Dr. Bullock
2.54 centimeter = 1 inch
1 kilometer = 0.62 mile
5280 feet = 1 mile
1 yard = 36 inches
TEST 3-A
PHSC 1013 Physical Science
F = p/t
KE = ½ mv2
PE = mgh
3
1 cm water = 1 gram
 = mass/Volume
F = ma
aC = v2/r
True/False (A=True, B=False)
1. Momentum is a conserved quantity (that remains unchanged) in all types of collisions.
2. Energy consumed due to air resistance would be classified as a “reversible process”.
3. Kinetic energy is the energy associated with an objects position or configuration.
4. Work and energy are both measured in units called “Joules”.
5. In elastic collisions the objects tend to rebound from one another.
6. Potential energy is a vector quantity.
7. Newton was the first to propose the idea that the total motion of the universe was constant.
8. In inelastic collisions the objects tend to stick together after the collision.
9. Energy is sometimes lost during a process.
10. In terms of energy, friction is considered an irreversible process.
11. Momentum is a vector quantity
12. The only way to change an objects momentum is to change it’s velocity
Multiple Choice (Choose the best possible answer)
13. What is the momentum of a baseball (mass = 1 kg) thrown at a speed of 40 m/s?
a) 1 kg m/s
b) 40 kg m/s
c) 0.4 kg m/s
d) 40 m/s
e) 1 m/s
14. A stick of dynamite explodes. The pieces (each with a mass of 0.5 kg) of dynamite fly with a
speed of 50 m/s. What is the total momentum after the explosion?
a) 25 kg m/s
b) 0.5 kg m/s
c) 50 kg m/s
d) 0.01 kg m/s
e) 0 kg m/s
15. An object with mass, m travels at a speed v. The same object now travels with speed v/2. What
has happened to the object’s kinetic energy?
a) Increased by a factor of 2
b) Decreased by a factor of 2
c) Unchanged
d) Increased by a factor of 4
e) Increased by a factor of 6
Dr. Bullock
TEST 3-A
PHSC 1013 Physical Science
For the swinging pendulum pictured at right
16. At what position(s) would it have the
greatest kinetic energy?
a) A b) B c) C d) D e) E
17. At what position(s) would it have the
greatest potential energy?
a) A b) B c) A,E
d) B,D
g
E
e) C
18. At what position(s) would it have the
maximum total energy?
a) A,E
b) D,B
c) C d) D,C,B
A
D
B
C
e) all positions
19. At what position(s) would it have the greatest speed?
a) A, E
b) D,B
c) C d) D,C,B
e) all positions
20. A lump of crud (mass = 10 kg) flies through the air with an initial velocity of 80 m/s and slams
into an initially stationary lump of goo (mass 30 kg). If they stick together afterwards, what is
the new velocity of the wad of crud and goo?
a) 20 m/s
b) 40 m/s
c) 60 m/s
d) 10 m/s
e) 4 m/s
21. A freight car weighs 5 times as much as a train engine. If the engine coasts at 12 km/hr and
collides into the stationary freight car, how fast are they traveling after they couple together?
a) 0 km/hr
b) 1 km/hr
c) 2 km/hr
d) 5 km/hr e) 6 km/hr
Consider the following situation pictured at the right.
A 100 kg roller coaster cart is 20 meters above the
ground on a frictionless track before its initial dive.
22. At which point on the diagram does the cart have it’s maximum
potential energy? a) A b) B c) C
A
B
C
23. At which point on the diagram does the cart have it’s maximum
kinetic energy? a) A
b) B c) C
24. At which point on the diagram does the cart have a combination of both potential and kinetic
energy? a) A b) B c) C
25. Its total gravitational potential energy at the top of the track is:
a) 100 Joules
b) 2000 Joules c) 20000 Joules d) 6000 Joules
e) 5 Joules
26. Its total kinetic energy at the bottom of the dive is:
a) 100 Joules
b) 2000 Joules c) 20000 Joules d) 6000 Joules
e) 5 Joules
PHSC 1013 Physical Science
Dr. Bullock
27. Its speed at the bottom is of the dive is:
a) 10 m/s
b) 14.1 m/s c) 20.0 m/s
d) 44.7 m/s
TEST 3-A
e) 55.2 m/s
28. Six balls hang from strings pictured below. How many balls will fly out to the right when the
two balls on the left collide at the bottom of their swing?
a) none
b) one
c) two
d) three
e) four
2m
m
m
m
m
m
29. A 1000 kg roller coaster starts from rest at the top of a 20 meter hill and slides without
friction through the bottom of a curve before rising over a 12 meter hill. What is its kinetic
energy at the crest of the second hill?
a) 80,000 J b) 78,400 J c) 627,200 J d) 96,000 J e) 108,000 J
30. Momentum depends upon...
a) mass and velocity
b) mass and acceleration
c) force and distance
d) mass and distance
e) mass and time
31. Starting from rest which car has the high speed at the bottom of the hill? (NOTE: Both
masses start from the same height) (mA > mB , B > A ) (a) Block A (b) Block A and Block B have the
same speed (c) Block B (d) Need more information (e) none of these
mB
mA
h
A
B
32. A 1 kg pool ball travels at 10 m/s, East across a pool table and has a perfectly elastic collision
with another pool ball of the same mass. At what velocity does the SECOND ball travel after the
collision?
