Transcript The Circular Motion Game

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1. Two people sit on a balanced seesaw. When
one person leans toward the center of the
seesaw, that person's end of the seesaw will
A.
B.
C.
stay at the same level
rise
fall
2. You tie a can to a string and whirl it above
your head. If you keep the length of the
string the same and whirl the can faster and
faster, the force you exert on the string
A.
B.
C.
stays the same.
increases.
decreases.
3. If an object is in stable equilibrium, any
displacement will
A.
B.
C.
D.
E.
decrease its mass.
increase its mass.
neither raise nor lower its center of gravity.
lower its center of gravity.
raise its center of gravity.
4. Which of the following is NOT a unit of
rotational speed?
A.
B.
C.
D.
E.
Rotations per second
Revolutions per second
Rotations per minute
Meters per second
Revolutions per minute
5. Torque is defined as _____.
A.
B.
C.
D.
E.
force times time
mass times acceleration
mass times velocity
force times lever arm
momentum times radius
6. Which has greater linear speed, a horse near
the outside rail of a merry-go-round or a
horse near the inside rail?
A.
B.
C.
The outside horse
The inside horse
Neither—they both have the same linear
speed.
7. A meter stick is balanced at the 50-cm
mark. You tie a 20-N weight at the 60-cm
mark. Where should a 10-N weight be placed
so the meter stick will again be balanced?
A.
B.
C.
D.
E.
20 cm mark
30-cm mark
60-cm mark
70-cm mark
90-cm mark
8. An object thrown into the air with a spin
rotates about its
A.
B.
C.
D.
E.
midpoint.
geometric center.
center of gravity.
edge.
none of the above
9. If an object is in unstable equilibrium, any
displacement will
A.
B.
C.
D.
E.
lower its center of gravity.
decrease its mass.
raise its center of gravity.
neither raise nor lower its center of gravity.
increase its mass.
10. If an object is in neutral equilibrium, any
displacement will
A.
B.
C.
D.
E.
increase its mass.
raise its center of gravity.
neither raise nor lower its center of gravity.
lower its center of gravity.
decrease its mass.
11. A car travels in a circle with constant
speed. The net force on the car
A.
B.
C.
D.
is directed toward the center of the curve.
is zero because the car is not accelerating.
is directed forward, in the direction of
travel.
none of the above
12. Suppose you try loosening a nut with a
wrench, and the nut doesn't give at all. You
increase your chance of success if you _____.
A.
B.
C.
D.
E.
extend the lever arm
have a friend help you pull on the wrench
exert a larger force
be sure to exert force perpendicular to the
lever arm
all of the above
13. Which has greater rotational speed, a horse
near the outside rail of a merry-go-round or
a horse near the inside rail?
A.
B.
C.
The outside horse
The inside horse
Neither—they both have the same rotational
speed.