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Name _______________________________
Date ________________________ Period ____________________
Circular Motion Practice Review
1. A small child near the outside edge of a merry-go-round has the
greatest linear speed at the
a. outside edge.
b. inner edge.
c. Neither-They both have the same linear speed.
2. Where would a small child sitting on a lion on a carousel have the
greatest angular speed?
a. A lion near the outside edge.
b. A lion near he inside edge.
c. Neither-They both have the same angular speed.
3. Which of the following is a unit of rotational speed?
a. Revolutions per second
b. Meters per seconds
c. Rotations per second2
4. What is the direction of the centripetal force that acts on a cork that is
spinning in a horizontal circle while attached to a string?
a. Outward
b. Inward
c. Down
5. If the string attached to the cork in the question above should
suddenly break, the cork will
a. fly off at a tangent from its circular path.
b. continue flying in a circle.
c. spiral straight down.
6. A car doubles its linear speed on a circular race track while maintaining
a constant radius, what will happen to the centripetal acceleration?
a. It remains the same.
b. It is doubled.
c. It is quadrupled.
7. To convert angular velocity to linear velocity, you would
a. multiply by the centripetal acceleration.
b. divide by the radius.
c. multiply by the radius.
8. If you double the mass of a car, how will it affect the centripetal
acceleration if all of the remaining variables are constant?
a. It will double.
b. It will remain the same.
c. It will be reduced by half.
9. A car is traveling in a circular path with uniform circular motion on an
unbanked curve and suddenly has the coefficient of friction reduced,
what will happen to the car?
a. Nothing
b. The radius of its circular path will increase.
c. The radius of its circular path will decrease.
10. Which of the following variables is not needed to calculate the
angle of a banked curve?
a. The radius of the curve.
b. The linear speed of an object moving around the curve.
c. The mass of the object moving around the curve.
11. In uniform circular motion, which of the following changes?
a. Velocity
b. Speed
c. Neither-They both stay the same.
12. In uniform circular motion, the centripetal acceleration always
points
a. outward.
b. inward.
c. down.
13. What is the angle between the centripetal acceleration and the
linear velocity vectors?
a. 0 degrees
b. 45 degrees
c. 90 degrees
14. A car traveling in uniform circular motion is
a. moving at a constantly changing speed.
b. accelerating.
c. moving at a constant velocity.
15. What provides the centripetal force to keep a car moving around
an unbanked curve at constant speed?
a. Static friction between the road and tires.
b. Kinetic friction between the road and tires.
c. The speed and radius of the curve.
16. On an unbanked curve, what road condition requires a slower
speed during uniform circular motion at the same radius?
a. Dry road
b. Wet road
c. Neither- The road condition does not affect the speed.
17. If friction disappears on a banked curve, what provides the
centripetal force ?
a. Normal force*cos 
b. Normal force *sin 
c. Normal force
18. Which of the following factors determine the safe bank angle of a
steeply banked curve?
a. Speed
b. Radius
c. All of the above.
19. In uniform horizontal circular motion, when an object is
accelerating on an unbanked curve, the net force acting on it is
the same as the
a. centripetal force.
b. weight.
c. mass.
20. A light car and a heavy car with similar tires are traveling safely
around an unbanked curve at the same radius, the safe speed of
which car will be the greatest?
a. Light car
b. Heavy car
c. Neither- The speeds are the same.
21. Which of the following is the equation for the centripetal
acceleration of unbanked curves?
a. a = v2/r
b. a = v2/rg
c. a = v2/g
22. What is the centripetal force on a vehicle with a mass of 2000. kg
traveling in a uniform circular path at a speed of 22 m/s on an
unbanked curve with a radius of 60. m ?
a.16,000 N
b.1,600 N
c.730 N
23. Convert the angular speed of .22 radians/sec to linear speed on
50. meter radius curve.
a.35 m/s
b.11 m/s
c.3.5 m/s
24. What is the centripetal acceleration of a 43 kg skater traveling
with uniform circular motion on an unbanked curve at 2.2 m/s
with a radius of 4.0 m?
a. .55 m/s2
b.1.2 m/s2
c. 8.8 m/s2
25. On a banked curve with a radius of 540 m and a the safe speed
of 13 m/s, what is the angle that the curve is banked?
a.22 
b.17 
c.12
26. What is the frictional force acting on a 2100 kg car with a
coefficient of friction of .60 on an unbanked curve?
a. 12 000 N
b. 3 500 N
c. 1 300 N