Momentum and Energy

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 = -13 N then calculate the impulse delivered to a 3-kg mass during the 5 seconds graphed above.
36.5 N sec49.5 N sec-15.5 N sec-2.5 N sec-5 N sec

		Question 2 If the object's initial velocity in Question 1 was 7.5 m/sec, what will be its final velocity at the end of these 5 seconds?
2.3 m/sec1.7 m/sec20 m/sec6.7 m/sec-8.3 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?
-0.5 N7.3 N2 N-3.1 N-12.5 N

		Question 4 A 7.5-gram bullet moving at 290 m/sec travels through a block of wood and emerges out the other side moving at 230 m/sec. If it takes 26 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?
1.5 x 10⁶ N-1.73 x 10⁴ N8.37 x 10⁴ N6.63 x 10⁴ N

		Question 5 During target practice, a man shoots a 7.5-gram bullet with a horizontal velocity of 230 m/sec at a 1.5-kg wooden block balanced on the top of a 1.3-meter tall fence post. If the bullet embeds in the block, how fast will the block-bullet be knocked off the post?
153.33 m/sec0.049 m/sec228.86 m/sec1.14 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?
0.3 m0.83 m0.42 m1.18 m0.59 m

		Question 7 A second 7.5-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 179 centimeters before coming to a stop. The coefficient of friction between the block and the table's surface is µ = 0.38. How much work will the friction between the table and block do on the block while bringing it to a stop?
10 J26.4 J3.1 J68 J5.6 J

		Question 8 How fast was the original bullet in Question 7 travelling before it struck the block?
267.7 m/sec500 m/sec364.2 m/sec437.1 m/sec732.1 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 13 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?

6.5 kg m/sec9.5 kg m/sec9 kg m/sec19 kg m/sec3 kg m/sec

		Question 10 Within the system, what fraction of the 1-kg ball's original KE remains after the collision?
0.5620.4150.1720.2440.75