Question

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 a reason for your answer.

Answer 1

The marble will move shortest on the floor covered with sand. Sand will allow more friction between marble and floor making it hard to move longer.