Physics 11: Energy Practice Test 2011
Name __________________
1. Which variable expression is paired with a corresponding unit?
A. mass x distance/ time = Watt
B. mass x distance2/ time = Watt
C. mass x distance2/ time2 = Joule
D. mass x distance/ time3 = Joule
2. How much energy must be used to accelerate a 22 kg cart from a speed of 2.0 m/s to 4.0 m/s?
A. 44J
B. 132 J
C. 176 J
D. 220 J
3. In order to double the speed of an object, its kinetic energy must
A. stay the same
B. double
C. be cut in half
D. quadruple
4. A pile driver is raised to a height of 8 m. A pile driver of only half the mass must be raised to what height to have
the same amount of potential energy?
A. 1.5 m
B. 3 m
C. 16 m
D. 12 m
5. Three people of equal mass climb a mountain using paths A,B, and C shown in the diagram.
Along which path(s) does a person gain the greatest amount of gravitational potential energy from
start to finish?
A. A, only
B. B, only
C. C, only
D. all the same
6. A student rides a bicycle up a 30 m high hill at a constant speed of 6.00 m/s. The combined
mass of the student and bicycle is 70.0 kilograms. What is the kinetic energy of the
student-bicycle system during this ride?
A. 210. J
B. 420. J
C. 1,260 J
D. 20580 J
7. A cart of mass (m) traveling at speed (v) has kinetic energy EK. If the mass of the cart is
doubled and its speed is halved, the kinetic energy of the cart will be:
A. half as great
B. twice as great
C. one-fourth as great
D. four times as great
8. Two vacationers walk out on a horizontal pier as shown in the diagram below.
As they approach the end of the pier, their gravitational potential energy will
A. decrease
B. increase
C. remain the same
9. What is the change in SuperBrit's kinetic energy if SuperBrit (who has a mass of 500 kg) is
flying at 200 m/s but then rushes off at 300 m/s to save a hot guy in distress?
A. 10 000 000 J
B. 22 500 000 J
C. 12 500 000 J
D. -12 500 000 J
10. A 52 kg stove is pushed across the floor a distance of 3.0 m using a force of 26 N. How much work is done on the
stove?
A. 26 J
B. 78 J
C. 160J
D. 1500 J
11. A 1200 kg car is pushed along a 15 m long driveway using a 240 N applied force against a force of friction of 180
N. How much work is done on the car?
A. 900 J
B. 2700 J
C. 3600 J
12. Which of the following best describes "WORK"?
A. The rate at which force is used.
C. The rate at which power is used.
B. The exact opposite of energy.
D. The amount of force times the distance.
D. 6300 J
13. If 125 J of work is used to move a 12 kg ball using a force of 65 N, haw far will the ball travel?
A. 1.1 m
B. 1.9 m
C. 2.4 m
D. 10 m
14. What is the difference in the work done between a 100 N weight carried
100m horizontally at constant speed and a 100N weight lifted 100m vertically?
A. more work is done in the first case
B. more work is done in the second case.
C. same amount of wok is done in each case
D. no work is done in either case
15. A force is applied to a block, causing it to accelerate along a horizontal, frictionless surface.
The energy gained by the block is equal to the
A. Work done on the block
B. power applied to the block
C. impulse applied to the block
D. momentum given to the block
16. A 35kg ball is raised to a height of 15m and is then dropped. Half-way back to the ground its total energy is
A. 920 J
B. 1800 J
C. 3700 J
D. 5100 J
17. An elastic powered sling shot is able to supply a 0.250kg rock with 65 J of kinetic energy. How high will the rock
go if the sling shot is pointed straight up and friction is negligible?
A. 27 m
B. 54 m
C. 125 m
D. 260 m
18. A 5.0 kg rock is thrown into the air with an initial speed of 25 m/s. It reaches a maximum height of 21 m. What
is the speed of the rock at its maximum height?
A. 0 m/s
B. 11 m/s
C. 15 m/s
D. 18 m/s
19. As a rock falls, it
A. loses potential energy and gains kinetic energy.
C. gains both potential and kinetic energy.
B. loses kinetic energy and gains potential energy.
D. loses both potential and kinetic energy.
20. A pendulum bob of mass 5.0 kg is suspended from a hook by a string 3.5 m long. The bob is pulled until the cord
is horizontal and then is released. What is the speed of the bob at the bottom of its swing?
