When two objects are rubbed together, it creates a force of friction. We often find it difficult
to walk on smooth oily floor. Friction causes moving object to stop or even helps us to hold
objects properly. It is a very useful force but at the same time it also
becomes an evil.
a. What is the cause of friction ?
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The interlocking of irregularities of the two surfaces opposes the motion of one object over the other and give rise to force of friction. Friction is caused by the interlocking of irregularities in the surface of two objects which are in contact with each other.
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