A-LevelPhysicsDynamics9702/12 · Oct/Nov 2011 · Q101 Mark

A group of students investigating the principle of conservation of momentum use a small truck travelling over a frictionless surface. Sand is dropped into the truck as it passes X. At Y, a trapdoor in the bottom of the truck opens and the sand falls out. [Figure 10.1] How does the velocity of the truck change when the sand is added to the truck at X and then leaves the truck at Y?

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Adecreases at X, increases at Y

Bdecreases at X, stays the same at Y

Cstays the same at X, increases at Y

Dstays the same at X, stays the same at Y

✓ Correct answer

B: decreases at X, stays the same at Y

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