Question

what is friction? what is the cause of friction

Answer 1

the causes of the resistive force of friction are molecular adhesion, surface roughness and the plowing effect

Answer 2

Answer:

★ What is Friction?

• It is a an opposing force comes into play when one object moves on another or tries to move on another object.

★ Causes of Friction:

• Old View: According to old view roughness of surface is measure cause of friction, larger the area of contact between surface greater the force of friction.
• Modern View: According to modern view atomic or molecular force of attraction between two surface at the point is cause of friction.

Explanation:

★ Types of friction:

• Static friction: It is opposing force come into play when one object tends to move over the surface of another object but actual motion has not yet started this called static force.
• Limiting friction: It is the maximum opposing force comes into play when one object is just start the motion an another object.
• Kinetic friction: It is the opposing force come into play when one object is actually moving over the surface of another body.

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