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Friction Forces AP Physics C Mrs. Coyle

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**Outline Static Friction Kinetic Friction**

Coefficient of Friction (Static and Kinetic)

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Friction: the resistance to an object’s motion when it travels against a surface or in a viscous medium. It has a direction parallel and opposite the direction of motion. Static Friction, fs : the frictional force that exists when a force is applied to attempt to move an object across a surface but the object is not yet set in motion; fs counteracts the applied force. Kinetic Friction, fk : the frictional force that exists when an object has been set in motion across a surface.

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**Active Figure- Static and Kinetic Friction**

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**Coefficient of Friction, µ**

fs ≤ µs N (the equality holds in the case of impending motion). fk= µk N Values of µ depend on the surfaces and are usually between 0.03 and 1.0 µ has no units

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**Active Figure-Incline Plane With and Without Friction**

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Example 1: Find the coefficient of friction as a function of the angle ɵ, for the inclined plane shown a) for the case where the object is moving at constant velocity b)where the object is moving at a constant acceleration. ɵ m

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Example 2: A 1.00kg book is held against a wall by pressing it against the wall with a force of 50.00N. What must be the minimum coefficient of friction between the book and the wall, such that the book does not slide down the wall? F

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