Two boxes A and B have the same weight and the same surface in contact with the floor. Box A is wrapped in polythene; Box B is wrapped in jute cloth. Which box will require MORE force to start moving on the floor?
ABoth will require the same force — friction depends only on weight
BBox A (polythene) — because polythene is heavier
CBox B (jute) — because jute is rougher, so static friction is greater
DBox A (polythene) — because polythene is smoother
Answer & Solution
Correct answer: C. Box B (jute) — because jute is rougher, so static friction is greater
Friction depends on the nature of the surfaces in contact, not just the weight pressing them. Jute is rough; polythene is smooth. So for the same weight, the box wrapped in jute experiences more friction with the floor and is harder to start moving.
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