____ is the force that 2 surfaces apply on each other when they ____ against each other. A ____ surface creates more friction. Friction acts in a direction ____ of the direction of the objects motion. The direction and ____ of force is represented with an arrow called ____. The head shows the direction and the length of the arrow shows the magnitude. The type of a ____ affects the friction force together with the forces applied on the object. If the surface is smooth than the friction is ____ and if it is rough the friction is more.

FRICTION FORCE

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