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Momentum Madness
j =
= j
m
1
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1,i
+ m
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f
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1,i
+ m
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2,i
= m
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m
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1
.
An ostrich with a mass of 146 kg is running to the right with a velocity of 17 m/s.
Find the momentum of the
ostrich.
2. A 21 kg child is riding a 5.9 kg bike with a velocity of 4.5 m/s to the northwest.
A. What is the total momentum of the child and the bike together?
B. What is the momentum of the child?
C. What is the momentum of the bike?
3. What velocity must a car with a mass of 1210 kg have in order to have a momentum of 5.6 X 10
4
kg*m/s to
the east?
4. Consider a soccer ball (m = 1.2 kg) traveling east with a velocity of 10 m/s that is kicked so that its new
velocity is 12 m/s west.
What is the change in the momentum of the ball?
5. What average net force must be applied to stop the truck (m = 10,000 kg) traveling 36 m/s south in 1.2
seconds?
6. A tennis ball (m = 0.5 kg) strikes and hits a wall as shown.
If the velocity with which it strikes the wall is 12
m/s, and the velocity with which it returns from the wall is 12 m/s, find
(a)
The change in momentum (impulse imparted to ball) by the wall.
(b)
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 Spring '11
 Matthews
 Biology, Force, Kinetic Energy, Mass, Momentum, m/s

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