A-LevelPhysicsWork, energy and power9702/12 · Feb/Mar 2018 · Q181 Mark
Two boxes X and Y have the same mass. Box X is lifted vertically through a height h by a force of magnitude F. Box Y is pulled along a slope by a force of the same magnitude to reach the same height, as shown. [Figure 18.1] Which statement is correct?
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ABoth boxes gain the same amount of gravitational potential energy and the same amount of work is done by the two forces.
BBoth boxes gain the same amount of gravitational potential energy but more work is done by the force acting on box Y than by the force acting on box X.
CBox Y gains less gravitational potential energy than box X because the weight of box Y is less than the weight of box X.
DBox Y gains more gravitational potential energy than box X as more work is done by the force acting on box Y than by the force acting on box X.
✓ Correct answer
B: Both boxes gain the same amount of gravitational potential energy but more work is done by the force acting on box Y than by the force acting on box X.
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