If the coefficient of friction is 0.20 and the normal force is 10 N, what is the frictional force?

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Multiple Choice

If the coefficient of friction is 0.20 and the normal force is 10 N, what is the frictional force?

Explanation:
Frictional force depends on how hard the surfaces press together and how rough they are. Its magnitude is f = μN. Here the normal force is 10 N and the coefficient of friction is 0.20, so f = 0.20 × 10 = 2 N. This force acts to oppose motion along the contact surface. The other numbers would imply different μ values (e.g., 0.5 N would need μ = 0.05, etc.), which don’t match the given coefficient.

Frictional force depends on how hard the surfaces press together and how rough they are. Its magnitude is f = μN. Here the normal force is 10 N and the coefficient of friction is 0.20, so f = 0.20 × 10 = 2 N. This force acts to oppose motion along the contact surface. The other numbers would imply different μ values (e.g., 0.5 N would need μ = 0.05, etc.), which don’t match the given coefficient.

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