Rotational Motion Chapter 8

The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into the air. The disk becomes wider during its flight, while its rotational speed

• slows

• remains constant

• quickens

A vertically held sledge hammer is easier to balance when the heavier end is

• same either way

• on your hand

• at the top away from your hand

When you do somersaults, you'll more easily rotate when your body is

• no difference

• straight with both arms above your head

• straight with both arms at your sides.

• curled into a ball shape.

Centrifugal forces are an apparent reality to observers in a reference frame that is

• moving at constant velocity.

• at rest.

• an inertial reference frame.

• rotating

The rotational inertia of a pencil is greatest about an axis

• about its end, like a pendulum.

• along its length, where the lead is.

• about its midpoint, like a propeller.

A solitary boy cannot balance on a seesaw with its fulcrum at its midpoint. If the fulcrum is moved to one quarter the distance from the boy, balance is achieved when the weight of the boy is

• equal to the weight of the seesaw.

• more than the weight of the seesaw.

• less than the weight of the seesaw.

• need more information

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Which horse moves faster in m/s on a merry go round?

• one near outer rail

• one near inner rail

• both move at the same speed in m/s.

If the rotational speed of a rotating habitat in space increases, the weight experienced by occupants

• decreases

• increases

• stays the same

• is always zero

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If you balance a broom horizontally on one finger, the center of gravity of the broom will be above your finger, closer to the bristles end than the handle end. If you saw the broom in two pieces at that point and weigh the two parts on a scale, you'll find that the heavier part is the

• bristles part

• handle part

• both the same

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The tapered shape of the wheel rims that ride on railroad tracks allows opposite wheels to

• in effect, vary their diameters.

• travel at different linear speeds for the same rotational speed

• both of these

• none of these