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An Intiative by Sri Chaitanya

small brakes are more effective for cycle than big brakes

the coefficient of friction is a dimension less and

unit less quantity

friction always take place normally to the plane of contact

on a smooth surface co efficient of static friction is equal to 1

answer is B.

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Detailed Solution

*Co efficient of friction is the ratio of same physical quantities. So, it won’t have any unit and dimension.

*Size of breaks is not matter in their effectiveness. Because limiting friction between two bodies in contact is independent of the area of surface in contact.

*Friction develops parallel to the plane of contact.

*For smooth surface co efficient of friction $(μ) = 0$

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