National 5 (Scotland) · National 5 Physics

Dynamics and Space

22 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 22 questions

  1. Which of these quantities is a vector?
  2. A runner completes one lap of a 400 m track and finishes at the start. What are her distance and displacement?
  3. A cyclist travels 150 m in 12 s. What is her average speed?
  4. A walker covers 3.0 km in 45 minutes. What is the average speed in m/s, to 2 decimal places?
  5. A car accelerates uniformly from rest to 8 m/s in 5 s, as shown on a speed–time graph. What is the distance travelled in that time?
  6. A car speeds up from 4 m/s to 16 m/s in 3 s. What is its acceleration?
  7. A van travelling at 20 m/s brakes uniformly to rest in 8 s. What is its acceleration?
  8. A resultant force of 3000 N acts on a car of mass 1200 kg. What is its acceleration?
  9. A trolley of mass 150 kg is pushed forward by a force of 500 N while friction of 200 N acts against it. What is its acceleration?
  10. Calculate the weight of a 60 kg person on Earth (g = 9.8 N/kg).
  11. The gravitational field strength on the Moon is 1.6 N/kg. What is the weight of a 60 kg astronaut there?
  12. A skydiver reaches terminal velocity. What is true about the forces on her?
  13. A rocket pushes gases backwards and the gases push the rocket forwards. Which law does this illustrate?
  14. A force of 250 N moves a box 12 m along a floor. How much work is done?
  15. What is the gravitational potential energy gained by a 2.0 kg book lifted 5.0 m? (g = 9.8 N/kg)
  16. What is the kinetic energy of a 0.50 kg ball moving at 6.0 m/s?
  17. A ball is dropped from a height of 1.8 m. Ignoring air resistance, what is its speed just before it hits the ground? (g = 9.8 N/kg)
  18. A crane lifts a 200 N load 3.0 m in 5.0 s. What is the power developed?
  19. A ball is thrown horizontally from a cliff at 15 m/s and takes 2.0 s to land. Ignoring air resistance, how far from the base of the cliff does it land?
  20. A rocket of mass 2000 kg has an upward thrust of 30 000 N. Its weight is 19 600 N. What is its initial acceleration?
  21. A 1000 kg car travelling at 20 m/s brakes with a constant force of 4000 N until it stops. What distance does it travel while braking?
  22. On a speed–time graph a vehicle accelerates uniformly from 0 to 10 m/s in 4 s, then travels at a constant 10 m/s for 6 s. What is the total distance?

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