A student pulls a box across a horizontal floor using a rope

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A student pulls a box across a horizontal floor using a rope. In which situation is the work done by the pulling force on the box equal to zero? (a) The box is dragged 5 m5\,\text{m} while the rope makes a 60∘60^{\circ} angle with the direction of motion. (b) The box is dragged 5 m5\,\text{m} while the rope makes a 90∘90^{\circ} angle with the direction of motion. (c) The box is dragged 5 m5\,\text{m} using a horizontal rope while the box moves at constant speed. (d) The box is dragged 5 m5\,\text{m} while the rope points directly opposite the direction of motion (180∘180^{\circ}).

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