Friction is a force that opposes motion between two surfaces that are in contact with each other. In sports and exercise, it's absolutely crucial - without it, we couldn't run, grip equipment, or even stay upright!
Friction always acts parallel to the surfaces in contact and opposite to the direction of motion (or potential motion).
Types of Friction
There are three main types of friction we need to understand:
Static Friction
Acts when surfaces are not moving relative to each other
Prevents objects from starting to move
Usually larger than kinetic friction
Kinetic (Dynamic) Friction
Acts when surfaces are sliding past each other
Opposes ongoing motion
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