Circular Motion

1. Toss a baseball bat into the air and it wobbles about its

Center of mass

Heavier end

Geometrical center

2. When doing somersaults, you'll more easily rotate when your body is

Straight

Balled up

No difference

3. Two people are balanced on a see-saw. If one person leans toward the center of the see-saw, that person's end will

Fall

Rise

Stay the same

4. A torque acting on an objct tend to produce

Equilibrium

Linear motion

A center of gravity

Rotation

5. On a balanced see-saw, a boy three times as heavy as his partner sits

More than 1/3 the distance from the fulcrum

Less than 1/3 the distance from the fulcrum

1/3 the distance from the fulcrum

6. 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 lighter part is the

Handle part

Bristles part

They have the same weight

7. A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the

Ring

Coin

The one with the least mass

Both will reach at the same time

8. Since angular momentum is conserved in a rotating object,

Speed decreases while mass is constant

Speed decreases as mass decreases

Speed increases as radial length decreases

Speed increases as radial length increases

9. If the polar icecaps melted, the resulting water would spread over the entire earth. The new mass distribution would tend to make the length of the day

Shorter

Longer

Stay the same

10. As centrifugal force increases

Centripetal force decreases

Centripetal force increases

Centripetal force must be constant

Center of mass increases

11. A 1kg rock is suspended from the tip of a meter stick at the 0cm mark so that the meter stick balances like a see-saw when the fulcrum is at the 25cm mark. From this information what is the mass of the meter stick?

1/2 kg

1/4 kg

1 kg

3/4 kg

More than 1 kg

12. A tightrope walker more easily balances on a tightrope if his pole

Is held high

Droops (bends)

Is short and light

Is short and heavy

13. Suppose you are at the center of a large freely rotating horizontal turntable in a carnival fun house. As you crawl toward the edge, the angular momentum of you and the turntable

Decreases

Increases

Decreases in direct proportion to your decrease in RPMs

Remains the same, but the RPM decrease

14. To turn a stubborn screw, it is best to use a screwdriver that has a

Wide handle

Long handle

Yellow color

None of these

15. The famous leaning tower of pisa doesn't topple over because its center of gravity is

Displaced from its center

In the same place as its center of mass

Above a place of support

Relatively low for such a tall building