Physics 223 - Quiz #5
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Name:
**Circle the correct answer from the choices provided with each question. In addition, you must justify
your selection of an answer. You may show your mathematical work, provide a clear definition, or
eliminate the incorrect answers. Only partial credit will be given if a clear justification is not provided.
1. Every point-mass on a rigid rotating object has
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a) the same angular speed and angular acceleration
b) a different angular speed but the same angular acceleration
c) the same linear and angular speed
d) the same angular speed and linear acceleration
e) none of these
2. A mass is traveling in a circular path at constant tangential speed. It follows that
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a) the acceleration of the mass is zero.
b) the acceleration is finite and directed to the center of the circular path.
c) the acceleration is finite and directed outward from the center of the circular path.
d) the velocity of the mass is constant.
e) None of these is correct.
3. Two objects are traveling in circular orbits. Object A is traveling at twice the linear
velocity of object B in a circle with a diameter of twice that of B. The centripetal acceleration
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a) of A and B are the same.
b) of A is twice that B.
c) of A is four times that of B.
d) of A is half that of B.
e) None of the above.
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4. Which of the following does not belong with the others?
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a) A car speeds up from 30 mph to 40 mph. 4b) A car brakes from 20 mph to 0.
c) A race car rounds a curve at 120 mph. &c
d ) A car coasts down a road at constant speed.
e) None of the above ...they are all related!
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5. A Cadillac with mass 3 m, and a Volkswagen with mass m, go around the same
unbanked circular curve on the freeway. Bumper to bumper they go with the same speed
v,. The centripetal acceleration of the VW is a, and the centripetal force acting on it is F,.
The centripetal acceleration of the Cadillac is -a,.
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a) more than
b) incomparable with
c) less than
d) equal to
6. A quarter and a penny rest on a turntable such that the quarter is twice as far from the
center as the penny. Which coin has the greater angular speed?
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a) Quarter
b) Penny
c) Neither, they have the same angular speed
d) Not enough information given