6.3.2 Centripetal force and centripetal acceleration Quiz: Pearson Edexcel Physics, Unit 6

The 20 questions

1. In what direction does centripetal acceleration act on an object moving in a circle?

   • Opposite to motion
   • Towards the centre
   • Away from centre
   • Along the tangent

2. What parameter of velocity changes continuously for an object moving in a circle at constant speed?

   • Speed
   • Frequency
   • Direction
   • Magnitude

3. Which equation gives the centripetal force F on a mass m moving at speed v in a circle of radius r?

   • F = m v^2 r
   • F = m v r^2
   • F = m v / r
   • F = m v^2 / r

4. Which expression is equivalent to centripetal acceleration for an object moving on a circle of radius r with angular velocity omega?

   • a = r omega^2
   • a = omega / r
   • a = r^2 omega
   • a = r / omega^2

5. What force provides the centripetal force for a satellite orbiting Earth?

   • Frictional force
   • Gravitational force
   • Electrostatic force
   • Normal contact force

6. A 0.50 kg ball moves in a horizontal circle of radius 0.80 m at a speed of 4.0 m s^-1. What is the centripetal force?

   • 10 N
   • 40 N
   • 20 N
   • 5.0 N

7. A 1200 kg car travels round a bend of radius 50 m at 15 m s^-1 on a level road. What is the frictional force providing the centripetal force?

   • 18000 N
   • 360 N
   • 540 N
   • 5400 N

8. An object moves in a circle of radius 5.0 m at a constant speed of 10 m s^-1. What is its centripetal acceleration?

   • 50 m s^-2
   • 20 m s^-2
   • 10 m s^-2
   • 2.0 m s^-2

9. An object moves in a circle of radius 0.40 m with angular velocity 6.0 rad s^-1. What is its centripetal acceleration?

   • 2.4 m s^-2
   • 14 m s^-2
   • 1.5 m s^-2
   • 90 m s^-2

10. If the speed of an object in a circle of constant radius doubles, centripetal force increases by what factor?

    • 0.5
    • 4
    • 2
    • 8

11. If the orbital radius of an object moving at constant speed is halved, centripetal force increases by what factor?

    • 2
    • 0.25
    • 4
    • 0.5

12. A stone of mass 0.20 kg is swung on a string in a horizontal circle of radius 0.50 m. The tension in the string is 8.0 N. What is the speed of the stone?

    • 20 m s^-1
    • 2.0 m s^-1
    • 0.40 m s^-1
    • 4.5 m s^-1

13. A 2.0 kg mass on a string moves in a horizontal circle of radius 1.2 m with period 2.0 s. What is the tension in the string?

    • 47 N
    • 4.8 N
    • 24 N
    • 12 N

14. A 0.10 kg bob on a string of length 0.50 m moves in a horizontal circle with the string at 30 degrees to the vertical. What is the centripetal force on the bob?

    • 0.57 N
    • 0.98 N
    • 0.28 N
    • 1.1 N

15. In the conical pendulum of the previous case, what is the tension in the string?

    • 0.98 N
    • 0.57 N
    • 1.1 N
    • 2.0 N

16. For an object in uniform circular motion, the radius is halved and the speed is doubled. By what factor does the centripetal force change?

    • Sixteen times larger
    • Four times larger
    • Twice as large
    • Eight times larger

17. A ball of radius 1.5 m completes one revolution in 3.0 s. What is its centripetal acceleration?

    • 2.2 m s^-2
    • 0.50 m s^-2
    • 13 m s^-2
    • 6.6 m s^-2

18. Why does an object moving at constant speed in a circle accelerate?

    • Speed changes continuously
    • Kinetic energy changes
    • Mass changes continuously
    • Velocity changes direction

19. In an inertial reference frame, what type of force is centrifugal force considered to be?

    • Real force
    • Centripetal force
    • Fictitious force
    • Gravitational force

20. An object moves in a circle of radius 0.60 m with period 1.2 s. What is its speed?

    • 1.6 m s^-1
    • 6.3 m s^-1
    • 0.50 m s^-1
    • 3.1 m s^-1

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