What causes friction between two surfaces in contact when they try to slide past each other?

Interlocking of irregularities present on the surfaces

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Rigidity of the surfaces

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Gravitational attraction between the surfaces

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Presence of atmosphere around the surfaces

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Solution

The correct option is A
Interlocking of irregularities present on the surfaces

Friction is caused by interlocking of irregularities present on the surfaces in contact. Rough surfaces have larger irregularities while smoother surfaces have lesser irregularities. Hence, rough surfaces offer more friction as compared to smooth surfaces. Even surfaces that appear smooth have numerous minute irregularities present on them.

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Similar questions

Q. The interlocking between the irregularities of two surfaces in contact causes friction.

Q. The interlocking of the depressions and elevations (irregularities) present on the surfaces of the bodies in contact cause friction.

Q. When two surfaces in contact are very rough, between the surfaces is the main cause of friction.

Consider the following statements:

Statement 1: Rough surfaces generally have more friction between them.
Statement 2: When we attempt to slide one surface over another, we have to apply a force to overcome interlocking between the irregularities present on the surfaces.

Choose the correct option.

Consider the following statements:

Statement 1: Friction is caused due to interlocking of irregularities present on the surfaces in contact.
Statement 2: Frictional force increases if the two surfaces are pressed harder.

Which of these statements is/are correct?

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