What happens to the coefficient of friction, when weight of the body is doubled?

Coefficient of Friction is defined as the ratio of the max resisting force parallel to the contact surface to the forces pressing them together. The coefficient of friction can vary depending on whether the body is moving or not.

We know that,

Friction = Coefficient x Normal reaction

Therefore, by doubling the weight, the coefficient of friction remains unchanged. Also, it is dependent on the nature of the surface.

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