Download Unit 3 Test: Energy and Momentum

Unit 3 Test: Energy and Momentum
Choose the best answer. Do not write on the test booklet
Good luck!
1. The energy of motion is called:
A. Gravitational Energy
C. Elastic Energy
B. Kinetic Energy
D. None of the above
2. An example of chemical energy is:
A. The energy stored in food
C. The energy in a falling weight
B. The energy in a rolling rock
D. None of the above
3. If 800 J of work are done by a 100 N force, over what distance does the force act?
A. 200 m
B. 80,000 m
C. 0.125 m
D. None of the above
4. What force is required to do 3500 J of work over a distance of 70 m?
A. 50 N
B. 500 N
C. 245,000 N
D. None of the Above
5. If 30 N of force pushes a block 20 m, how much work is done?
A. 1.5 J
B. 0.66 J
C. 600 J
D. None of the above
6. The tendency of an object to resist changes to its motion best defines:
A. Energy
B. Momentum
C. Work
D. None of the above
7. How much energy does a 1000 kg car have if it is traveling at 20 m/s?
A. 2 x 105 J
B. 1.96 x 105 J
C. 1 x 104 J
D. None of the Above
8. If a 3000 kg wooden rabbit is pushed so that it goes from rest to a velocity of 4 m/s,
how much work was done on the rabbit?
A. 117600 J
B. 12000 J
C. 24000 J
D. None of the Above
9. If 10 J of work is done on an object, what will be the change in the energy it possesses?
A. 10 J
B. 98 J
C. 0 J
D. None of the above
10. If a 2 kg cantaloupe has 9 J of work done on it. How much does its velocity increase?
A. 18 m/s
B. 4.5 m/s
C. 3 m/s
D. None of the above
11. A 4 kg bowling ball rolls down a hill which is 15 m high. If it has a velocity of 10
m/s at the bottom of the hill how much work was done on the ball by friction or other
forces?
A. 40 J
B. 60 J
C. 150 J
D. None of the Above
12-16. A 0.5 kg pendulum is released from a height of 0.4 m.
12. What is the maximum potential energy of the pendulum?
A. 0.2 J
B. 1.96 J
C. 0.04J
D. None of the Above
13. What is the Kinetic Energy of the pendulum at the bottom of its path?
A. 0.2 J
B. 1.96 J
C. 0.04J
D. None of the Above
14. What is the velocity of the pendulum at the bottom of its path?
A. 1.96 m/s
B. 0.4 m/s
C. 7.84 m/s
D. None of the Above
15. How much potential energy does the pendulum have when it is at a height of 0.2 m?
A. 0.10 J
B. 0.98 J
C. 3.92 J
D. None of the Above
16. What is the velocity of the pendulum when it is 0.2 m above the lowest point on its
path?
A. 1.98 m/s
B. 1.40 m/s
C. 2.80 m/s
D. None of the Above
17-20. While on a training flight Ms. Hasselbring drops her Pez Dispenser (m = 0.001
kg) out of an airplane. If the airplane was flying at an altitude of 1 million m (1 x 106 m):
17. What is the gravitational potential energy of the Pez dispenser?
A. 5 x 108 J
B. 0.0049 J
C. 9800 J
D. None of the above?
18. Right before the Pez Dispenser hits the ground, how much Gravitational Potential
Energy does it have?
A. 5 x 108 J
B. 0.0049 J
C. 9800 J
D. None of the above?
19. If we are in physics land (no terminal velocity) what is the velocity of the Pez
dispenser right before it hits the ground?
A. 4427 m/s
B. 2.214 m/s
C. 54 m/s
D. None of the Above
20. What is the velocity of the pez dispenser when it is 9 x 105 m above the ground?
A. 1.96 x 106 m/s
B 1.4 x 103 m/s
C. 54 m/s
D. None of the Above
21. An armadillo and an elephant are racing each other. If they start out at the same
speed, then which has more kinetic energy?
A. The Elephant
B. The Armadillo
C. Mr. Baden
D. They have the same KE
22-25. Give the following a rank in order of kinetic energy from lowest to highest if they
are all traveling at the same speed. Unicycle, Mack Truck, Motorcycle, and 4 door sedan
(1 means the lowest KE, 4 is the highest KE), you should use each number once over the
next 4 questions.
22. Unicycle
A. 1
C. 3
B. 2
D. 4
23. Mack Truck, with loaded trailer.
A. 1
C. 3
B. 2
D. 4
24. Motorcycle
A. 1
C. 3
B. 2
D. 4
25. Standard 4 door car.
A. 1
C. 3
B. 2
D. 4
26. A family of 4 is standing at the edge of the Grand Canyon. Pick the correct order of
their potential energies from smallest to largest (Assume that each member is average
sized for their age and gender).
