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- 1. Multiple Choice
What force keeps an object moving in a circle?
centripetal force (inward)
centrifugal force (outward)
- 2. Multiple ChoiceThe velocity is always _____ to the line of a circle.outwardstowards the centertangentfaster
- 3. Multiple ChoiceWhat type of acceleration does an object moving with constant speed in a circular path experience?
A) free fall
B) constant acceleration
C) linear acceleration
D) centripetal accelerationABCD - 4. Multiple ChoiceAn object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors.
A) Both vectors point in the same direction.
B) The vectors point in opposite directions.
C) The vectors are perpendicular.
D) The question is meaningless, since the acceleration is zeroABCD - 5. Multiple ChoiceIs it possible for an object moving with a constant speed to accelerate? Explain.
A) No, if the speed is constant then the acceleration is equal to zero. B) No, an object can accelerate only if there is a net force acting on it.
C) Yes, although the speed is constant, the direction of the velocity can be changing.
D) Yes, if an object is moving it can experience accelerationABCD - 6. Multiple ChoiceAn object moves with a constant speed of 30 m/s on a circular track of radius 150 m. What is the magnitude of the acceleration of the object?
A) zero
B) 0.17 m/s2
C) 5.0 m/s2
D) 6.0 m/s2ABCD - 7. Multiple ChoiceTwo masses m and M are separated by a distance d. If the distance between the masses is increased to 3d, how does the gravitational force between them change?becomes 1/3 as great1/9 as great3x greater9x greater
- 8. Multiple ChoiceWhen an object experiences uniform circular motion, the direction of the acceleration is
A) in the same direction as the velocity vector.
B) in the opposite direction of the velocity vector.
C) is directed toward the center of the circular path. D) is directed away from the center of the circular path.ABCD - 9. Multiple ChoiceA 0.50-kg mass is attached to the end of a 1.0-m string. The system is whirled in a horizontal circular path. If the maximum tension that the string can withstand is 350 N. What is the maximum speed of the mass if the string is not to break?
A) 700 m/s
B) 26 m/s
C) 19 m/s
D) 13 m/sABCD - 10. Multiple ChoiceWhich one of the following statements concerning the two “gravitational constants” G, the universal constant, and g the magnitude of the acceleration due to the gravity is true?The value for G and g do not depend on location.The value of G is the same everywhere in the universe, but the value of g is not.The value of G and g are equal on the surface of any planet, but in general, vary with location in the universe.
- 11. Multiple Choice
A particle P is moving in a circle with uniform speed. Which one of the following diagrams correctly shows the direction of the acceleration a and velocity v of the particle at one instant of time?ABCD - 12. Multiple ChoiceWhat is the direction of the velocity at point B, if the ball is revolving clockwise?uprightdownleft
- 13. Multiple ChoiceWhat is the direction of the velocity at point A, if the ball is revolving clockwise?uprightdownleft
- 14. Multiple ChoiceWhich represents the acceleration of the ball?ABCD
- 15. Multiple Choice
Bruno the bat has a mass of 0.58 kg and flies at a speed of 0.8 m/s in circle of radius 0.5 m. What is his acceleration?
0.25 m/s2
1.3 m/s2
1.6 m/s2
0.74 m/s2
- 16. Multiple ChoiceWhich statement is true about an object that is traveling in uniform circular motion?The speed of the object varies.The net force on the object is directed toward the center of the circular path.The direction of the object's velocity is constant.The net force on the object is directed away from the center of the circular path.
- 17. Multiple Choice
A race car completes three laps of a circular track with a radius of 35 m in 9.0 seconds. Determine the speed of the car.
3.9 m/s
73.3 m/s
24.4 m/s
1.0 m/s
- 18. Multiple ChoiceWhy do objects experience centripetal acceleration?Because they are speeding up as they move in a circleBecause they are constantly changing direction and the net change is directed inwardBecause they are constantly changing both speed and directionBecause when you have 100 people pedaling, you can speed up more easily.
- 19. 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
- 20. 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
- Answer choicesTagsAnswer choicesTags