. On which surface will the marble move the shortest distance. Give reason for your answer.

Answer 1

The answer is, (b) covered with a layer of sand.
On the surface covered with sand, it will cover the least distance because sand offers maximum friction against its motion.