A. Father, Mother, 10 year old son, 1 year old daughter
B. 10 year old son, Father, 1 year old daughter, Mother
C. 1 year old daughter, 10 year old son, Mother, Father
D. None of the above.
27. In the energy conservation/ energy conversion lab (with the pipe insulation and the
marble) what caused the marble to not go back to its starting height?
A. Didn’t start with enough energy
B. Lost energy due to friction
C. Gained energy while it rolled.
D. None of the above
28. Which is the best example of elastic potential energy?
A. A coiled spring
B. Gasoline
C. A book on the edge of a table
D. All of the above.
29-30. For the next two questions refer to the following graph of a pendulum’s energy vs.
time.
29. At which point on the graph is the pendulum at its highest point?
A. A
B. B
C. C
D. D
30. At which point does the pendulum have its greatest velocity?
A. A
B. B
C. C
D. D
31. A 6 kg hawk swoops down at its prey with a velocity of 20 m/s, when it is 8 m above
the ground how much total energy does it have?
A. 1670.4 J
B. 1200.0 J
C. 1176.0 J
D. None of the above
32. How much momentum doe s 30 kg dog have if it is running at 5 m/s?
A. 6 Ns
B. 0.166 Ns
C. 150 Ns
D. None of the above
33. How much momentum does a 100 kg refrigerator have if it is falling at a velocity of
10 m/s?
A. 100 Ns
B. 10 Ns
C. 10,000 Ns
D. None of the above
34. A 60 kg skateboarder is on her board, not moving relative to the ground, when she
throws a 10 kg medicine ball with a velocity of -5 m/s what is the velocity of the
skateboarder?
A. 6.0 m/s
B. 0.83 m/s
C. 10.0 m/s
D. None of the Above
35. If the space shuttle (mass = 9,900 kg, carrying a 100 kg gas canister; total mass =
10,000 kg ) is floating forward at 3 m/s what velocity would 100 kg of gas have to be
shot forward with to stop the shuttle’s motion?
A. 300 m/s
B. 30,000 m/s
C. 29,700 m/s
D. None of the above
36. A bus takes longer to stop than a car because it has ______________ momentum than
a car.
A. Less
B. More
C. The same
D. momentum
37. The longer stopping time for buses means that seatbelts aren’t as important because:
A. High seats prevent whiplash
B. Longer stopping time spreads out the force of impact, keeping riders in their seats
C. Buses don’t get hit as hard in accidents
D. None of the above
38. A 5 kg bowling ball (A) is rolled (with a velocity of 7.5 m/s) into an identical bowling
ball (B) which is not moving. What is the resulting velocity of bowling ball B?
A. 0 m/s
B. 37.5 m/s
C. 7.5 m/s
D. None of the Above
Use the following information to answer questions 39-40
In space Asteroid Ketchup has a mass of 200 kg and is traveling at 15 m/s when it hits
Asteroid Mustard which has a mass of 300 kg and is traveling in the same direction at 6
m/s.
39. What is the momentum of the system, of Ketchup and Mustard, before they hit each
other?
A. 3000 Ns
B. 1800 Ns
C. 4800 Ns
D. None of the above
40. After the collision Asteroid Mustard has a velocity of 8 m/s, what is the velocity of
Asteroid Ketchup at that time?
A. 24 m/s
B. 3 m/s
C. 8 m/s
D. None of the Above
41. Impulse is _____________ multiplied by ____________.
A. Momentum, Force
B. Force, Time
C. Mass, Velocity
D. None of the Above
42. If a llama feels an impulse of 55 Ns applied to it, what will its momentum change by?
A. 5 Llamas
B. 55 Ns
C. 0 Ns
D. None of the Above
43. 8 dogs pull a 100 kg sled with a force of 160 N for 45 s. What is the change in
velocity of the sled?
A. 800 m/s
B. 12.5 m/s
C. 72 m/s
D. None of the Above
44. If you want to accelerate an 800 kg car from rest to 10 m/s in 20 s, how much force
do you need to apply to it?
A. 400 N
B. 800 N
C. 8000 N
D. None of the Above
45. A falling object’s potential energy becomes kinetic energy as it loses altitude and
gains speed. This is an example of:
A. Energy Transfer
B. Energy Flow
C. Energy Transformation
D. None of the Above
46. When a sliding objects slows down because it is losing energy due to friction, what
form is the lost energy taking?
A. Motion
B. Heat
C. Light
D. None of the above
47. Terminal Velocity is:
A. A fatal illness
B. A way to transfer energy
C. The highest speed an object will fall at
D. None of the above
48. According to the First Law of Thermodynamics if object A is in equilibrium with
object B; and Object B is in equilibrium with Object C then:
A. Entropy Increases
B. Absolute Zero is the lowest possible temperature
C. A is in Equilibrium with C
D. None of the above
49. Entropy is:
A. A measure of disorder
C. A measure of heat
B. A measure of temperature
D. None of the Above
50. A Rube Goldberg machine includes:
A. Energy Transfers
C. Multiple Steps
B. Energy Transformations
D. All of the Above