Question

write about the origin of friction ​

Answer 1

Answer:

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Explanation:

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Answer 2

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If smooth surfaces are observed under powerful microscope, many irregularities and projections are observed. Friction arises due to interlocking of these irregularities between two surfaces in contact. The surfaces can be made extremely smooth by polishing to avoid irregularities but it is noticed that in this case also, friction does not decrease but may increase. Hence the interlocking of irregularities is not the real cause of friction.

According to modern theory, cause of friction is the force of attraction between molecules of two surfaces in actual contact in addition to the force due to the interlocking between the two surfaces. When one body is in contact with another body, the real microscopic area in contact is very small due to irregularities in contact. shows the microscopic view of two polished surfaces in contact. Due to small area, pressures at points of contact is very high. Hence there is strong force of attraction between the surfaces in contact.

If both the surfaces are of the same material the force of attraction is called cohesive force while if the surfaces are of different materials the force of attraction is called adhesive force. When the surfaces in contact become more and more smooth, the actual area of contact goes on increasing. Due to this, the force of attraction between the molecules increases and hence the friction also increases. Putting some grease or other lubricant (a different material) between the two surfaces reduces the friction.