Centripetal force Quiz
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5 questions, one answer each
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1. A mass of 0.50 kg moves in a circle of radius 2.0 m at 6.0 m s⁻¹. What is the resultant force on it?
- A. 1.5 N
- B. 9.0 N
- C. 6.0 N
- D. 18 N
2. An object moves in a circle at constant speed. What is true of its acceleration?
- A. It is zero
- B. It is directed along the velocity
- C. It is directed towards the centre
- D. It is directed away from the centre
3. A body moves in a horizontal circle with angular speed 4.0 rad s⁻¹ and radius 0.50 m. Its mass is 2.0 kg. What is the centripetal force?
- A. 16 N
- B. 4.0 N
- C. 8.0 N
- D. 32 N
4. The radius of a circular path is kept constant but the speed is tripled. What happens to the centripetal force needed?
- A. It is multiplied by 3
- B. It is divided by 3
- C. It is unchanged
- D. It is multiplied by 9
5. A car at the bottom of a dip of radius r at speed v has contact force R. Which equation is correct?
- A. R = mg − mv²/r
- B. R = mg + mv²/r
- C. R = mv²/r
- D. R = mg