Rolling Friction

What is friction?

• §The force which slows down the motion of a moving body in contact with the surface of another body is called friction (frictional force)

• §The force which opposes the rolling motion of an object

• §It is less than the sliding friction on a body of the same mass.

• §When one object rolls on another object, Friction comes into play.

What is Rolling Friction?

• §The force which slows down the motion of a moving body in contact with the surface of another body is called friction (frictional force)

• §Sliding Friction

• §Static Friction

• §The force which opposes the rolling motion of an object is called Rolling Friction.

  §It is less than the sliding friction on a body of same mass.

Name the three types of Friction.

• §Sliding Friction

  §Rolling Friction

  §Static Friction

• Contact Force

• Non-Contact Force

• None of the options.

Name any two facts about rolling friction.

• §The force which opposes the rolling motion of an object is called Rolling Friction.

  It is less than the sliding friction on a body of same mass.

• §The force which slows down the motion of a moving body in contact with the surface of another body is called friction (frictional force)

• 1. Rolling friction is generally less than sliding friction                 2. Rubber tyres have more rolling friction on rough surfaces than on smooth surfaces.                                                                           

• §3. With the increase in smoothness, the force of rolling friction decreases.

Name any one example of Rolling Friction (which are given in the ppt)

• Vehicle

• Tomato

• Glass

• Bowl

Answer explanation

When you start a vehicle, the vehicle moves in its direction suppose forward. The tyres (wheels) of the vehicle move in the opposite direction so that, the car can go in its direction. The friction of the vehicle tyres and between the road so that, it can go in its direction is called Rolling Friction.