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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. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer.
 
, the balls  rolling in the direction in which the train was moving.
 
This is because, after applying the brakes, train  but the balls  due to inertia.
 
Since the mass between two balls is not the same, the inertia of the iron ball is  than the inertia of the rubber ball.
 
Hence, rubber ball rolls  than the iron ball.