Multiple choice

Tie a string of spring balance around brick. Pull it with spring balance and note down the reading when brick just begins to move. Now repeat by placing the brick in polythene and then by placing the brick wrapped in a newspaper. In which of the following cases do we get small value of force of friction?

  1. When we pull brick

  2. When we pull brick wrapped in newspaper

  3. When we pull brick wrapped in polythene

  4. Same value in all cases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 When we pull brick wrapped in polythene because it reduces force of friction.

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