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00154_Friction (1).txt
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1995-12-08
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Friction is a force that resists
motion caused by the interaction of
two surfaces. Static friction is
the force that prevents an object
from beginning to move, while
kinetic friction is the force
that hinders an object's motion once
it is already moving. An object at
rest subject to static friction will
not move as long as the following
condition is satisfied:
where N is the normal force, is the coefficient of static friction, and is the force due to static friction. The value of the kinetic friction force is given by