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Distinguish between linear momentum and angular momentum.

Angular momentum depends on the distribution of mass, whereas linear momentum depends on the total mass.

What is required to change the angular momentum of a system?

External torque

The experimenter from the video rotates on his stool, this time holding his empty hands in his lap. You stand on a desk above him and drop a long, heavy bean bag straight down so that it lands across his lap, in his hands. What happens?

He spins slower.

Is it easier to balance a long rod with a mass attached to it when the mass is closer to your hand or when the mass is farther away?

It is easier when the mass is farther from your hand.

How is a flywheel constructed to maximize its rotational inertia?

Most of the mass is concentrated far from the axis.

Why does the rotational inertia of the rod with the attached mass closer to your hand compare the way it does with the rotational inertial of the rod with the attached mass farther away?

Rotational inertia depends on whether the mass is farther or closer to the point of rotation. The farther the mass is, the higher the rotational inertia.

On a rotating turntable, how do tangential speed and rotational speed vary with distance from the center?

Tangential speed increases with distance. Rotational speed is constant.

Inertia depends on mass; rotational inertia depends on mass and something else. What?

The distribution of mass about the axis of rotation

How does the rotational inertia of the rod with the mass toward the bottom compare with the rotational inertia of the mass toward the top?

The rotational inertia of the rod with the mass closer to the top is greater than the rotational inertia of the rod with the mass closer to the bottom.

Which will have the greater acceleration rolling down an incline: a hoop or a solid disk? Why?

The solid disk will because the mass is closer to the axis of rotation.

The tangential speed on the outer edge of a rotating carousel is _______.

greater than toward the center

When a rock tied to a string is whirled in a horizontal circle, doubling the speed _______.

quadruples the tension in the string