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Laws of Motion
Question
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Why sliding friction is greater than rolling friction?

Answer

In sliding motion, the heights of cavities on the surface are to climb up which introduces the friction. While in rolling motion the heights of cavities are to cross over which avoids the friction. 

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Some More Questions From Laws of Motion Chapter

A person jumping out from a moving car or bus falls forward. Why?

Due to what type of inertia, the spark leaves the grind stone tangentially while sharpening the knife?

Which law of motion is also called law of inertia?

What is measure of inertia of body?

Which law of motion defines the force?

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Why do we pull the rope in downward direction for climbing up?