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Angular displacement and angular velocityEdexcel International A Level Physics: Flashcards

What these 12 flashcards ask

  • Define the radian.
  • How many radians are in a full circle?
  • Convert degrees to radians.
  • Convert radians to degrees.
  • What is angular displacement?
  • Define angular velocity.
  • Give ω in terms of the period T.
  • Give ω in terms of frequency f.
  • State the relationship between linear speed and angular velocity.
  • Convert rpm to rad s⁻¹.
  • Do all points on a rotating disc have the same ω?
  • What is 90° in radians?

Exam questions on Angular displacement and angular velocity

  1. A fairground carousel rotates at a constant rate, making one complete revolution every 8.0 s. A child sits on a horse 4.0 m from the axis of rotation.
    Calculate the angle through which the child turns in 3.0 s, giving your answer in radians and in degrees.2 marks
  2. A radar dish rotates at a constant rate, making 15 complete revolutions per minute. The controller divides each revolution into equal sectors, each covering 72°.
    Calculate the period of rotation of the dish and the time taken for it to turn through one sector.2 marks
  3. A hard disk drive platter of radius 4.7 cm spins at a constant 7200 revolutions per minute.
    Calculate the angular velocity of the platter, the period of its rotation, and the speed of a point on its rim.3 marks
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Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).