A. 8.3 m/s
B. 21 m/s
C. 46 m/s
D. 69 m/s
21. As shown in the diagram below, pulling a 9.8-newton cart a distance of 0.50 metres along a
frictionless plane inclined at 15 degrees requires 1.3 joules of work. If the cart were raised 0.50
metres vertically instead of being pulled along the inclined plane, and assuming no friction, the
amount of work done would be:
A. less
C. the same
B. greater
D. equal to the change in kinetic energy
22. The rate at which energy is transformed is called
A. work
B. momentum
C. power
23. Which of the following requires the most power?
A. running down 3 flights of stairs in 14 s .
C. climbing 2 flights of stairs in 6s
B. climbing 3 flights of stairs in 12 s
D. climbing one flight of stairs in 4s
D. energy consumption
24. One horse is capable of doing 1850 J of work in 2.5 s. What is the power of the horse?
A. 740 W
B. 1850 W
C. 46001N
D. 730 W
25. The diagram below shows a 1.0 x 103 newton crate to be lifted at constant speed from the
ground to a loading dock 1.5 meters high in 5.0 seconds. What power is required to lift the crate?
A. 1.5 x103 W
B. 2.0x102 W
C. 3.0 x102 W
D. 7.5 x103 W
26. A basketball player who weighs 600 newtons jumps 0.5 meters vertically off the floor. What
is her kinetic energy just before she hits the floor on her way back down?
A. 30 J
B. 60J
C. 300J
D. 600J
27. As the speed of a bicycle moving along a level horizontal surface changes from 2 meters per
second to 4 meters per second, the magnitude of the bicycle's gravitational potential energy
_______________ .
A. decreases
B. increases
C. does not change
D. is the same as the
kinetic energy
28. As the block moves from point A to point B, the total amount of gravitational potential energy
changed to kinetic energy is approximately
A. 5 J
B. 20 J
C. 50 J
D. 500
29. While orbiting Earth, the space shuttle has recorded temperatures ranging from 398 K to 118
K. These temperatures correspond to Celsius temperatures ranging from
A. 125°C to - 391°C B. 125°C to -155°C
C. 671°C to 391°C
D. 671°C to 155°C
30. What is the total amount of energy needed to change the temperature of 0.20 kilogram of lead
from 20.°C to 30.°C?
A. 0.26 kJ
B. 0.65 kJ
C. 0.84 kJ
D. 1.3 kJ
31. Which two quantities are measured in the same units?
A. mechanical energy and heat
B. energy and power
C. momentum and work
D. work and power
32. According to the kinetic molecular theory, which state's particles have the highest kinetic
energy
A. solid
B. plasma
C. Gas
D. liquid
Spring Displacement
Force (N)
30
20
10
0
0
2
4
6
Distance (cm)
8
10
33.
Use the graph to calculate the work done to stretch the spring a distance of 8.0 cm
34. Compare and contrast the terms temperature and thermal energy. (2 marks)
35. Which substance would hold its temperature longer: 1 kg of lead, 1 kg of copper or 1 kg of
iron? (1 mark)
36. Human body temperature is typically 37 degrees Celsius. What is this in Kelvin? (1 mark)
37. A 0.10 kg piece of copper metal at 88 degrees Celsius is placed inside a 0.100 kg container of
water at 24 degrees Celsius. What is the final temperature of both the copper and the water? (2
marks)
38. Give at least 1 reason why the heat capacity of water is such an important thing to life on
Earth. Explain your answer. (2 marks)
39. A 650-kilogram roller coaster car starts at the top of the first hill of its track and
glides freely. [Assume negligible friction.]
The car shown in the diagram was travelling at 6m/s at the top of the first hill. If that first hill is
68.7m high, and the third hill is 11.7m high, calculate the velocity of the car when it reaches the
top of the third hill. (3 marks)
40. It takes 1.0 x105 J for a kettle to heat up a 0.100 kg sample of water from 30° to 50°. What is the
efficiency of the kettle?