Friction
Friction
is a resisting force between two surfaces that are sliding
against each other. Static friction is the frictional force
that opposes any attempt to start a body moving that is a
rest. Kinetic friction is the frictional force that tends
to slow a body already in motion. The force due to kinetic
friction is generally proportional to the applied force, so
a coefficient of kinetic fiction is defined as the ratio of
frictional force to the normal force on the body. In general,
static friction is greater than kinetic friction.
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