Q38 of 100 Page 231

Which will cause more friction: a rough surface or a smooth surface? Why?

A rough surface will cause more friction than a smooth surface. Because, rough offers more resistance to the other surface in contact as compared to the smooth surface.


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36

When we try to push a very heavy box kept on ground, it does not move at all. Which force is preventing this box to move forward? Where does this force act?

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Explain why sliding friction is less than static friction.

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What is meant by 'rolling friction'?