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Question

Wheels are added to a trolley for smooth travel. What is the principle behind this?


A

True

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B

False

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C

Both sliding friction and rolling friction are the same

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D

There is no comparison between sliding friction and rolling friction.

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Solution

The correct option is B

False


Area of contact in rolling is much lesser than sliding. As rolling friction is less than sliding friction, by adding wheels to trolley the friction is reduced. If the same amount of force is applied, trolley moves more distance in rolling than sliding.


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