Circular Motion and Gravity Physics Test

Horses with the greatest linear speed on a merry-go-round are located

• near the center.

• near the outside.

• anywhere, because they all move at the same speed.

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

• one near inner rail

• one near outer rail

• both move at the same speed in m/s

If a turntable's rotational speed is doubled, then the linear speed of a pet hamster sitting on the edge of the record will

• double

• halve

• remain the same

Your pet hamster sits on a record player that has constant angular speed. If the hamster moves to a point twice as far from the center, then its linear speed

• doubles

• halves

• remains the same

When railroad tracks make a curve, the outer track is longer. This means a wheel that rides on the outer track needs to somehow

• roll slower than the wheel on the inner track.

• maintain the same speed as the wheel on the inner track.

• roll faster than the wheel on the inner track.

When a train makes a curve, a tapered wheel rim is able to:

• cover different distances per revolution.

• maintain a fixed rotational speed.

• reduce differences in angular speeds.

Each rolling wheel of a railroad train is tapered. Compared with the wide part, the narrow part of the wheel has a tangential speed that is:

• less

• greater

• the same for both

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

The rotational inertia of your leg is greater when your leg is:

• A) straight.

• B) bent.

• C) same either way

You can swing your legs to and fro more frequently when your legs are:

• straight

• bent

• same either way