Friction
A force that opposes the motion between two surfaces in contact, acting parallel to the surfaces and in the opposite direction of motion.
Pushing a box across the floor shows friction acting against the direction of the push, making the box harder to move.
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.
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
Static friction is always greater than dynamic friction. This is why it's harder to start moving a stationary object than to keep it moving.
Key differences between static and dynamic friction:
Try sliding a hockey puck across ice:
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
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