Rotational Kinematics & UCM Test Review

Are astronauts really weightless?

• No; the moon pulls on them with its gravity making them appear weightless

• Yes; there is no gravity acting on them in space

• No; they are in a constant state of free fall rotating around the Earth

• Yes; they have no weight in space

Tags

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What is "centrifugal" force actually?

• Inertia

• Weight

• Mass

• Rotational Motion

What does the term "centripetal" mean?

• Center Fleeing

• Circular

• Rotational

• Center Seeking

Is centripetal force a new force from the forces we know already from Newton's Laws?

• Yes; it is its own force separate from other forces

• No; centripetal force is actually inertia

• No; centripetal force is actually forces like friction or tension

• Yes; it has its own formula

If your car door wasn't on your car, you were not wearing your seatbelt, and you turned right very quickly around a tight curve, what would happen to you (the driver)?

• You would lean into the car and remain inside the vehicle

• You would want to continue straight along your tangent, falling out of the car

• You would stay inside the car because of friction of your body on the seat

Tags

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What does the term "tangential" mean?

• Moving in a straight line

• Moving in a cirlce

• Moving forward

• Moving around

In uniform circular motion, there is a

• Constant velocity

• Constant angular velocity

• Zero acceleration

• Net tangential acceleration

If the centripetal force on a particle in uniform circular motion is decreased

• The tangential speed remains constant

• The tangential speed will decrease and/or the radius will increase

• The tangential speed will increase

• The radius of the circular path will decrease

Is there an example when a car experiences both centripetal and angular acceleration?

• Yes; when a car is changing its speed around a curve

• No; both accelerations cannot act at the same time

• Yes; when the car is moving in a straight line

• No; the car only experiences centripetal acceleration around a curve

When an object rotates in circular motion, it has

• Only angular velocity

• Neither tangential or angular velocity

• Both tangential and angular velocity

• Only tangential velocity