Multiple choice

In which of the following cases is more friction needed?

  1. Creaking hinge of a door.

  2. Between machine parts with less grease.

  3. Spilling soapy water on a smooth granite floor in the kitchen.

  4. An aeroplane taking off.

  5. Carroms being struck on a carrom board.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

More friction is needed in an area where there is spilling of soapy water to prevent a person from falling.