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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 498 · 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 force of 120 N did 840 J of work. How many metres did the object move?
  2. 2.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
  3. 3.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
  4. 4.🏋️ Pushing a crate 1 m took 20 J of work. What force was used, in newtons?
  5. 5.🏋️ Pushing a crate 10 m took 3000 J of work. What force was used, in newtons?
  6. 6.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A force of 340 N did 2040 J of work. How many metres did the object move?
  8. 8.🏋️ A force of 420 N pushes a cart 3 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  11. 11.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
  13. 13.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  14. 14.🏋️ A force of 440 N pushes a cart 1 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A force of 440 N did 2200 J of work. How many metres did the object move?
  16. 16.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ Pushing a crate 2 m took 780 J of work. What force was used, in newtons?
  20. 20.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A force of 80 N did 160 J of work. How many metres did the object move?
  22. 22.🏋️ A force of 290 N did 2030 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 210 N pushes a cart 6 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 4 m took 640 J of work. What force was used, in newtons?
  25. 25.🏋️ A machine lifts a load of 480 N when you push with 80 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ Pushing a crate 4 m took 1720 J of work. What force was used, in newtons?
  28. 28.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 90 N pushes a cart 8 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 470 N pushes a cart 6 m along the floor. How much work is done, in joules?
  31. 31.🏋️ 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?
  32. 32.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 3 m took 1290 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 350 N pushes a cart 6 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 320 N pushes a cart 9 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 230 N pushes a cart 4 m along the floor. How much work is done, in joules?
  38. 38.🏋️ 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?
  39. 39.🏋️ A force of 180 N did 540 J of work. How many metres did the object move?
  40. 40.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 7
  2. no, work stays the same
  3. through a distance
  4. 20
  5. 300
  6. 550
  7. 6
  8. 1260
  9. 5
  10. less effort
  11. 70
  12. load ÷ effort
  13. joule (J)
  14. 440
  15. 5
  16. 400
  17. 950
  18. 4
  19. 390
  20. 2
  21. 2
  22. 7
  23. 1260
  24. 160
  25. 6
  26. 100
  27. 430
  28. 6
  29. 720
  30. 2820
  31. 30
  32. 3
  33. 430
  34. 2100
  35. 2880
  36. 5
  37. 920
  38. 600
  39. 3
  40. 900

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