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Explain why two surfaces in contact with...

Explain why two surfaces in contact with each other experience frictional force.

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Two surfaces in contact with each other experience frictional force due to irregularities on their surfaces. When two surfaces come in contact with eah other, these irregularities present on the surfaces of these objects interlock with each other. When one of these surfaces moves or tries to move with respect to the other surfaces, the interlocks between the surfaces resist this motion. This resistance gives rise to friction.
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Knowledge Check

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  • Two identical spheres are placed in contact with each other. The force of gravitation between the spheres will be proportional to ( R = radius of each sphere)

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  • Two blocks of masses m_(1) and m_(2) are placed in contact with each other on a horizontal platform. The coefficient of friction between the platform and the two blocks is the same. The platform moves with an acceleration. The force of interaction between the blocks is :

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