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Merits and Demerits of Friction

Wheels are ad...

Question

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

A

Sliding friction is less than rolling friction.

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B

Rolling friction is less than sliding friction.

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C

Rolling friction is less than static friction.

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D

Static friction is less than rolling friction.

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Solution

The correct option is B
Rolling friction is less than sliding friction.

Wheels are added to trolleys to reduce friction. As rolling friction is lesser than sliding friction, adding wheels to trolleys reduces opposition to motion.

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