Phys2A_F07_Lecture_14a

Phys2A_F07_Lecture_14a - Friction & Drag Friction opposes...

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W. P. Beyermann Fall 2007 1 Friction & Drag • Friction opposes motion, except in the case of the force of propulsion. The static frictional force is directed opposite to the applied force, and its magnitude matches the applied force, up to a maximum value of μ s n where n is the normal force. • Once an object starts to move, static friction is replaced with kinetic friction. The kinetic frictional force is directed opposite to the object’s velocity, and its magnitude is equal to k n , which is less than the maximum magnitude of the static frictional force.

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W. P. Beyermann Fall 2007 2 Static Friction •Static friction is a force that keeps an object from slipping. •It acts in response to the applied force. Its direction is opposite to the applied force, and its magnitude matches the applied force, so that the net force on the object remains zero. •Eventually the applied force exceeds a limit that the static friction can provide, and the object starts to move.
W. P. Beyermann Fall 2007 3

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W. P. Beyermann Fall 2007
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This note was uploaded on 04/07/2008 for the course PHY 2A taught by Professor Beyermann during the Fall '08 term at UC Riverside.

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Phys2A_F07_Lecture_14a - Friction & Drag Friction opposes...

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