The force that hinders the relative motion of the object (or relative motion tendency) is called friction. The direction of friction is opposite to the direction of relative motion (or relative motion) of the object.
Static friction is when two objects in contact with each other are relatively stationary, but there is a tendency to move relative to each other, and a force that blocks relative motion is generated between the contact surfaces. This force is static friction.
The friction that occurs in dynamic friction is called "dynamic friction." After the object moves, there is also the force that prevents the object from moving, that is, the frictional resistance. The friction generated by the movement of such an object is called the frictional force.
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