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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 7 · 40 questions
TalentJR

Engineer's tip (Less force, more distance): MA = load ÷ effort. Work (J) = force (N) × distance (m); force = work ÷ distance; distance = work ÷ force. Ideal ramp: MA = length ÷ height, effort = load ÷ MA.

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  1. 1.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
  3. 3.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
  4. 4.🏋️ A force of 400 N pushes a cart 2 m along the floor. How much work is done, in joules?
  5. 5.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
  6. 6.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
  10. 10.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ Pushing a crate 1 m took 420 J of work. What force was used, in newtons?
  12. 12.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A force of 70 N pushes a cart 2 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A force of 180 N pushes a cart 10 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A force of 30 N did 150 J of work. How many metres did the object move?
  16. 16.🏋️ A force of 30 N pushes a cart 5 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 9 m took 1710 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 480 N pushes a cart 3 m along the floor. How much work is done, in joules?
  19. 19.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
  20. 20.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A force of 390 N did 3510 J of work. How many metres did the object move?
  22. 22.🏋️ Pushing a crate 6 m took 960 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 470 N did 1410 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
  25. 25.🏋️ Pushing a crate 10 m took 4400 J of work. What force was used, in newtons?
  26. 26.🏋️ Pushing a crate 3 m took 300 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 70 N did 280 J of work. How many metres did the object move?
  28. 28.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A force of 410 N did 820 J of work. How many metres did the object move?
  30. 30.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ Pushing a crate 6 m took 1920 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 10 N did 10 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 350 N did 700 J of work. How many metres did the object move?
  35. 35.🏋️ Pushing a crate 10 m took 3800 J of work. What force was used, in newtons?
  36. 36.🏋️ Pushing a crate 6 m took 720 J of work. What force was used, in newtons?
  37. 37.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 2
  2. joule (J)
  3. through a distance
  4. 800
  5. load ÷ effort
  6. 800
  7. 220
  8. 30
  9. less effort
  10. 140
  11. 420
  12. 6
  13. 140
  14. 1800
  15. 5
  16. 150
  17. 190
  18. 1440
  19. no, work stays the same
  20. 180
  21. 9
  22. 160
  23. 3
  24. 3
  25. 440
  26. 100
  27. 4
  28. 50
  29. 2
  30. 3
  31. 600
  32. 320
  33. 1
  34. 2
  35. 380
  36. 120
  37. 100
  38. 2
  39. 3
  40. 270

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