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Circular motion

Class 11 · Physics · 5 questions

Name: ____________________   Date: ____________

  1. The direction of centripetal force is:

    • A Tangent to the circle
    • B Away from the centre
    • C Towards the centre
    • D Along the velocity

  2. An object moves in a circle of radius 2 m at 4 m/s. What is its centripetal acceleration?

    • A 4 m/s2
    • B 16 m/s2
    • C 2 m/s2
    • D 8 m/s2

  3. Angular velocity of a wheel making 60 revolutions per minute is:

    • A 2 pi rad/s
    • B pi rad/s
    • C 120 pi rad/s
    • D 60 rad/s

  4. The relation between linear speed v and angular speed omega is:

    • A v = r / omega
    • B v = r omega
    • C v = omega / r
    • D v = omega2 r

  5. Artificial gravity in a rotating space station comes from:

    • A Nuclear force
    • B Magnetism
    • C Air pressure
    • D Centripetal force from the floor

Answer key

1. C, 2. D, 3. A, 4. B, 5. D

  1. Centripetal force points to the centre of the circle.

  2. a = v2 / r = 16 / 2 = 8 m/s2.

  3. 60 rev/min = 1 rev/s = 2 pi rad/s.

  4. v = r omega.

  5. The floor pushes people towards the axis, which feels like weight.