Question:
A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same, ball travel longer
distance before coming to rest, he may (a) spread a carpet on the wooden surface
(b) cover the ball with a piece of cloth
(c) sprinkle talcum powder on the wooden surface
(d) sprinkle sand on the wooden surface
Solution:
(c) Talcum powder reduces friction force and the ball will cover longer distance.