Question

write a note on rolling friction according to 10 marks

Answer 1

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What is Rolling Friction?

→For a moving solid body, there are two principal types of friction that act upon it:

• The force resisting the motion of a rolling body on a surface is known as Rolling friction or Rolling resistance. Rolling of ball or wheel on the ground is an example of Rolling friction.
• The other type of friction is Sliding friction. In this type of friction, there is a restriction on the body’s movement as only one side of the body is in contact with the surface. Pushing a box across the table is an example of Sliding friction.

-Rolling friction is considerably weaker than Sliding friction.

Laws of Rolling Friction

→There are three laws of rolling friction:

• With the increase in smoothness, the force of rolling friction decreases.
• Rolling friction is expressed as a product of load and constant to the fractional power.F=kL^n
• Rolling friction force is directly proportional to load and inversely proportional to radius of curvature.F=μ×Wr

Cause of Rolling Friction:

→When an object is rolled on a surface, certain things happen:

1. The object is deformed at the point of contact with the surface.
2. The surface is deformed at the point of contact with the object.
3. Motion is created below the surface as a result of the above mentioned points.

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