A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

angular momentum is conserved, her moment of inertia increases and her angular speed decreases.

angular momentum is conserved, her moment of inertia decreases and her angular speed increases.

angular momentum increases, her moment of inertia increases and her angular speed increases.

angular momentum decreases, her moment of inertia increases and her angular speed remains the same.

A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane and do not slip, which one will reach the bottom first?

They all reach the bottom at the same time.

Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

Neither - they both have the same angular speed

What happens to his rotational inertia when a figure skater brings in his arms?

Decrease his rotational inertia

Increase his rotational inertia

A tin can whirled on the end of a string moves in a circle because

there is an inward force acting on the can.

the can continually pulls on the string.

once the can starts moving, that is its natural tendency.

there is a force on the can pulling it outward.

Where is the center of gravity of a softball bat located?

In the more massive end of the bat

Which object listed below has the greatest momentum?

A 0.4 kg object rolling at 2 m/s.

A 0.05 kg object rolling at 0.2 m/s.

A 0.15 kg object rolling at 2 m/s.

A 0.15 kg object rolling at 1 m/s

Because a hollow ball has a higher moment of inertia than a solid ball...

They both accelerate at the same rate.

If a ball moves with slipping down a ramp

it moves faster than if it had rolled down.

it goes slower than if it had rolled down

It doesn't make a difference about friction or not friction.

Rotational Motion

Authored by Michelle Adams

Physics

11th - 12th Grade

NGSS covered

Used 472+ times

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39 questions

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MULTIPLE CHOICE QUESTION

3 mins • 1 pt

For a rotating rigid body, which of the following statements is NOT correct?

All points along a rotating rigid body move with constant speed

Points along a rotating body have velocities that continuously change directions

Points along a rotating body move through the same angle in equal time intervals

All of the answers are correct

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A radian is all of the following EXCEPT

A dimensionless quantity

The ratio of arc length over radius

The same as degrees

The unit for rotational position

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

The minute hand of a clock goes from the ":00" position to the ":15" position in 15 minutes. What is the angular velocity of the clock hand?

6 degrees/minute

π/30 radians/minute

Both of the above

Neither of the above

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Does a bridge anchored resting on two pillars have any torque?

No, it isn't moving

Yes, but it is at equilibrium

Yes, but it will soon break because of the torque

No, Bridges can't have torque

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The rotational equivalent to d (distance), v (velocity) and a (acceleration) are?

m, m/s, m/s²

θ, ω, α

x, x/t, alphaα

μ, Σ, τ

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The center of mass is:

the exact middle

the heaviest part

the point at which you can balance with one finger

the idea that mass is concentrated throughout

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

How do you get the maximum torque?

longer lever arm and less force at an acute angle

shorter lever arm and less force perpendicularly

shorter lever arm and more force perpendicularly

longer lever arm and more force perpendicularly

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Rotational Motion

For a rotating rigid body, which of the following statements is NOT correct?

A radian is all of the following EXCEPT

The minute hand of a clock goes from the ":00" position to the ":15" position in 15 minutes. What is the angular velocity of the clock hand?

Does a bridge anchored resting on two pillars have any torque?

The rotational equivalent to d (distance), v (velocity) and a (acceleration) are?

The center of mass is:

How do you get the maximum torque?

In the diagram above, two masses, one with mass m, the other with mass M = 2m are resting on a uniform plank of length L that pivots at its midpoint. If the mass m is at the far end of the plank, how far away from the pivot should the mass M be to balance the plank in a horizontal position shown?

A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

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