Download Circular Motion Review

Circular Motion Review
1.
In our physics class, circular motion always assumes a constant speed. However, velocity is not constant. Why
is velocity not constant?
a. Speed is not a component of velocity
c. Velocity is a vector.
b. Speed is constant but direction is changing
d. Both b and c are correct.
2.
You want to make a bowling ball travel in a circular counter-clockwise path around you (this means YOU are
the center point). After you set the ball in motion “to the left”, in what direction will force need to be exerted
to keep the ball in a circular path?
a. You need to constantly push the ball away from you.
b. You need to constantly push the ball toward you.
c. You need to constantly push the ball to the left.
3.
When referring to circular motion, a period is
a. The distance traveled in one revolution
b. The time required to travel one revolution
c. The number of revolutions traveled in one second
4.
Two children are riding a carousel. Which child is moving faster?
a. The one on the outer horse. b. The one on the inner horse.
c. Both move at the same speed.
5.
If you are traveling in a circle at constant speed, are you accelerating?
a. No, because you are not changing your speed
b. Yes, because you are changing direction
6.
Acceleration which points to the center of a circular path is called
a. Centrifugal acceleration
b. Inertia
c. Centripetal acceleration
7.
The Cajun Cliffhanger at Great America is a ride in which occupants line the perimeter of a cylinder and spin in
a circle at a high rate of turning. When the cylinder begins spinning very rapidly, the floor is removed from
under the riders' feet. What force keeps the riders moving in a circular path (i.e. which force is the centripetal
force)?
a. Tension
b. Friction
c. Normal force
d. Gravity
8.
What affect does a doubling in speed have upon the centripetal force?
a. The centripetal force is halved.
c. The centripetal force is quadrupled.
b. The centripetal force is doubled.
d. The centripetal force does not change.
9.
A 900 kg car moving at 10 m/s takes a turn around a circle with a radius of 25.0 m. Determine the acceleration
and the net force acting upon the car.
10. Determine the centripetal force acting upon a 40 kg child who makes 10 revolutions around the Cliffhanger
(see #7) in 29.3 seconds. The radius of the barrel is 2.90 meters.