What factors responsible for friction ?
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Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.
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1).Friction is caused by the interlocking of irregularities of the two surfaces when one object is placed over another object.
2). If the two surfaces of objects are pressed together harder by a great force, then the friction will increase.
3).Suppose we have two boxes of same size but one box is light and other box is heavy.
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