Multiple choice

Three boxes of the same material filled with oil, sand and graphite, respectively have the same weight. The surface area of the box which is filled with oil is larger than the other two. If the three boxes are allowed to push simultaneously, then which of the following statements is true?

  1. Force of friction will be more on the oil box.

  2. Force of friction will remain the same on all boxes.

  3. Force of friction will be more on the sand and graphite box than the oil box.

  4. Force of friction will be more on the sand box only.

  5. Force of friction will be less on the oil box.

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

Force of friction will remain the same for all the boxes because friction is independent of the area in contact, its only depends upon weight.