Practice Problems
Momentum and Energy
Directions:
On this worksheet you will be investigating the relationships between momentum and energy.
Question 1
If F
max
= 17 N and F
min
= -12 N then calculate the impulse delivered to a 3-kg mass during the 5 seconds graphed above.
-2 N sec
35 N sec
-13 N sec
47 N sec
-1 N sec
Question 2
If the object's initial velocity in
Question 1
was 6.5 m/sec, what will be its final velocity at the end of these 5 seconds?
-6.8 m/sec
2.2 m/sec
1.8 m/sec
6.2 m/sec
18.5 m/sec
Question 3
What was the magnitude of the average force acting on the 3-kg mass in
Question 1
during the 5 seconds displayed on the graph?
-0.2 N
2.5 N
-5 N
7 N
-2.6 N
Question 4
A 6.5-gram bullet moving at 290 m/sec travels through a block of wood and emerges out the other side moving at 200 m/sec. If it takes 26.9 µsecs (1 µsec = 1 x 10
-6
seconds) for the bullet to bore through the wood, what average force did the wood exert on the bullet?
1.18 x 10
6
N
7.01 x 10
4
N
4.83 x 10
4
N
-2.17 x 10
4
N
Question 5
During target practice, a man shoots a 6.5-gram bullet with a horizontal velocity of 200 m/sec at a 1.5-kg wooden block balanced on the top of a 1.2-meter tall fence post. If the bullet embeds in the block, how fast will the block-bullet be knocked off the post?
0.049 m/sec
0.86 m/sec
133.33 m/sec
199.14 m/sec
Question 6
After being knocked off, how far from the base of the fence post will the block in
Question 5
hit the ground?
0.7 m
0.43 m
0.21 m
0.99 m
0.3 m
Question 7
A second 6.5-gram bullet is fired at another 1.5-kg block which is initially at rest on a table. The bullet embeds in the block resulting in the block sliding 153 centimeters before coming to a stop. The coefficient of friction between the block and the table's surface is µ = 0.362.
How much work will the friction between the table and block do on the block while bringing it to a stop?
3.5 J
5.3 J
8.2 J
55.4 J
22.6 J
Question 8
How fast was the original bullet in
Question 7
travelling before it struck the block?
406.1 m/sec
210.2 m/sec
764.7 m/sec
410 m/sec
329.9 m/sec
Question 9
As shown in the diagrams provided below, a ball of mass 1 kg is originally moving along the x-axis with a velocity of 12 m/sec towards the origin. As it approaches the origin, it delivers a glancing blow to a stationary 2-kg mass. After the collision, the 1-kg ball continues traveling towards the left, into the second quadrant, at a reduced speed of 5 m/sec at an angle of 37º above the negative x-axis.
What is the final momentum of the 2-kg mass after the collision?
3 kg m/sec
17 kg m/sec
6 kg m/sec
8 kg m/sec
8.5 kg m/sec
Question 10
Within the system, what fraction of the 1-kg ball's original KE remains after the collision?
0.424
0.18
0.771
0.594
0.266
PhysicsLAB
Copyright © 1997-2023
Catharine H. Colwell
All rights reserved.
Application Programmer
Mark Acton