Chapters 10-12 Flashcards

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1
Q

What the difference between rotation and revolution?

A

Rotation uses an internal axis and revolution is where an object goes around an external axis.

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2
Q

If two objects are on a merry-go-round where one is close to the middle and the other is out near the edge, which has the greater tangential speed?

A

The further out from the center of a rotating object, the greater the tangential speed.

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3
Q

If two objects are on a merry-go-round where one is close to the middle and the other is out near the edge, which has the greater rotational speed?

A

Every point on a rigid, rotating object has the same rotational speed.

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4
Q

The direction of centripetal force is always __________ .

A

Towards the center.

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5
Q

What provides the centripetal force for a car going around a curve?

A

The friction force between the tires and the road.

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6
Q

Why is centrifugal force not considered a true force?

A

It’s an effect of rotation. It is not part of an interaction and therefore it cannot be a true force.

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7
Q

The make an object turn or rotate, you must apply a ________ .

A

Torque.

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8
Q

If a 100-lb child sat 3 feet from the fulcrum of a seesaw, how far from the fulcrum would a 75-lb child sit on the other side?

A

100 x 3 = 75 x D so D = 4 feet

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9
Q

What is the center of mass?

A

The point located at the object’s average position of mass.

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10
Q

When will an object tip over?

A

When it’s center of mass is no longer above the area of support.

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11
Q

Is the center of mass of a person located in a fixed place?

A

No, it depends on body orientation.

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12
Q

The greater an object’s rotational inertia, the _________ it is to change the rotational speed of the object.

A

more difficult

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13
Q

What is rotational inertia?

A

resistance of an object to changes in its rotational motion (rotational “laziness)

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14
Q

Rotational inertia differs from regular inertia because it depends on ____________

A

distribution of mass.

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15
Q

A ring and a solid disk of similar mass are rolling down a ramp. Which one reaches the bottom first?

A

The solid disk because of lower rotational inertia.

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16
Q

What is angular momentum?

A

The product of rotational inertia and rotational velocity.

17
Q

All points on a rigid, spinning disk have _________ rotational velocity

A

the same

18
Q

Points further from the center of a spinning disk have _______ tangential velocity.

A

greater

19
Q

What principle says that if a spinning skater brings her arms in tighter, she spins faster?

A

Law of conservation of angular momentum.

20
Q

Objects of the same shape but different sizes accelerate _______ when rolled down an incline.

A

equally