A boy rolls a rubber ball on a wooden surface.

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.

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