 Practice Problems Momentum and Energy

Directions: On this worksheet you will be investigating the relationships between momentum and energy. Question 1  If Fmax = 17 N and Fmin = -10 N then calculate the impulse delivered to a 3-kg mass during the 5 seconds graphed above. 42 N sec4 N sec-8 N sec32 N sec2 N sec Question 2  If the object's initial velocity in Question 1 was 7.1 m/sec, what will be its final velocity at the end of these 5 seconds? 3 m/sec23.3 m/sec7.8 m/sec-6.4 m/sec4.4 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? -1.6 N6.4 N10 N3.5 N0.4 N Question 4  A 7.1-gram bullet moving at 270 m/sec travels through a block of wood and emerges out the other side moving at 210 m/sec. If it takes 29.2 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? -1.46 x 104 N5.11 x 104 N6.57 x 104 N1.17 x 106 N Question 5  During target practice, a man shoots a 7.1-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? 0.99 m/sec140 m/sec209.01 m/sec0.051 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? 0.94 m0.67 m0.32 m0.2 m0.45 m Question 7  A second 7.1-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 164 centimeters before coming to a stop. The coefficient of friction between the block and the table's surface is µ = 0.361. How much work will the friction between the table and block do on the block while bringing it to a stop? 5.3 J24.2 J59.2 J3.3 J8.7 J Question 8  How fast was the original bullet in Question 7 travelling before it struck the block? 435 m/sec411.6 m/sec236.4 m/sec721.3 m/sec339.8 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 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? 0.8350.2250.6970.4740.369