Friction: Friction is a resistive force that occurs when two bodies in contact move relative to one another. Causes of friction: 1)Adhesion between body surfaces: When two materials are in close proximity to one another, a molecular force called adhesion is created. When water is poured into a glass, it wets the surface of the glass due to the adhesion force that exists between the surface of glass and water. 2)Surface roughness:A frictional force or an opposing force is produced when two rough surfaces come into contact with one another. This force can occasionally be converted into heat. 3)Body deformation: During motion, deformations in the body or the surface of the body in contact may cause friction.
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