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Q.

[3][4]:
Is it true that friction depends upon the roughness and smoothness of surfaces?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is True.
When two rough surfaces come into contact, they generate frictional or opposing force. The friction generated is dependent upon the roughness and smoothness of the sliding object. The rougher the object, the more friction is generated; hence, its movement will become restricted. Conversely, the smoother the object is, the more smoothly it can move.
The force that resists movement an object comes in contact with the surface of another is called friction. The mechanical advantage of a machine is that the ratio of output to input is reduced because of friction.

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