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Coefficient of Friction
A number that measures how much friction exists between two surfaces. It's also a measure of how much force is required to move an object across a surface
Dynamic Friction
Dynamic friction is the force that resists the motion of an object that is already moving. It's also known as kinetic friction.
Friction
A force that opposes the motion between two surfaces in contact, acting parallel to the surfaces and in the opposite direction of motion.
Static Friction
Static friction is the force that prevents objects from moving, while dynamic friction is the force that opposes the motion of objects that are already moving