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Filename: Ch 10 Circular Motion – Review Test.doc
Physics
Parnassus
7/13/2017
Ch 10 Review Test – Circular Motion
Name: ___________________
Circle the correct answer
1. T F The outside rim of a rotating turn-table has a greater linear speed than parts closer to the
axis.
2. T F Any force that causes an object to move in a circular path is called a centripetal force.
3. T F A rotation takes place about an internal axis and a revolution takes place about an external
axis.
4. T F A bug on a turntable will make more turns per minute if it is located nearer to the center of
the record.
5. T F When you whirl a can on the end of a string, the centripetal force on the can is actually the
pull of the string on the can.
Multiple Choice Questions
6. 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 outside horse
B. The inside horse
C. Neither (a) or (b). They both have the same linear speed.
7.
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the
inside rail?
A. The outside horse
B. The inside horse
C. Neither (a) or (b). They both have the same angular speed.
8.
Which of the following is NOT a unit of rotational speed?
A. Radians per second
D. Meters per second
B. Rotations per second
E. Degrees per second
C. Revolutions per minute
9.
What is the direction of the force that acts on clothes in the spin cycle of a washing machine?
A. Outward
D. Down
B. Inward
E. Tangential to rotation
C. Up
10. A tin can whirled on the end of a string moves in a circle because
A. once the can starts moving, that is its natural tendency
B. the can continually pulls on the string
C. there is a force on the can pulling it outward.
D. the string continually pulls inward on the can.
11. 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
D. spiral away from your hand
B. fly directly toward you
E. None of the above
C. fly off, tangent to its circular path
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Filename: Ch 10 Circular Motion – Review Test.doc
Physics
Parnassus
7/13/2017
12. A ladybug rests on the bottom of a tin can that is being whirled in a horizontal circle at the end of a
string. What exerts the force that holds this ladybug in a circle?
A. Your hand
D. gravity
B. The string
E. Centrifugal force
C. The can
13. A centrifugal force is often called fictitious because
A. it is not part of an interaction and therefore cannot be a true force
B. it is not part of the rotating system
C. its wasn’t recognized until after Newton’s time
D. It is an actual force at the present time
Math Problems
v
2 r
t
  2 f
v  r 

2
T
a
v2
r
Fc 
m v2
r
Fc  m r  2
14. A vertical pole standing against a wall topples to the ground. The center of the pole has a speed of
10 m/sec as it hits. With what speed does the far end of the pole hit the ground?
v: r
Speed is proportional to the radius
15. A ball of mass m is whirled overhead in a horizontal circle at radial distance r and speed v. Using
only the symbols, calculate how much greater the force need to keep the ball in a circle if m, r, and v
are all doubled.
16. A toy cart moves with a kinetic energy of 10 Joules. If its speed is doubled, what will its kinetic
energy be?
17. You sit at the outer rim of a Ferris wheel that rotates at 2 revolutions per minute (RPM). What
would your rotational speed be if you were instead clinging to a position halfway from the center to
the outer rim?
18. The tangential speed at the outer rim of a Ferris wheel is 10 meters/sec. What is the tangential speed
of a position half way from the center to the outer rim?
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