a) 10 m/s, East b) 10 m/s, West
c) 8 m/s, East
d) 8 m/s, West
e) 0 m/s
Dr. Bullock
PHSC 1013 Physical Science
TEST 3-A
33. A 1 kg pool ball travels at 10 m/s, East across a pool table and has a perfectly elastic collision
with another pool ball of the same mass. At what velocity does the FIRST ball travel after the
collision?
a) 10 m/s, East b) 10 m/s, West
c) 8 m/s, East
d) 8 m/s, West
e) 0 m/s
34. A 100 kg rifle recoils with a speed of 10 m/s when a 100 g bullet is fired from the muzzle. At
what speed must the bullet be traveling?
a) 370 m/s
b) 10 m/s
c) 100 m/s
d) 1,000 m/s
e) 10,000 m/s
35. If the input energy of the above process is 100 J and the output energy is 32 J what is the
“Actual Efficiency” of the process?
a) 68%
b) 132%
c) 3.125%
d) 32%
e) none of these
36. If a push a Big Mac (mass = 0.5 kg) with a force of 2 N a distance of 10 m how much work have
I done?
a) 50 J
b) 5 J
c) 20 J
d) 1 J
e) 10 J
37. How far would I have to push (with a 2 N force) a Big Mac in order to burn to 600 calories
(note 600 calories = 2,511,600 J)?
a) 1,255,800 m
b) 1,200 m
c) 300 m
d) 5,023,200 m
e) 4,186 m
38. Your left hand lifts a 2-N apple by 1.5 m, and your right hand lifts a 4-N grapefruit by 0.5 m.
Which hand did the most work?
a) Left hand
b) Right hand
39. If you triple your altitude above the ground, how is your gravitational potential energy
affected?
a) no effect
b) increases by a factor of three
c) decreases by a factor of three
d) increases by a factor of nine
e) decreases by a factor of nine
** Matching (match the term numbered at left with a definition lettered at right)
40. F= p/t
41. kg m/s
42. Ft
43. heat due to friction
a) exhaust
b) Units of work
c) Newton’s 2nd Law
d) Units of Momentum
e) Impulse
Dr. Bullock
PHSC 1013 Physical Science
TEST 3-A
** Matching (match the term numbered at left with the order-of-magnitude estimate
lettered at right)
44. Annual US energy use
45. Human food intake/day
46. Melting an ice cube
a) 1019 J
b) 10-7 J
c) 104 J
d) 107 J
e) 1 J
47. Lifting a baseball two feet
48. Hop of a flea
** Specify which type of energy the following terms are associated with
( A-Potential Energy
B-Kinetic Energy)
49. Rotational
50. Nuclear
51. Chemical
52. Translational
53. Gravitational
54. Thermal
55. Electromagnetic
56. Elastic
** Specify whether the process id reversible or irreversible
( A – reversible
B – irreversible)
57. Rotational
58. Translational
59. Gravitational
60. Thermal from friction
61. Sound
62. Exhaust
63. The rate of energy flow is known as
a) potential energy
b) kinetic energy
c) power
d) energy transfer
e) river energy
Dr. Bullock
PHSC 1013 Physical Science
TEST 3-A
64. The ability to do work is known as
a) power
b) force
c) energy
d) mass
e) time
65. A block slides on a frictionless, horizontal surface with a speed v until it encounters a spring.
The block compresses the spring a certain distance, d. When the spring expands again the block’s
speed will be (a) less than v (b) equal to v (c) more than v (d) need more information (e) none of
these
66. Suppose rain falls vertically into an open cart rolling along a straight horizontal track with
negligible friction. As a result of the accumulating water, which happens?
(a) speed decreases, momentum unchanged, and kinetic energy decreases
(b) speed decreases, momentum unchanged, and kinetic energy increases
(c) speed unchanged, momentum unchanged, and kinetic energy unchanged
(d) speed unchanged, momentum decreases, and kinetic energy decreases
(e) None of these
67. An object initially at rest breaks into two pieces as the result of an explosion. One piece has
four times the kinetic energy of the other piece. What is the ratio of the masses of the two
pieces?
(a)1/2 (b) 1/4 (c) 1/8 (d) 1/16 (e) none of these
68. A person attempts to knock down a large wooden bowling pin by throwing a ball at it. The person
has two balls of equal size and mass, one made of rubber and the other made of putty. The rubber
ball bounces back, while the ball of putty sticks to the pin. Which ball is most likely to topple the
bowling pin?
(a) the rubber ball (b) the ball of putty (c) makes no difference (e)need more information
69. Light carries momentum, so when a beam impinges on a surface, it will exert a force on that
surface. If the light is reflected rather than absorbed, the force will be (a) less (b) greater (c)
equal either way (d) not enough information (e) none of these
70. Which test do you have?
a) A
b) B
c) C