# Circular Motion

15 Questions

Circular motion quiz.

• 1.
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
• A.

Decreases

• B.

Increases

• C.

Decreases in direct proportion to your decrease in RPMs

• D.

Remains the same, but the RPM decrease

• 2.
Since angular momentum is conserved in a rotating object,
• A.

Speed decreases while mass is constant

• B.

Speed decreases as mass decreases

• C.

Speed increases as radial length decreases

• D.

Speed increases as radial length increases

• 3.
Toss a baseball bat into the air and it wobbles about its
• A.

Center of mass

• B.

Heavier end

• C.

Geometrical center

• 4.
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
• A.

Shorter

• B.

Longer

• C.

Stay the same

• 5.
A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the
• A.

Ring

• B.

Coin

• C.

The one with the least mass

• D.

Both will reach at the same time

• 6.
A torque acting on an objct tend to produce
• A.

Equilibrium

• B.

Linear motion

• C.

A center of gravity

• D.

Rotation

• 7.
On a balanced see-saw, a boy three times as heavy as his partner sits
• A.

More than 1/3 the distance from the fulcrum

• B.

Less than 1/3 the distance from the fulcrum

• C.

1/3 the distance from the fulcrum

• 8.
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
• A.

Handle part

• B.

Bristles part

• C.

They have the same weight

• 9.
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?
• A.

1/2 kg

• B.

1/4 kg

• C.

1 kg

• D.

3/4 kg

• E.

More than 1 kg

• 10.
Two people are balanced on a see-saw. If one person leans toward the center of the see-saw, that person's end will
• A.

Fall

• B.

Rise

• C.

Stay the same

• 11.
A tightrope walker more easily balances on a tightrope if his pole
• A.

Is held high

• B.

Droops (bends)

• C.

Is short and light

• D.

Is short and heavy

• 12.
When doing somersaults, you'll more easily rotate when your body is
• A.

Straight

• B.

Balled up

• C.

No difference

• 13.
The famous leaning tower of pisa doesn't topple over because its center of gravity is
• A.

Displaced from its center

• B.

In the same place as its center of mass

• C.

Above a place of support

• D.

Relatively low for such a tall building

• 14.
As centrifugal force increases
• A.

Centripetal force decreases

• B.

Centripetal force increases

• C.

Centripetal force must be constant

• D.

Center of mass increases

• 15.
To turn a stubborn screw, it is best to use a screwdriver that has a
• A.

Wide handle

• B.

Long handle

• C.

Yellow color

• D.

None of these

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