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 = 19 N and F_min = -13 N then calculate the impulse delivered to a 3-kg mass during the 5 seconds graphed above.
51.5 N sec-1 N sec-0.5 N sec-13.5 N sec38.5 N sec

		Question 2 If the object's initial velocity in Question 1 was 8.2 m/sec, what will be its final velocity at the end of these 5 seconds?
24.1 m/sec-8.4 m/sec2.6 m/sec3.7 m/sec8 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?
-2.7 N-0.1 N7.7 N3 N-2.5 N

		Question 4 A 8.2-gram bullet moving at 260 m/sec travels through a block of wood and emerges out the other side moving at 240 m/sec. If it takes 26.5 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?
7.43 x 10⁴ N1.55 x 10⁶ N-6.19 x 10³ N8.05 x 10⁴ N

		Question 5 During target practice, a man shoots a 8.2-gram bullet with a horizontal velocity of 240 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?
1.3 m/sec238.7 m/sec0.051 m/sec160 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?
0.47 m0.67 m0.87 m0.34 m1.23 m

		Question 7 A second 8.2-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 161 centimeters before coming to a stop. The coefficient of friction between the block and the table's surface is µ = 0.356. How much work will the friction between the table and block do on the block while bringing it to a stop?
5.3 J8.5 J3.3 J23.8 J57.3 J

		Question 8 How fast was the original bullet in Question 7 travelling before it struck the block?
397.1 m/sec335.7 m/sec425 m/sec269.8 m/sec617.5 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?

9.5 kg m/sec19 kg m/sec9 kg m/sec6.5 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?
0.2440.750.4150.1720.562