HKDSE (Hong Kong) · Physics

Force and Motion

44 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 44 questions

  1. A car moving at 12 m/s accelerates uniformly at 4 m/s for 8 s. What is its final speed?
  2. A car moving at 3 m/s accelerates uniformly at 3 m/s for 6 s. What is its final speed?
  3. A car moving at 8 m/s accelerates uniformly at 6 m/s for 6 s. What is its final speed?
  4. A car moving at 2 m/s accelerates uniformly at 6 m/s for 3 s. What is its final speed?
  5. A car moving at 4 m/s accelerates uniformly at 2 m/s for 10 s. What is its final speed?
  6. A cyclist starts from rest and accelerates uniformly at 3 m/s. How far does the cyclist travel in 9 s?
  7. A cyclist starts from rest and accelerates uniformly at 8 m/s. How far does the cyclist travel in 4 s?
  8. A cyclist starts from rest and accelerates uniformly at 6 m/s. How far does the cyclist travel in 9 s?
  9. A cyclist starts from rest and accelerates uniformly at 5 m/s. How far does the cyclist travel in 4 s?
  10. A cyclist starts from rest and accelerates uniformly at 4 m/s. How far does the cyclist travel in 5 s?
  11. A net force acts on a 5 kg trolley and gives it an acceleration of 3 m/s. What is the size of the net force?
  12. A net force acts on a 19 kg trolley and gives it an acceleration of 6 m/s. What is the size of the net force?
  13. A net force acts on a 19 kg trolley and gives it an acceleration of 9 m/s. What is the size of the net force?
  14. A net force acts on a 8 kg trolley and gives it an acceleration of 5 m/s. What is the size of the net force?
  15. Find the kinetic energy of a 4 kg object moving at 4 m/s.
  16. Find the kinetic energy of a 2 kg object moving at 8 m/s.
  17. Find the kinetic energy of a 50 kg object moving at 19 m/s.
  18. Find the kinetic energy of a 8 kg object moving at 19 m/s.
  19. A 2 kg box is lifted through a height of 5 m. Taking m/s, how much gravitational potential energy does it gain?
  20. A 5 kg box is lifted through a height of 25 m. Taking m/s, how much gravitational potential energy does it gain?
  21. A 10 kg box is lifted through a height of 29 m. Taking m/s, how much gravitational potential energy does it gain?
  22. A 60 kg box is lifted through a height of 16 m. Taking m/s, how much gravitational potential energy does it gain?
  23. A motor does 1200 J of work in 120 s. What is its average power output?
  24. A motor does 1200 J of work in 30 s. What is its average power output?
  25. A motor does 6000 J of work in 10 s. What is its average power output?
  26. A 4 kg trolley moving at 10 m/s collides with a stationary 1 kg trolley and the two stick together. Find their common speed.
  27. A 1 kg trolley moving at 10 m/s collides with a stationary 4 kg trolley and the two stick together. Find their common speed.
  28. A 2 kg trolley moving at 10 m/s collides with a stationary 3 kg trolley and the two stick together. Find their common speed.
  29. A 3 kg trolley moving at 8 m/s collides with a stationary 5 kg trolley and the two stick together. Find their common speed.
  30. A 3 kg trolley moving at 10 m/s collides with a stationary 2 kg trolley and the two stick together. Find their common speed.
  31. A force of 200 N acts uniformly on an area of 3 m. What is the pressure?
  32. A force of 300 N acts uniformly on an area of 2 m. What is the pressure?
  33. A force of 900 N acts uniformly on an area of 0.1 m. What is the pressure?
  34. A see-saw is balanced about its pivot. A 40 kg child sits 1.2 m from the pivot on one side and a second child sits 0.8 m from the pivot on the other side. Ignoring the see-saw's own weight, what is th…
  35. A see-saw is balanced about its pivot. A 40 kg child sits 1.5 m from the pivot on one side and a second child sits 0.5 m from the pivot on the other side. Ignoring the see-saw's own weight, what is th…
  36. A see-saw is balanced about its pivot. A 50 kg child sits 1.5 m from the pivot on one side and a second child sits 0.6 m from the pivot on the other side. Ignoring the see-saw's own weight, what is th…
  37. A see-saw is balanced about its pivot. A 40 kg child sits 2 m from the pivot on one side and a second child sits 0.8 m from the pivot on the other side. Ignoring the see-saw's own weight, what is the…
  38. A stone is dropped from rest from a height of 45 m. Ignoring air resistance and taking m/s, how long does it take to reach the ground?
  39. A stone is dropped from rest from a height of 180 m. Ignoring air resistance and taking m/s, how long does it take to reach the ground?
  40. A stone is dropped from rest from a height of 125 m. Ignoring air resistance and taking m/s, how long does it take to reach the ground?
  41. Which quantity is a vector?
  42. A car moves at constant velocity along a straight horizontal road. What can be said about the net force on the car?
  43. In a velocity-time graph, what does the area under the line represent?
  44. A man pushes a wall and the wall does not move. According to Newton's third law, what is true about the force the wall exerts on the man?

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