Friction is a force that opposes the relative motion between two surfaces in contact. It acts in the direction opposite to the applied force or motion., Causes of Friction, Friction is caused by the irregularities on the surfaces of the objects in contact. Even surfaces that appear smooth have microscopic "hills and valleys" that interlock, creating resistance when one surface tries to move over the other., Factors Affecting Friction, The force of friction depends on:, Nature of the surfaces: Rough surfaces have more irregularities and thus create more friction than smooth surfaces., Force pressing the surfaces together (weight): The harder the two surfaces are pressed together (e.g., due to an object's weight), the greater the friction..

Friction

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