Download Circular Motion Practice Quiz

Name: ______________________
Class: _________________
Date: _________
ID: A
Circular Motion Practice Quiz
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Which has greater linear speed, a horse near the
outside rail of a merry-go-round or a horse near
the inside rail?
a. The inside horse
b. The outside horse
c. Neither—they both have the same linear
speed.
6. A car travels in a circle with constant speed. The
net force on the car
a. is zero because the car is not accelerating.
b. is directed forward, in the direction of travel.
c. is directed toward the center of the curve.
d. none of the above
2. What is the direction of the force that acts on
clothes in the spin cycle of a washing machine?
a. Inward
b. Down
c. Outward
d. Up
7. The centripetal force exerted on stunt
motorcyclist Biker Bob while riding on the inner
vertical surface of a circular track is
a. friction.
b. his weight.
c. the normal force.
d. none of the above
3. A tin can whirled on the end of a string moves in
a circle because
a. the can continually pulls on the string.
b. once the can starts moving, that is its natural
tendency.
c. there is a force on the can pulling it outward.
d. there is an inward force acting on the can.
e. all of the above
8. Earth rotates and revolves through space. Earth
rotates about the ______ , which is an ______
axis. Earth revolves about the ______, which is
an _______ axis.
a. sun, external, North/South pole, internal
b. North/South pole, external, sun, internal
c. sun, internal, North/South pole, external
d. North/South pole, internal, sun, external
4. If you whirl a tin can on the end of a string and
the string suddenly breaks, the can will
a. fly directly away from you.
b. fly off, tangent to its circular path.
c. fly directly toward you.
d. spiral in toward your hand.
e. spiral away from your hand.
9. A small car is being driven in a circular path at
constant speed on a horizontal surface. What is
the direction of the frictional force that keeps
the car from skidding as it travels along this
path?
a. opposite the direction of the velocity of the
car
b. in the same direction as the velocity of the
car
c. toward the center of the circle
d. outward from the center of the circle
5. A ladybug rests on the bottom of a tin can that is
being whirled horizontally on the end of a string.
Since the ladybug, like the can, moves in a circle,
there must be a force on it. What exerts this
force?
a. Gravity
b. The string
c. There is no force acting on it.
d. The can
e. Your hand
1
10. A communication satellite is in a circular orbit
around Earth. If the speed of the satellite is
constant, the force acting on the satellite
a. is zero.
b. is decreasing.
c. points toward the center of the Earth at all
times.
d. points in the direction that the satellite is
moving.
13. Applying a force to an object perpendicular to its
direction of motion will cause the object to
a. change speed but not direction
b. change direction but not speed
c. change the magnitude of its acceleration
d. not change its speed or direction
14. An object moves in a circle with a period of
0.025 hours. What is its frequency in Hz?
a. 90 Hz
b. 263 Hz
c. 0.1 Hz
d. 0.01 Hz
11. A satellite moving in a circular orbit around
Earth and maintaining a constant speed will
experience a
a. changing gravitational force towards Earth.
b. net gravitational force towards Earth.
c. changing acceleration away from Earth.
d. net acceleration away from Earth.
15. After closing a deal with a client, Kent leans back
in his swivel chair and spins around with a
frequency of 0.8 Hz. What is the period of
Kent’s spin?
a. 0.8 s
b. 2 Hz
c. 1.25 s
d. 1 Hz
12. Decreasing the mass of an object on a circular
path but keeping its velocity and radius constant
a. increases the centripetal force on the object
b. decreases the centripetal force on the object
c. does not affect the centripetal force on the
object
d. depends on the specific situation
Problem
16. A toy airplane at the end of a string 0.8 m long
moves in a circle on a table. The airplane has a
mass of 1.7 kg and the string has a breaking
tension of 37 N. Calculate the maximum speed
the cart can attain without breaking the string.
19. A cement mixer of radius 2.5 m turns with a
frequency of 0.020 Hz. What is the centripetal
acceleration of a small piece of dried cement
stuck to the inside wall of the mixer?
20. Jessica is making a chocolate milkshake in a
blender. A tiny, 0.0050 kg chocolate chip is
rapidly spun around the inside of hte container
witha speed of 14 m/s, held by a centripetal force
of 10 N. What is the radius of the blender at this
location?
17. What is the centripetal acceleration keeping 13
kg mass moving in a circle of radius 0.4 m at a
speed of 8 m/s?
18. A CD 25 cm in diameter rotates 35 times per
minute. Find its
(a) frequency
(b) period
(c) linear speed of a point on its rim
(d) centripetal acceleration of a point on its rim
21. The hour hand of clock is 3 m long.
(a) Calculate its linear speed at its tip in meters
per second.
(b) Calculate the centripetal acceleration of the
tip of its hand.
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ID: A
Circular Motion Practice Quiz
Answer Section
MULTIPLE CHOICE
1. ANS:
STA:
2. ANS:
STA:
BLM:
3. ANS:
STA:
4. ANS:
STA:
5. ANS:
STA:
6. ANS:
STA:
BLM:
7. ANS:
STA:
BLM:
8. ANS:
KEY:
9. ANS:
10. ANS:
11. ANS:
12. ANS:
13. ANS:
14. ANS:
15. ANS:
B
PTS:
Ph.1.l
KEY:
A
PTS:
Ph.1.f | Ph.1.g
comprehension
D
PTS:
Ph.1.l
KEY:
B
PTS:
Ph.1.l
KEY:
D
PTS:
Ph.1.l
KEY:
C
PTS:
Ph.1.f | Ph.1.g
comprehension
C
PTS:
Ph.1.f | Ph.1.g
comprehension
D
PTS:
rotation | revolution
C
PTS:
C
PTS:
B
PTS:
B
PTS:
B
PTS:
D
PTS:
C
PTS:
1
linear | sped
1
DIF:
BLM:
DIF:
KEY:
1
DIF:
force | inward
1
DIF:
tangent | path
1
DIF:
force | circular
1
DIF:
KEY:
L2
OBJ: 10.2 Rotational Speed
comprehension
L2
OBJ: 10.3 Centripetal Force
force | direction
L2
L2
L2
L2
weight | Earth
OBJ:
BLM:
OBJ:
BLM:
OBJ:
BLM:
OBJ:
10.4 Centripetal and Centrifugal Forces
comprehension
10.4 Centripetal and Centrifugal Forces
comprehension
10.4 Centripetal and Centrifugal Forces
comprehension
10.3 Centripetal Force
1
DIF: L2
OBJ: 10.3 Centripetal Force
KEY: centripetal | circular | normal
1
| axis
1
1
1
1
1
1
1
DIF: L2
BLM: application
PROBLEM
16. ANS:
4.17 m/s
PTS: 1
17. ANS:
160 m/s2
PTS: 1
1
OBJ: 10.1 Rotation and Revolution
ID: A
18. ANS:
(a) 0.58 Hz
(b) 1.7 s
(c) 0.46 m/s
(d) 1.7 m/s2
PTS: 1
19. ANS:
0.039 m/s2
PTS: 1
20. ANS:
0.098 m
PTS: 1
21. ANS:
(a) 4.4 x 10^-4 m/s
(b) 6.3 x 10^-8 m/s2
PTS: 1
2