Circular motion Quiz
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5 questions, one answer each
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1. A wheel turns at 3.0 revolutions per second. What is its angular speed?
- A. 3.0 rad s⁻¹
- B. 9.4 rad s⁻¹
- C. 19 rad s⁻¹
- D. 0.33 rad s⁻¹
2. An object moves in a circle of radius 2.0 m at 4.0 m s⁻¹. What is its centripetal acceleration?
- A. 2.0 m s⁻²
- B. 8.0 m s⁻²
- C. 16 m s⁻²
- D. 32 m s⁻²
3. Which statement about the centripetal force on an object in uniform circular motion is correct?
- A. It is perpendicular to the velocity
- B. It acts outwards from the centre
- C. It does work on the object, increasing its speed
- D. It acts in the direction of motion
4. The speed of an object moving in a circle of fixed radius is trebled. By what factor does the centripetal force increase?
- A. 27
- B. 3
- C. 6
- D. 9
5. A 0.50 kg mass moves in a circle of radius 0.40 m with angular speed 5.0 rad s⁻¹. What is the centripetal force?
- A. 1.0 N
- B. 5.0 N
- C. 2.5 N
- D. 10 N