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- 1. Multiple ChoiceWhen an object is in circular motion it is constantly changing its velocity.TrueFalse
- 2. Multiple ChoiceAs the moon orbits the earth, what keeps the moon moving in a circular motion?GravityInertiaCentripetal ForceFriction
- 3. Multiple Choice
You swing a bucket of water attached to a string in a circle above your head. What keeps the water in the bucket?FrictionCentripetal ForceGravityInertia - 4. Multiple ChoiceWhere is the net force when the rollercoaster is at the top of the loop?Towards the skyTowards the RightTowards the leftTowards the ground
- 5. Multiple ChoiceThis picture was taken form the International Space Station. Gravity keeps the space station in orbit.TrueFalse
- 6. Multiple ChoiceIf centripetal force stopped acting on all satellites they would continue traveling in space in a constant direction and constant speed.TrueFalse
- 7. Multiple ChoiceThe centripetal force of satellites is similar to gravitational force because they are both a net force towards the center of earth.TrueFalse
- 8. Multiple Choice
A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the cars velocity?
A
B
C
D
- 9. Multiple Choice
A car is rounding a curve as shown in the diagram. Which arrow correctly shows the direction of the centripetal force keeping the car in circular motion?
A
B
C
D
- 10. Multiple Choice
In the diagram of the car, if the driver took his hands off the steering wheel, which arrow correctly shows the direction the car would travel in?
A
B
C
D
- 11. Multiple Choice
Why do sharp turns in roads have reduced speed limits posted?
The lower the speed the lower centripetal force.
The lower the speed the higher centripetal force.
The lower the speed the larger the radius.
Speed limits aren't reduced on sharp turns.
- 12. Multiple Choice
If car A and car B are both traveling at the same speed, which will require a higher centripetal force?
Car A
Car B
They have the same centripetal force
- 13. Multiple Choice
If a sprinter runs in a circle of radius 50 m in 31 seconds at a constant speed, how fast were they running?
1.61 m/s
3.22 m/s
5.07 m/s
10.1 m/s
- 14. Multiple Choice
A bola is an old hunting instrument. If three rocks with a combined mass of 0.75 kg are spun at a speed of 20 m/s with a radius of 0.5 m, how much centripetal force is required to keep them spinning.
600 N
45 N
30 N
400 N
- 15. Multiple Choice
A car's tires can provide a frictional force up to 8500 N. If a 1000 kg car is traveling at 30 m/s around a bend with a radius of 25 m, will it safely make it around the curve.
No, the required centripetal force is too high.
Yes, the required centripetal force is higher than the frictional force.
- 16. Multiple Choice
An engineer is planning a road with a turn. If the speed limit is 20 m/s and the centripetal acceleration cannot exceed 8.5 m/s/s, how big must the radius of the turn be?
2.4 m
47 m
170 m
3400 m
- 17. Multiple Choice
What is the equation to calculate the centripetal force for an object?
F = mT
F = mv2/r
F = mu mg
F = mg
- 18. Multiple Choice
A ball on a string is spun around in a circle. Which of the following quantities is not constant?
mass
force
velocity
acceleration
- 19. Multiple Choice
A yo-yo is whirled on a string, then the string breaks. What causes the yo-yo to move off in a straight line?
centrifugal force
centripetal force
inertia
centripetal acceleration
- 20. Multiple Choice
A 12 kg object undergoes circular motion with a radius of 4 m and a speed of 18 m/s. What is the centripetal acceleration of the object?
1.125 m/s2
81 m/s2
4.5 m/s2
36 m/s2
- 21. Multiple Choice
The diagram shows an object traveling at a constant speed in a circular path. Which labeled arrow represents the centripetal force acting on the object?
W
Z
X
Y
- 22. Multiple ChoiceA ball on a string is travelling in circular motion. Which vector represents the centripetal force?The green vector because it points towards the center of the circular pathThe blue vector because it shows the direction of the object's inertiaThe green vector because it shows the path of the ballThe blue vector because this is the way the ball will move when it is released.
- 23. Multiple ChoiceCalculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.10 N20 N30 N40 N
- 24. Multiple ChoiceA horse gallops around a circular arena. The centripetal force on the horse is ___.directed outwardtensiondirected toward the center of the arena9.8 N
- 25. Multiple ChoiceWhich represents the acceleration of the ball?ABCD
- 26. Multiple Choice
A 10kg car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (Fc) acting on the car at a particular moment?
- 27. Multiple ChoiceWhat is the difference between centripetal and centrifugal forces?Centripetal is towards center while centrifugal is away from the center.Centrifugal is towards center while centripetal is away from the center.Neither of the above is correct
- 28. Multiple ChoiceThe velocity is always _____ to the line of a circle.outwardstowards the centertangentfaster
- 29. Multiple ChoiceWhich of the following units is used for tangential velocity?m/s2NJm/s
- 30. Multiple ChoiceCalculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5 m/s2.2.4 m/s3.6 m/s3.9 m/s4.2 m/s
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