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Mechanics

40 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 40 questions

  1. A ball is thrown vertically upward at 28 m/s. Taking m/s and ignoring air resistance, what is the maximum height reached above the launch point?
  2. A ball is thrown vertically upward at 7 m/s. Taking m/s and ignoring air resistance, what is the maximum height reached above the launch point?
  3. A ball is thrown vertically upward at 21 m/s. Taking m/s and ignoring air resistance, what is the maximum height reached above the launch point?
  4. A ball is thrown vertically upward at 35 m/s. Taking m/s and ignoring air resistance, what is the maximum height reached above the launch point?
  5. A stone is thrown horizontally at 8 m/s from a cliff 19.6 m high. Taking m/s, how far from the base of the cliff does it land?
  6. A stone is thrown horizontally at 12 m/s from a cliff 19.6 m high. Taking m/s, how far from the base of the cliff does it land?
  7. A stone is thrown horizontally at 20 m/s from a cliff 4.9 m high. Taking m/s, how far from the base of the cliff does it land?
  8. A stone is thrown horizontally at 12 m/s from a cliff 4.9 m high. Taking m/s, how far from the base of the cliff does it land?
  9. A block of mass 10 kg slides down a smooth slope inclined at 30 to the horizontal. Taking m/s, what is its acceleration?
  10. A block of mass 5 kg slides down a smooth slope inclined at 30 to the horizontal. Taking m/s, what is its acceleration?
  11. A 10 kg crate on a rough horizontal floor is pushed by a horizontal force of 60 N. The coefficient of kinetic friction is 0.25. Taking m/s, find the acceleration.
  12. A 5 kg crate on a rough horizontal floor is pushed by a horizontal force of 40 N. The coefficient of kinetic friction is 0.5. Taking m/s, find the acceleration.
  13. A 2 kg crate on a rough horizontal floor is pushed by a horizontal force of 50 N. The coefficient of kinetic friction is 0.25. Taking m/s, find the acceleration.
  14. A 2 kg crate on a rough horizontal floor is pushed by a horizontal force of 60 N. The coefficient of kinetic friction is 0.2. Taking m/s, find the acceleration.
  15. A 2 kg crate on a rough horizontal floor is pushed by a horizontal force of 60 N. The coefficient of kinetic friction is 0.5. Taking m/s, find the acceleration.
  16. A 1 kg object moves in a horizontal circle of radius 0.5 m at a constant speed of 5 m/s. What is the centripetal force acting on it?
  17. A 4 kg object moves in a horizontal circle of radius 4 m at a constant speed of 5 m/s. What is the centripetal force acting on it?
  18. A 1 kg object moves in a horizontal circle of radius 2 m at a constant speed of 6 m/s. What is the centripetal force acting on it?
  19. A 4 kg object moves in a horizontal circle of radius 3 m at a constant speed of 6 m/s. What is the centripetal force acting on it?
  20. A 0.5 kg object moves in a horizontal circle of radius 3 m at a constant speed of 5 m/s. What is the centripetal force acting on it?
  21. An object moves uniformly on a circle of radius 5 m with a period of 4 s. What is its speed?
  22. An object moves uniformly on a circle of radius 5 m with a period of 5 s. What is its speed?
  23. An object moves uniformly on a circle of radius 5 m with a period of 8 s. What is its speed?
  24. An object moves uniformly on a circle of radius 2 m with a period of 5 s. What is its speed?
  25. A spring of spring constant 200 N/m is stretched by 0.2 m. How much elastic potential energy does it store?
  26. A spring of spring constant 200 N/m is stretched by 0.05 m. How much elastic potential energy does it store?
  27. A spring of spring constant 100 N/m is stretched by 0.05 m. What is the restoring force?
  28. A spring of spring constant 100 N/m is stretched by 0.2 m. What is the restoring force?
  29. A spring of spring constant 200 N/m is stretched by 0.1 m. How much elastic potential energy does it store?
  30. A 9 kg mass hangs on a spring of constant 4 N/m and oscillates vertically. Find the period of oscillation.
  31. A 4 kg mass hangs on a spring of constant 1 N/m and oscillates vertically. Find the period of oscillation.
  32. A pendulum bob is released from rest at a height of 44.1 m above the lowest point of its swing. Ignoring air resistance and taking m/s, what is its speed at the lowest point?
  33. A pendulum bob is released from rest at a height of 78.4 m above the lowest point of its swing. Ignoring air resistance and taking m/s, what is its speed at the lowest point?
  34. A pendulum bob is released from rest at a height of 19.6 m above the lowest point of its swing. Ignoring air resistance and taking m/s, what is its speed at the lowest point?
  35. A pendulum bob is released from rest at a height of 4.9 m above the lowest point of its swing. Ignoring air resistance and taking m/s, what is its speed at the lowest point?
  36. A satellite moves in a circular orbit around the Earth at constant speed. Which statement is correct?
  37. Two objects of different mass are dropped from the same height in a vacuum. Which statement is correct?
  38. A person stands in a lift accelerating upward. Compared with the person's weight, the normal force from the floor is
  39. In an elastic collision between two bodies, which quantity is conserved in addition to momentum?
  40. Which of these is a unit of momentum?

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