Question

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☃️What is the cause of friction?

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Answer 1

Answer:

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●Causes Of Friction●

Due to interlocking of surfaces

▶️ No solid surface is perfectly smooth. This means all solid surfaces are rough. The degree of roughness varies from surface to surface some are more rough, while some others are less. Even a surface which look smooth to the naked eyes is actually rough. In case of highly rough surfaces, the surface roughness can be seen, felt easily.

☯️$\huge\red{Example 1}$☯️

→ When a body (say, a wooden block) is pulled over another,these 'hills' and 'valleys' interlock with each other and oppose the relative motion between the two bodies. This gives rise to a frictional force. Thus, friction is due to the roughness of the two surfaces in contact.

Due to force of adhesion between the two surfaces

▶️ Two rough surfaces when placed together meet only at certain points. The atoms or molecules present at such points of contact attract each other due to electrostatic attractions. These attractions are called forces of adhesion.

☯️$\huge\red{Example 2}$☯️

→ when one body is made to move over the other, the force of adhesion opposes the motion. This force which opposes the motion also gives rise to frictional force. So, the force of adhesion between the two surfaces gives rise to friction.

☯️$\huge\mathfrak{The End!}$☯️

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