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;[[static friction]]
;[[static friction]]
:the force that is needed for motion to start if the surfaces are initially at rest with respect to each other.
:the force that is needed for motion to start if the surfaces are initially at rest with respect to each other.
;[[dynamic friction]]
;[[Kinetic friction]]
:the force that is caused by friction once the surfaces are moving with respect to each other.
:the force that is caused by friction once the surfaces are moving with respect to each other.