Friction is the force that opposes the motion of an object when it comes into contact with another object or surface. It acts in the opposite direction to the applied force.
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Applied Force: An applied force is a push or pull exerted on an object by another object or person. It can change the state of motion or shape of an object.
Static Friction: The frictional force that prevents an object from moving when a force is applied but not strong enough to overcome it.
Kinetic Friction: The frictional force that opposes the motion of an object already in motion.