Question

. How does friction depend upon the nature of the surfaces in contact
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Answer 1

Answer:

every object has a rough surface, though the surface may appear to be smooth to the naked eye. We we see through a microscope, it is found that the surfaces of all the objects have rough edges. Some of t particles on the surface of objects are in the form of tiny hills while others form grooves (see Figure 4). T tiny hills and grooves on the surfaces of objects are called irregularities of surfaces. When we try to move are object over another object, the irregularities present on their surfaces get entangled (or locked) w one another (see Figure 4). The interlocking of irregularities of the two surfaces opposes the motion of ore object over the other and gives rise to force of friction. Thus, friction is caused by the interlocking of irregularities in the surfaces of the two objects which are in contact with each other. When we attempt is move one object over the other, we have to apply a force to overcome interlocking of the irregularities in their surfaces More the roughness of a surface, larger is the number of irregularities on its surface and hence greater will be the friction Thus, the force of friction is greater if very rough surfaces are involved.

Explanation:

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Answer 2

If the surfaces in contact are rough, then there are more interlocking in between and thus more frictional force. If the surfaces are smooth, then there are lesser interlocking in them and thus there is lesser friction. So, friction depends upon the nature of the surfaces in contact.

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