A crate is pulled along a rough horizontal floor by a rope that exerts a force making…
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A 5kg crate is pulled 6m along a rough horizontal floor by a rope that exerts a 40N force making an angle 30∘ above the horizontal. The forces acting on the crate are: tension in the rope, kinetic friction, weight and the normal reaction. Which of these forces do no work on the crate during this motion?
(a) Only the normal reaction
(b) Weight, normal reaction and friction
(c) Both weight and normal reaction
(d) Only the weight