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Friction and Ground Reaction Force Lecture Notes Clear and concise notes taken during lecture. (Received an A)

2 Pages

Kinesiology & Health Science
Course Code
KINE 3030
William Gage

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Friction and Ground Reaction Force Friction  Force that acts between two surfaces on contact  For friction to occur there must be applied force perpendicular to the surface plane o If you have a box placed on a flat surface, there is no friction (but there IS a potential friction) o If this same box is pushed slightly to the right, a friction force is pushing back to the left, negating any change in position o However, you push a little more and the box does move (dynamic friction)  The magnitude of kinetic friction is constant and lower than the maximum static friction o Friction is greatest JUST before the object moves (Static friction)  The force applied is exactly equal to the force of friction  Greater surface area DOES NOT increase friction o If you have a smaller box vs a bigger box, there is no difference in friction Magnitude of Friction Depends on:  The applied force  Whether motion is occurring (static vs dynamic)  The coefficient of friction o Unit-less number that indicates how difficult something will sli
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