Rotational Equilibrium & Dynamics

If no external torque acts on a body, its angular velocity remains conserved.

• True

• False

The easiest way to open a heavy door is by applying the force

• Near the hinges

• In the middle of the door

• At the edge of the door far from the hinges

• At the top of the door

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NGSS.HS-PS2-1

What does the symbol Δω mean?

• angular acceleration

• angular velocity

• change in angular acceleration

• change in angular velocity

The angle of rotation is

• ratio of the radius to arc length

• product of arc length, pi, and radius

• ratio of the arc length to radius

• product of diameter and arc length

"A body in motion at constant angular velocity will continue in motion at the same angular velocity, unless acted upon by some unbalanced external torque."

• 1st Law of Rotational Motion

• 2nd Law of Rotational Motion

• 3rd Law of Rotational Motion

• Zeroth Law of Rotational Motion

Why are you more stable when riding a bicycle at a faster speed?

• You have more mass

• The wheels have angular momentum

• It's not easier to ride at a faster speed

• The bike has more momentum

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NGSS.HS-PS2-2

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

• her moment of inertia increases and her angular speed decreases.

• her moment of inertia decreases and her angular speed increases.

• her moment of inertia increases and her angular speed increases

• her moment of inertia increases and her angular speed remains the same.

A solid sphere rolling without slipping down an incline has:

• rotational kinetic energy.

• constant angular momentum.

• zero external torques

• translational kinetic energy

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NGSS.HS-PS3-2

Static equilibrium occurs when an object is

• rotating.

• translating.

• at rest.

• rotating and translating.

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

• Yes, but it will soon break because of the torque

• No, it isn't moving

• No, Bridges can't have torque

• Yes, but it is at equilibrium