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.
Related questions
Two masses hang from a rope over a light frictionless pulley. Along that rope the tension Spreading out into a spread-eagle position drops that terminal speed to about:A 75 kg skydiver falling head first reaches a terminal speed of roughly:Drag also depends on the density of the fluid, the drag coefficient and the object's:At everyday speeds, drag force is proportional to the speed of the object raised to the poLike friction, the drag force on a moving object always acts to oppose its:The outward pull a rider seems to feel on a merry-go-round is mistakenly called the:A passenger feels thrown sideways when the car turns. That apparent push is an inertial or