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- 1. Multiple Choice
What force keeps an object moving in a circle?
centripetal force (inward)
centrifugal force (outward)
- 2. Multiple Choice
What happens if you let go of the string when you spin the stopper around your head?
the stopper continues moving in a circle
the stopper moves in a straight line
- 3. Multiple Choice
What is the equation for acceleration?
v = 2πr/T
a = v2/r
F = mv2/r
F = ma
- 4. Multiple Choice
What is the equation for centripetal force?
v = 2πr/T
a = v2/r
F = mv2/r
F = ma
- 5. Multiple Choice
Centripetal acceleration always pointsin the direction of the object's motionin the opposite direction of the object's motiontowards the center of the circletowards the outside of the circle - 6. 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?
- 7. Multiple ChoiceA test car moves at a constant speed around a circular track. If the car is 48.2 m from the track's center and has a centripetal acceleration of 8.05 m/s2, what is the car's tangential speed?19.7 m/s5.99 m/s0.17 m/s388.01 m/s
- 8. Multiple ChoiceWhen an object is in circular motion it is constantly changing its velocity.TrueFalse
- 9. Multiple ChoiceCalculate the amount of centripetal force it takes for a softball pitcher to rotate a ball with a velocity of 3 m/s if the ball weighs .12 kg and her arm is .65 meters long..381.23.551.66 N
- 10. Multiple ChoiceWhich of the following depict the speed of the blowing ball?ABCD
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