Rolling Friction

Q. A ball rolling on the ground slows down after a while due to friction between the surface of the ball and the ground.

1. True
2. False

Q.

Wheels are added to trolleys for smooth movement. What is the principle behind this?

1. Sliding friction is less than rolling friction

2. Sliding friction is more than rolling friction

3. Both sliding friction and rolling friction are the same
4. There is no comparison between sliding friction and rolling friction.

Q. A ball rolling on a grass field slows down due to:

1. Magnetic force
2. Frictional force
3. Electrostatic force
4. Gravitational force

Q.

It is easier to drag a wheel than to roll it.

1. True

2. False

Q. A ball rolling on a grass field slows down due to:

1. Frictional force
2. Gravitational force
3. Magnetic force
4. Electrostatic force

Q. A ball rolling on a grass field slows down due to:

1. Magnetic force
2. Gravitational force
3. Electrostatic force
4. Frictional force

Q.

A ball rolling on the ground comes to rest after covering a certain distance. Why?

Q. A ball rolling on a grass field slows down due to:

1. Magnetic force
2. Gravitational force
3. Frictional force
4. Electrostatic force

Q.

Since rolling friction is less than sliding friction, sliding friction is replaced with rolling friction in most machines using ball bearings.

1. False

2. True

Q. What is the function of rollers in skating shoes?

1. They utilize rolling friction.
2. They make the shoes look beautiful.
3. They make the shoes last longer.
4. They reduce rolling friction.