An impulse is a change in momentum usually over a short time. For which of the...
An impulse is a change in momentum usually over a short time. For which of the following is the force the greatest on a stress test automobile is remotely driven at 50 mph?
A. Car hits and sticks to a stationary vehicle
B. Car bounces off a wall
C. Car hits a sand pile
D. Car lands in the lake
Homework Answers
from the impulse momentum theorem
F del t = del P= m del V
F = m del V/del t
force the greatest when time is very small
option (a) is wrong because Car hits and sticks to a stationary vehicle so time is large
option (c) is wrong because Car hits a sand pile with large time
option (d) is wrong because Car lands in the lake
hence, option (B) is correct because Car bounces off a wall with small amount of time
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