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Q.

Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Is it true that the balls start rolling?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is True.
Balls will start rolling in the direction in which the train was moving. The train stops when the brakes are applied, but the balls try to continue moving owing to inertia, thus they start to roll. The inertial forces on the two balls are not equal because the masses of the balls are different. As a result, the balls will move at various speeds.

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Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Is it true that the balls start rolling?