Download A,C,B,B,C,D,C,D,D,D _____1. A racing car is moving around the

AP Physics Circular Motion Practice Quiz
Answers: A,C,B,B,C,D,C,D,D,D
_____1. A racing car is moving around the circular track of radius 300 meters shown below. At the instant
when the car's velocity is directed due east, its acceleration is directed due south and has a magnitude of 3
meters per second squared. When viewed from above, the car is moving
A. clockwise at 30 m/s
B. clockwise at 10 m/ s
C. counterclockwise at 30 m/s
D. counterclockwise at 10 m/s
E. with constant velocity
_____2. A ball of mass m is attached to the end of a string of length Q as shown below. The ball is released
from rest from position P. where the string is horizontal. It swings through position Q. where the string is
vertical, and then to position R. where the string is again horizontal. What are the directions of the acceleration
vectors of the ball at positions Q and R?
Position Q
Position R
A. Downward
Downward
B. Downward
To the right
C. Upward
Downward
D. Upward
To the left
E. To the right
To the left
______3. An Earth satellite moves in a circular orbit 5000 km above the Earth's surface. The period of the
motion is 212 minutes. What is the acceleration of the satellite? The Earth's radius is 6,378,140 m.
A. 0.0 m/s2.
B. 3.0 m/s2.
C. 7.6 m/s2.
D. 8.0 m/s2.
E. 9.8 m/s2.
_____4. A figure of a dancer on a music box moves counterclockwise at constant speed around the path shown
above. The path is such that the lengths of its segments, PQ, QR, RS, and SP, are equal. Arcs QR and SP are
semicircles. Which of the following best represents the magnitude of the dancer's acceleration as a function of
time t during one trip around the path, beginning at point P ?
_____5.A 1500 kg car travels at 15 m/s around an unbanked (flat) highway curve of radius 60 m. The
coefficient of static friction is 0.7. The force of friction on the car is
A. 0.38 N.
B. 0.48 N.
C. 5625 N.
D. 10290 N.
E. 14700 N.
1
_____6. A bicycle tire of radius 0.62 m rotates 1400 times in 900 s. The average tangential speed of a point on
the tire is
A. 9.8 m/s.
B. 11.3 m/s.
C. 4.2 m/s.
D. 6.1 m/s.
E. 8.3 m/s.
_____7. A clay ball is traveling in a horizontal circle at the end of a string as shown below. If string is cut when
the ball is at point X, which arrow shows the direction the clay ball will go?
_____8. A Ferris Wheel with a radius of 18 m rotates 2 times per minute. What is the force of the seat on a 80
kg person at the top of the ride?
A. 0 N.
B. 64 N.
C. 482 N.
D. 721 N.
E. 784 N.
_____9. A 5.0 kg pendulum swings at the end of a 4.0 m long cable. The pendulum is released from a height of
2.3 m above the lowest position of its swing. What is the maximum tension in the cable?
A. 49.0 N.
B. 32.1 N.
C. 56.3 N.
D. 105.3 N.
E. 86.0 N.
_____10. A 1.2 kg tether ball is hit so that it circles the pole with an angular speed of 3 radians/s. The length of
the tether is 2 m. The angle measured from the tether to the vertical pole is
A. 51.9o.
o
B. 80.7 .
o
C. 61.4 .
o
D. 57.0 .
E. 28.3 o
2