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Rotational Motion 2
Test Description: Chapter 12 Conceptual Physics Rotational Motion Part 2
Instructions: Answer all questions to get your test result.
1) Which of the following is TRUE?
A
Angular momentum of a rotating system does not change unless there is an unbalanced external torque
B
All of these statements are true
C
A cat dropped upside down will twist and land on its feet while maintaining a state of zero angular
D
The angular momentum of a rotating system is conserved if no external torque acts on it.
2) A 1.0 kg solid lead ball is attached to a .5 m string and swung in a circle. The ball’s speed at the end of the string is 2.5 m/s. What is the ball’s rotational inertia? (I=mr2)
A
0.0625 kg*m2
B
0.125 kg*m2
C
.5 kg*m2
D
.25 kg*m2
3) Beginning from a rest position, a solid disk A, a solid ball B, and a hoop C, race down an incline. Rank them in order of finishing: winner, second place, and third place.
A
A, B, C
B
C, A, B
C
B, A, C
D
A, C, B
4) Which will have the greater acceleration rolling down an incline-- a hoop or a solid disk?
A
they are equal
B
hoop
C
solid disk
D
you will get the question wrong if you choose this answer
5) Which will swing to and fro more often, a short pendulum or a long pendulum?
A
short
B
long
C
pendulums don't swing
D
swing at the same rate
6) If a skater who is spinning pulls her arms in so as to reduce her rotational inertia to half, how much will her angular momentum increase?
A
double
B
none
C
triple
D
quadruple
7) If a skater who is spinning pulls her arms in so as to reduce her rotational inertia to half, how much will her rate of spin increase?
A
double
B
quadruple
C
triple
D
none
8) Which has greater linear speed, a horse near the outside rail of a race track or one near the inside rail?
A
the inside horse
B
neither, they both have the same linear speed
C
horses don't run.
D
the outside horse
9) Which description would produce the greatest torque?
A
small force, long lever arm
B
large force, short lever arm
C
large force, long lever arm
D
small force, short lever arm
10) The rotational inertia of an object is greater when most of the mass is located
A
near the center
B
off center
C
away from the rotational axis
D
on the rotational axis
*select an answer for all questions
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