state the likely cause of friction...
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49
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Friction is a force that resist the relative motion between two objects or material. The causes of the resistive force are molecular adhesion, surface roughness, and deformation .but surface roughness is a factor when the materials are rough enough to cause serious abrasion.
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25
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Friction is caused by the ' interlocking of irregularities ' in the surfaces of the two objects which are in contact with each other.
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