Frictional force is a contact force. Frictional force always acts between two moving objects, which are in contact with one another. Frictional force always acts opposite to the direction of motion . Frictional force depends on the nature of the surface in contact. What does it mean exactly? Please explain in the easiest way.
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Yes, frictional force is a contact force because it requires two object in contact. It always opposes the motion of an object because the two surfaces in contact interlock with each other due to the irregularities of the surfaces.
The more irregularities in the surfaces creates more friction, that's why friction depends on the nature of the surface in contact.
The more irregularities in the surfaces creates more friction, that's why friction depends on the nature of the surface in contact.
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