Ch 7: Rotational Motion Flashcards

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1
Q

If an object is rotating clockwise, does this correspond to a positive or negative angular velocity?

A

Negative

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2
Q

Likewise, rotation in the counter clockwise direction is the ________ direction.

A

positive

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3
Q

The angular displacement of a rotating object is measured in _______.

A

radians

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4
Q

Moment of inertia is

A. The rotational equivalent of mass.
B. The time at which inertia occurs.
C. The point at which all forces appear to act.
D. An alternative term for moment arm.

A

A. The rotational equivalent of mass.

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5
Q

Which factor does the torque on an object not depend on?
A. The magnitude of the applied force
B. The object’s angular velocity
C. The angle at which the force is applied
D. The distance from the axis to the point at which the force is applied

A

B. The object’s angular velocity

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6
Q

A net torque applied to an object causes

A. A linear acceleration of the object.
B. The object to rotate at a constant rate.
C. The angular velocity of the object to change.
D. The moment of inertia of the object to change.

A

C. The angular velocity of the object to change.

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7
Q

Torque is the _________ _________ of force.

A

rotational equivalent

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8
Q

The formula for calculating torque is:

The component of the force that is _________ to the radial line causes a torque. The parallel component does NOT contribute to torque.

A

τ = rF sinθ

perpendicular

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9
Q

The angular velocity is given by what equation?

A
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10
Q

Graphically, the angular velocity is the ….

A

….slope of the angular positive-vs-time graph, just as the ordinary velocity is the slope of the position-vs-time graph.

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11
Q

What is the formula which relates net torque to the moment of intertia?

A

τnet = α I

α is the angular acceleration

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