Rotational Motion 2: Question Preview (ID: 11866)


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Which of the following is TRUE?
a) The angular momentum of a rotating system is conserved if no external torque acts on it. b) A cat dropped upside down will twist and land on its feet while maintaining a state of zero angular c) Angular momentum of a rotating system does not change unless there is an unbalanced external torque d) All of these statements are true
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) .25 kg*m2 d) .5 kg*m2
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) B, A, C b) C, A, B c) A, C, B d) A, B, C
Which will have the greater acceleration rolling down an incline-- a hoop or a solid disk?
a) hoop b) solid disk c) they are equal d) you will get the question wrong if you choose this answer
Which will swing to and fro more often, a short pendulum or a long pendulum?
a) short b) long c) swing at the same rate d) pendulums don't swing
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) triple c) quadruple d) none
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) triple c) quadruple d) none
Which has greater linear speed, a horse near the outside rail of a race track or one near the inside rail?
a) the outside horse b) the inside horse c) neither, they both have the same linear speed d) horses don't run.
Which description would produce the greatest torque?
a) small force, short lever arm b) large force, short lever arm c) small force, long lever arm d) large force, long lever arm
The rotational inertia of an object is greater when most of the mass is located
a) near the center b) off center c) on the rotational axis d) away from the rotational axis
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