Momentum :
p = mv
Directions: show ALL wo
rk on a separate sheet of paper. Answers are in italicized parenthesis so you can check
your work.
1)
What is the
momentum
of a 2 kg ball that is traveling at 2 m/s?
(4 kgm/s)
2)
What is the
momentum
of a 2
.5
kg ball t
hat is traveling at 5 m/s?
(12.5 kgm/s)
3)
What is the
p
of a 10 kg ball that is traveling at 5 m/s?
(50 kgm/s)
4)
What is the
p
of a 1
.
4 kg ball that is traveling at 6
m/s?
(8.4 kgm/s)
5)
How fast must a 3 kg object be moving to have a momentum of 15 kgm/s?
(5 m/
s)
6)
What is the velocity of
a 9 kg
with
a momentum of
–
13.5 kgm/s?
(
–
1.5 m/s)
7)
What is the mass of an object moving at 5.5 m/s with a momentum of 66 kgm/s?
(12 kg)
8)
What is the
mass of an object moving at
–
51 m/s with a momentum of
–
744
kgm/s?
(14.59 kg)
9)
A 2
kg ball has a momentum of
25 kgm/s. What is the ball’s speed?
(12.5 m/s)
10)
Your brother’s mass is 40 kg and he is riding on a 1.3 kg skateboard at
8.5 m/s. What is the total p
?
(351.05 kgm/s)
11)
Which would have more inertia, a 3 kg ball traveling at 10 m/s o
f a 6 kg ball traveling at 3 m/s?
12)
How could a 40,000 lb truck have the same momentum as a 4,000 lb car?
13)
How could a 180 lb running back have more momentum than a 320 lb lineman?
14)
A 91 kg running back moving at 7.1 m/s runs into a 142 kg lineman moving at 3.
4 m/s. Who wins
the tackle?
Impulse =
Change in Momentum I=Ft OR I=m
Δv
15)
What is the change in momentum of a 3 kg object accelerating from rest to 12 m/s?
(36 kgm/s)
16)
What is the
impulse
of a 4 kg object accelerating from 10 m/s to 12 m/s?
(8 kgm/s)
17)
What is the change in momentum of a 13 kg object accelerating from 20 m/s
to 12 m/s?
(
–
104 kgm/s)
18)
A hockey player shoots, exerting a force of 1844.3 N for 0.16 s on the puck. What is the impulse?
(295.09 Ns)
19)
A net force of 100 N is applied to a wagon for 5 s, what is the change in momentum of the wagon?
(500 Ns
)
20)
A net force of
242.1 N is applied to a wagon for 0.6 s, what is the change in momentum of the
wagon?
(145.26Ns)
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