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14-11-2022
Physics

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when two objects slide against one another, which of the following statements about the force of friction between them is true?
a. The magnitude of the frictional force is always equal to \mu_{\rm k}n.
a. The magnitude of the frictional force is always less than \mu_{\rm k}n.
b. The magnitude of the frictional force is determined by other forces onthe objects so it can be either equal to or less than \mu_{\rm k}n.

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