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Why is it difficult to run fast on sand?

The force exerted by our foot on the sand is less because time taken is large so it is difficult to run fast on sand.

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Question asked by drupadh_thapa
Answered by chimini_chand

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While walking on sand the small particles of sand rolls and hence there is rolling friction which is very less as compared to sliding friction. The rolling friction cannot provide required friction to run easily and hence it is difficult to run fast on sand

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Reply added by Sagar