friction occurred due to
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The frictional force is a contact surface force which comes into effect whenever there is a tendency, or occurrence of relative motion between two surfaces. ... This produces an opposition to the relative motion and is the root cause of the frictional force.
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Friction always exists in pairs. On microscopic observation, we find friction occurs due to irregularity in surfaces. Types of Friction: Friction may be classified into two main types as follows: Internal Friction: It is the force which restricts motion between the elements constituting a solid material at the time of deformation.
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