Test - Unit 3 - Energy and Momentum
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Unit 3 Test: Energy and Momentum Physics 11 Advanced Multiple Choice: Circle the most correct answer. 1. Work is not energy itself, but rather: a. It is a form of kinetic energy b. It is a form of gravitational potential energy c. It is a force d. It is a transfer of mechanical energy e. It is a result of parallel forces 2. Which of the following is equivalent to a joule (J)? a. b. c. d. e. both b. and c. 3. Work done is zero when: a. An applied force does not result in any motion b. Uniform motion exists in the absence of a form c. The applied force is perpendicular to the displacement d. Both a. and c. e. All of the above 4. You throw a rock straight up into the air. While it rises and then falls, its kinetic energy: a. Remains constant b. Increases steadily c. Changes direction only d. Decreases then increases e. Increases then decreases
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Physics 11 ADV. J. Rushton, Class of 2014
Transcript of Test - Unit 3 - Energy and Momentum
Unit 3 Test: Energy and MomentumPhysics 11 Advanced
Multiple Choice: Circle the most correct answer.
1. Work is not energy itself, but rather:a. It is a form of kinetic energyb. It is a form of gravitational potential energyc. It is a forced. It is a transfer of mechanical energye. It is a result of parallel forces
2. Which of the following is equivalent to a joule (J)?a.
b.
c.
d.
e. both b. and c.
3. Work done is zero when:a. An applied force does not result in any motionb. Uniform motion exists in the absence of a formc. The applied force is perpendicular to the displacementd. Both a. and c.e. All of the above
4. You throw a rock straight up into the air. While it rises and then falls, its kinetic energy:
a. Remains constantb. Increases steadilyc. Changes direction onlyd. Decreases then increasese. Increases then decreases
5. When the velocity of an object is doubled, its ___________ is also doubled:a. Accelerationb. Kinetic energyc. Massd. Momentume. Potential energy
Constructed Response: Show all work to receive full value.
6. A 55kg cyclist travelling at 12m/s on a 7.5kg bike brakes suddenly and slide to a stop in 3.5m.
a. Calculate the work done by friction to stop the cyclist.
b. Calculate the coefficient of friction between the skidding tires and the ground.
7. A 60.0kg Olympic athlete is running down a race track at 12.5m/s[E] and collides head-on with a 75kg overly excited fan. Both people come to a complete stop on impact.
a. What is the momentum of the Olympic athlete before the collision?
b. What is the change in the Olympic athlete’s momentum?
c. What is the change in the fan’s momentum?
d. What is the fan’s velocity before the collision?
8. A 3.00kg mass is attached to one end of a spring on a horizontal, frictionless surface. The other end of the spring is attached to a wall. The spring has a spring constant of 80.0N/m and is stretched 25.0cm past it’s equilibrium position and then released.
a. What is the total energy of the mass-spring system?
b. What is the velocity of the mass when it passes the equilibrium position?
c. What is the elastic potential energy stored in the spring when the mass passes a point that is 14.5cm past its equilibrium position?
d. What is the velocity of the spring when it passes a point that is 14.5cm from its equilibrium position?
9. A 55kg woman is sitting in the truck of a car, trying to find her hockey gear. If she finds the 5.5kg bag of gear and throws it out of the trunk with a velocity of 15m/s, calculate the resulting velocity of the car, assuming that it was initially at rest. The mass of the car is 580kg.
10. A 3.2kg bowling ball is thrown down a 5m hallway and gets stuck in a 12kg wooden block (assume that friction is negligible between the bowling ball and the floor). If the coefficient of kinetic friction between the wooden block and the floor is 0.25, and the impact sends the wooden block 6.0m down the hallway before coming to rest, what was the initial speed of the bowling ball?
