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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 441 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ An 18 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
  4. 4.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
  5. 5.🏋️ A force of 390 N did 1560 J of work. How many metres did the object move?
  6. 6.🏋️ Pushing a crate 2 m took 140 J of work. What force was used, in newtons?
  7. 7.🏋️ Pushing a crate 8 m took 480 J of work. What force was used, in newtons?
  8. 8.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
  9. 9.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 70 N did 280 J of work. How many metres did the object move?
  11. 11.🏋️ A force of 30 N pushes a cart 5 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 50 N did 250 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 370 N did 1850 J of work. How many metres did the object move?
  14. 14.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A force of 220 N pushes a cart 7 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ A force of 30 N pushes a cart 7 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 50 N pushes a cart 6 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 100 N pushes a cart 6 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A force of 120 N pushes a cart 6 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 290 N did 580 J of work. How many metres did the object move?
  23. 23.🏋️ Pushing a crate 5 m took 600 J of work. What force was used, in newtons?
  24. 24.🏋️ Pushing a crate 3 m took 420 J of work. What force was used, in newtons?
  25. 25.🏋️ A force of 250 N pushes a cart 7 m along the floor. How much work is done, in joules?
  26. 26.🏋️ 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?
  27. 27.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  29. 29.🏋️ A force of 340 N did 2040 J of work. How many metres did the object move?
  30. 30.🏋️ Pushing a crate 9 m took 4320 J of work. What force was used, in newtons?
  31. 31.🏋️ Pushing a crate 6 m took 2760 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 9 m took 3150 J of work. What force was used, in newtons?
  33. 33.🏋️ A 1 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
  37. 37.🏋️ A 3 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 force of 110 N did 550 J of work. How many metres did the object move?
  39. 39.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 440 N did 3080 J of work. How many metres did the object move?

Answer key

  1. 120
  2. 180
  3. no, work stays the same
  4. load ÷ effort
  5. 4
  6. 70
  7. 60
  8. through a distance
  9. 2
  10. 4
  11. 150
  12. 5
  13. 5
  14. 2
  15. 1540
  16. 2
  17. 130
  18. 210
  19. 300
  20. 600
  21. 720
  22. 2
  23. 120
  24. 140
  25. 1750
  26. 180
  27. 4
  28. less effort
  29. 6
  30. 480
  31. 460
  32. 350
  33. 40
  34. 350
  35. 1000
  36. joule (J)
  37. 150
  38. 5
  39. 5
  40. 7

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