Lookmamalook

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Torque and rotations

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1: Rotational speed is the number of rotations or revolutions per unit of time.: True
False
2: Torque is different from force.: True
False
3: Centripetal means:: center-seeking
center-fleeing
speed
force
4: Objects of different shapes and mass distributions will accelerate equally when rolled down an incline.: True
False
5: What is a rotation?: axis
angularity
spin
speed
6: Rotational inertia is the resistance of an object to changes in its state of rotation.: True
False
7: Linear speed and rotational speed are not related.: True
False
8: Centrifugal means:: center-seeking
center-fleeing
speed
force
9: Turning of an object about an external axis:: Rotation
Revolution
10: Occupants of the space shuttle are weightless because they lack a support force.: True
False
11: Tendency of a force to cause a rotation about an axis:: Spin
Rotation
Revolution
Torque
12: On one end of a see-saw sits a 200-newton child, two meters from the fulcrum. Along comes a 400-newton child. How far from the fulcrum on the other side must this second child sit to balance with the first child?: 0.5 meter
1.0 meter
2.0 meter
4.0 meter
13: Which will swing faster?: 1.0 meter pendulum
0.5 meter pendulum
14: An example of a flywheel:: Bicycle wheel
Gyroscope
Both of the above
None of the above
15: Gravity is experienced as a form of acceleration.: True
False
16: A space station must be 2 km in diameter to generate artificial gravity by spinn ing at no more than 1 rpm because:: Smaller sizes can't accomodate all the scientists
Some people cannot adjust to greater rotational speeds
Greater speeds take too much energy
17: Which is a "ficticious" (not real) force?: Centripetal force
Centrifugal force
18: Which is a rotational speed?: 100 km
90 m/s
1000 rpm
90 s
19: Increasing which value will increase angular momentum?: Mass
Velocity
Radius
All the above
20: A skater begins a spin with limbs extended, then suddenly draws her limbs up tightly and compactly to her body. Her rate of rotational spin:: Increases
Decreases
Stays the same