Centripetal acceleration and force Quiz
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5 questions, one answer each
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1. A car takes a bend at 20 m s⁻¹ and the radius is 50 m. What is its centripetal acceleration?
- A. 0.40 m s⁻²
- B. 8.0 m s⁻²
- C. 20 m s⁻²
- D. 1000 m s⁻²
2. A satellite's speed in a circular orbit is constant. Which statement is correct?
- A. It accelerates towards the centre of the orbit
- B. Its acceleration is zero
- C. It accelerates in the direction of its velocity
- D. It accelerates away from the centre
3. A mass moves in a horizontal circle of radius r at angular speed ω. The angular speed is doubled at the same radius. What happens to the centripetal force needed?
- A. It is doubled
- B. It is halved
- C. It is multiplied by 4
- D. It is unchanged
4. A 0.50 kg mass moves in a circle of radius 0.40 m at 2.0 revolutions per second. What is the centripetal force?
- A. 0.50 N
- B. 2.5 N
- C. 63 N
- D. 32 N
5. Which statement about centripetal force is correct?
- A. It acts outwards from the centre
- B. It is the resultant of real forces acting towards the centre
- C. It does work on the object, increasing its speed
- D. It is an extra force added to a free-body diagram