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Impulse & Momentum Quiz Review

Terms in this set (10)

A .5 kg dog is running at 13 m/s when its owner calls for it to run home and it changes its velocity to -13 m/s. What is the impulse experienced by dog?
-13 N*s
A 0.8 kg ball, initially traveling at 15 m/s is kicked by a soccer player, delivering a -3 N·s Impulse. Find the final momentum of the ball. Then, compute the final velocity of the ball.
Pf = 9 kgm/s & Vf = 11.25 m/s (kick only slowed it down, was not enough impulse to cause a change in direction
A 0.01 kg piece of chalk is rolling at 0.2 m/s before being kicked for 0.5 seconds so that its velocity is now -0.8 m/s. What is the change in momentum
.01 kgm/s
What is the momentum of a 6300 kg elephant if it is: a) sitting at rest b) walking at 80 m/s c) running at 100 m/s?
a) 0 kgm/s
b) 504,000 kgm/s
c) 630,000 kgm/s
If an object is moving with a momentum of 40 kgm/s, what will happen to the momentum if a) the velocity quadruples? b) if the velocity is cut in half? b) if the mass doubles?
a) 160 kgm/s, quadurples
b) 20 kgm/s, gets cut in half
c) 80 kgm/s, it doubles
A bowling ball is sitting on a table but falls to the ground after someone bumped into the table. The bowling ball makes contact with the ground for 0.01 seconds with 18 N of force, what impulse does it experience?
0.18 Ns
With what velocity must a 0.0003-kg marble be moving to equal the momentum of a 7.26-kg bowling ball moving at 5 m/s?
121,000 m/s
Find the final velocity of a 70-kg box traveling at 4m/s encountering a force of friction of 1 N for 0.350 seconds.
4.005 m/s
Which car experiences greater change in momentum of the following scenarios
1) A car moving 45 mi/h, with a mass of 1500 kg that runs into a concrete wall (with a crash dummy inside, dont worry).
2) A car moving 45 mi/h, with a mass of 1500 kg that slows to a stop at a yellow light.
same change in momentum, same change in velocity and same mass
Which car would experience a greater force & why?
1) A car moving 45 mi/h, with a mass of 1500 kg that runs into a concrete wall (with a crash dummy inside, dont worry).
2) A car moving 45 mi/h, with a mass of 1500 kg that slows to a stop at a yellow light.
Car 1 will experience a greater force. Both car 1 and car 2 experience the same change in momentum, therefore the same impulse. We know from the question the time allowed for. change in momentum is different (1 - small amount of time 2- bigger amount of time). Since Impulse is F*t, care 2 must experience a smaller force than car 1 in order to allow their impulses to be equal.
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