Rotational Motion Review

What is the action that produces a change in an object’s rotation?

• Angular Velocity

• Momentum

• Torque

• My Mind because I am a Wizard, Harry

If no net torque acts on an object, then the object will rotate at a constant rate.

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Newton's Fourth Law

True or False: If the wheel is not slipping, the friction force points uphill whether the wheel rolls up the plane or down the plane.

• True

• False

Tags

NGSS.HS-PS2-1

If the wheels have the same mass, which wheel would experience a lower acceleration and why?

• Red would because it has more inertia

• Red would because it has less inertia

• Green would because it has more inertia

• Green would because it has less inertia

Tags

NGSS.HS-PS2-1

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?

• cylinder
• pipe
• sphere
• They all reach the bottom at the same time.

Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?

• The small sphere arrives first.
• The large sphere arrives first.
• Both 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?

• The inside horse
• The outside horse
• Neither - they both have the same angular speed

True or False: The farther the mass is spread, the higher the rotational inertia.

• True

• False

True or False: The farther the mass is spread, the higher the angular velocity.

• True

• False

Which cylinder is easier to spin and why? The cylinder on the left where the axis is parallel to the cylinder’s axis OR the cylinder on the right where the axis is perpendicular to the cylinder’s axis?

• Left because cylinder’s atoms are all further from the axis of rotation, which means more rotational inertia.

• Left because cylinder’s atoms are all closer to the axis of rotation, which means less rotational inertia.

• Right because cylinder’s atoms are all further from the axis of rotation, which means more rotational inertia.

• Right because cylinder’s atoms are all closer to the axis of rotation, which means less rotational inertia..