Smooth surface has _____ friction than a rough surface.

less

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equal

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constant

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more

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Solution

The correct option is A
less

Friction is caused by the irregularities on the two surfaces in contact. Larger the irregularities, the rougher the surface and more the friction. Thus, the smooth surface has less friction than a rough surface.

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10 N

A B

0.20

1.0 m

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