Physics Review QuestionUnit:
MassYear:
1992 Question#:
15Question:
Two rocks weighing 5 newtons and 10 newtons, respectively, fall freely from rest
near the Earth's surface. After 3 seconds of free-fall, compared to the 5 newton
rock, the 10-newton rock has greater:(1
) acceleration(2
) height(3
) momentum(4
) speedWhat is this question really asking?
Explanation by: Joe W. [ Return to question menu
]Answer 1
acceleration INCORRECT- because of the neglection of air friction the two rocks would be accelerating at a same rate. return to top
Answer 2
height INCORRECT- because they are falling at the same rate, their height's will be the same. return to top
Answer 3
momentum CORRECT - even their velocity's are the same, the masses are different. Momentum is mass times velocity. p=mv so the momentum of the 10 newton rock will be greater than the momentum of the 5 newton rock. return to top
Answer 4
speed Incorrect Because they are falling at the same rate, their speed's wil be the same. return to top
What's this question really asking?
As the 10N rock and the 5 Newton rock fall , what thing will be different after 3 seconds? return to top |

[Home] [Lessons] [Review] [Links]
This web site is designed and maintained by Science Joy Wagon and may
not be reproduced or redistributed without written permission from Science Joy Wagon. |