Rotational Equilibrium Flashcards

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1
Q

An object will remain in rotational equilibrium if its center of mass is above the area of support.

A

An object will remain in rotational equilibrium if its center of mass is above the area of support.

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2
Q

is produced by this turning force and tends to produce rotational acceleration.

A

TORQUE (Ex. open a door, turn on a water faucet, or tighten a nut with a wrench)

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3
Q

The same torque can be produced by a large force with a short lever arm, or a small force with a long lever arm.

A

NOTE!!
different force can produce same amounts of torque!!!!!!!!

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4
Q

When do you produce a greater torque? Greater torques are produced when?

A

Greater torques are produced when both the force and lever arm are large.

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5
Q

If you cannot exert enough torque to turn a stubborn bolt, would more torque be produced if you fastened a length of
rope to the wrench handle as shown?

A

No, because the lever arm is the same. To increase the lever arm, a better idea would be to use a pipe that extends upward.

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6
Q

What happens when balanced torques act on an object

A

there is no change in rotation.

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7
Q

Where is the center for an irregularly shaped object, such as a baseball bat, etc

A

the center of mass is toward the heavier end.

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8
Q

What happens to the center of mass of the fireworks and its rocket before and after the explosion?

A

the fireworks rocket and its fragments move along the same path before and after the explosion.

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9
Q

The CG of an object may be located where no actual material exists. (JUST A NOTE)

A

For example: The CG of a ring lies at the geometric center where no matter exists.

The same holds true for a hollow sphere such as a basketball.

CG CAN ALSO BE LOCATED IN THE:

MIDDLE OF A FRISBEE

THE TOP OF AN EMPTY CUP

AND BENEATH THE MIDDLE OF THE CHAIR

THE MIDDLE OF A DONUT

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10
Q

Can an object have more than one CG?

A

No. A rigid object has one CG.

If it is nonrigid, such as a piece of clay or putty, and is distorted into different shapes,
then its CG may change as its shape is changed. Even then, IT HAS 1 CG FOR ANY GIVEN SHAPE

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11
Q

How is the center of gravity of an everyday
object related to its center of mass?

A

center of mass and center of gravity is the same which can be used interchangeably

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12
Q

What happens If the center of gravity of an object is above the area of support,

A

The object will remain upright

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13
Q

What happens if If the CG extends outside the area of support

A

If the CG extends outside the area of support an unbalanced torque exists, and the object will topple. (this is the rule for toppling)

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14
Q

Where does the person’s center of gravity depend on, is it a fixed place?

A

No it is not a fixed place, and its CG depends on the body’s orientation (movement)

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15
Q

When the force is perpendicular, the distance from the turning axis to the point of contact is called

A

Lever arm

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16
Q

What happens to the CG of a cone standing on its point when it topples?

A

The CG is lowered by any movement.

17
Q

We say that an object balanced so that any displacement LOWERS ITS CENTER OF MASS, the object will be in?

A

unstable equilibrium.

18
Q

We say an object that is balanced so that any displacement RAISES ITS CENTER OF MASS, the object will be in?

A

stable equilibrium

19
Q

A cone balances easily on its base but to make it topple, Its CG must be raised or lowered?

A

its CG must be raised (This means the cone’s potential energy must be increased,
which requires work)

20
Q

Well, CG AND center of mass can be used interchangeably. what is the difference between the two

A

The Center of mass is based on the mass of the body. The Center of gravity is based on the weight of the body.

21
Q

A cone on lying on its side is balanced so that any small movement NEITHER raises nor lowers its center of gravity. The cone is in?

A

Neutral equilibrium

22
Q

Is the CG of the table tennis ball higher or lower when anchored to the bottom

A

The CG is higher when anchored to the bottom

23
Q

Is the CG of the table tennis ball higher or lower when it is floating in the water

A

The CG is lower when the ball floats.

24
Q

What happens to the center of gravity when an object is toppled?

A

When an object is toppled, the center of gravity of that object is raised, lowered, or unchanged.