PhysicsLAB Practice Problems
Momentum and Energy

Directions: On this worksheet you will be investigating the relationships between momentum and energy.

Question 1  If Fmax = 16 N and Fmin = -10 N then calculate the impulse delivered to a 3-kg mass during the 5 seconds graphed above.

Question 2  If the object's initial velocity in Question 1 was 7.6 m/sec, what will be its final velocity at the end of these 5 seconds?
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?
Question 4  A 7.6-gram bullet moving at 280 m/sec travels through a block of wood and emerges out the other side moving at 210 m/sec. If it takes 28.5 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?
Question 5  During target practice, a man shoots a 7.6-gram bullet with a horizontal velocity of 210 m/sec at a 1.5-kg wooden block balanced on the top of a 1-meter tall fence post. If the bullet embeds in the block, how fast will the block-bullet be knocked off the post?
Question 6  After being knocked off, how far from the base of the fence post will the block in Question 5 hit the ground?
Question 7  A second 7.6-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 172 centimeters before coming to a stop. The coefficient of friction between the block and the table's surface is µ = 0.367.

How much work will the friction between the table and block do on the block while bringing it to a stop?
Question 8  How fast was the original bullet in Question 7 travelling before it struck the block?
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 10 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?
Question 10  Within the system, what fraction of the 1-kg ball's original KE remains after the collision?

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