Friction

Which one of these produces least friction?

• Rolling friction

• Sliding friction

• Static friction

• None of these

Answer explanation

This is because the size of the area in contact is less in rolling friction.

Friction always ____ the motion.

Tags

NGSS.MS-PS2-2

Friction can be reduced by using...

• Oil

• Grease

• Powder

• All of these

Which of the following is not a smooth surface?

• Surface of tyre

• Surface of mirror 

• Surface of wet floor

• Surface of tiles

On which surface will a toy car go faster?

• Muddy surface

• Polished marble surface

• Brick surface

• Cemented surface

Why do we apply oil on door hinges?

• To increase friction

• To decrease friction

• None of these

Friction depends on...

• Roughness of a surface

• Size

• Weight

• All of these

Smooth surface has..

• More friction

• Less friction

• None of these

Bodies of birds, fishes and ships are ____

Friction is a...

• non-contact force

• contact force

• magnetic force

• electrostatic force

Answer explanation

Friction happens when two surfaces touch each other, so it is a contact force.