A-LevelPhysicsDynamics9702/12 · Feb/Mar 2018 · Q71 Mark
A stone of mass m is dropped from a tall building. There is significant air resistance. The acceleration of free fall is g. When the stone is falling at a constant (terminal) velocity, which information is correct?
Amagnitude of the acceleration of the stone: g, magnitude of the force of gravity on the stone: zero, magnitude of the force of air resistance on the stone: mg
Bmagnitude of the acceleration of the stone: zero, magnitude of the force of gravity on the stone: mg, magnitude of the force of air resistance on the stone: mg
Cmagnitude of the acceleration of the stone: zero, magnitude of the force of gravity on the stone: zero, magnitude of the force of air resistance on the stone: mg
Dmagnitude of the acceleration of the stone: zero, magnitude of the force of gravity on the stone: mg, magnitude of the force of air resistance on the stone: zero
✓ Correct answer
B: magnitude of the acceleration of the stone: zero, magnitude of the force of gravity on the stone: mg, magnitude of the force of air resistance on the stone: mg
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