OCR A Level Physics

Topic Questions

A LevelPhysicsOCRTopic Questions5. Newtonian World & Astrophysics5.4 Circular Motion

5.4 Circular Motion

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1
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A toy car is travelling in a circular path. The toy car completes 18 revolutions in 3 s.

Which of the following gives the angular velocity, in rad s−1, of the toy car?

  • fraction numerator 3 space cross times space straight pi over denominator 18 end fraction

  • fraction numerator 3 space cross times space 2 space straight pi over denominator 18 end fraction

  • fraction numerator 18 space cross times space straight pi over denominator 3 end fraction

  • fraction numerator 18 space cross times space 2 straight pi over denominator 3 end fraction

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2
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A scientist states: “The radius of the orbit of the Earth around the Sun is decreasing by a small amount each year, however, the time period of the orbit remains constant.”

Which row of the table is correct if the statement is true?

 

Angular velocity of Earth

Speed of Earth

A

decreasing

decreasing

B

decreasing

constant

C

constant

constant

D

constant

decreasing

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3
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A metal ball of mass 0.55 kg is swung round on the end of a string so that the ball moves in a horizontal circle of radius 1.5 m.

The ball travels at a constant speed of 6.2 m s−1

What is the time taken (seconds) for the string to turn through an angle of 200°?

  • 0.24 s

  • 0.44 s

  • 0.64 s

  • 0.84 s

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4
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Saturn and its moon may be considered to be isolated in space with their masses concentrated at their centres. The orbit of the moon around Saturn is circular with a radius of 4.84 × 105 km. The period of the orbit is 29.3 days.

What is the angular velocity of the Moon in its orbit around Saturn?

  •  2.48 × 10−6 rad s−1

  • 3.48 × 10−6 rad s−1

  • 4.48 × 10−6 rad s−1

  • 5.48 × 10−6 rad s−1

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