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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 88 · 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.🏋️ Pushing a crate 2 m took 440 J of work. What force was used, in newtons?
  2. 2.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ A force of 220 N did 1320 J of work. How many metres did the object move?
  6. 6.🏋️ Pushing a crate 6 m took 1020 J of work. What force was used, in newtons?
  7. 7.🏋️ A force of 180 N pushes a cart 3 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 390 N did 3900 J of work. How many metres did the object move?
  11. 11.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 280 N did 560 J of work. How many metres did the object move?
  13. 13.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A force of 180 N did 1260 J of work. How many metres did the object move?
  15. 15.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A force of 60 N did 360 J of work. How many metres did the object move?
  17. 17.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
  22. 22.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
  23. 23.🏋️ 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?
  24. 24.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ Pushing a crate 8 m took 640 J of work. What force was used, in newtons?
  26. 26.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ Pushing a crate 2 m took 80 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 150 N did 750 J of work. How many metres did the object move?
  30. 30.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A 17 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ Pushing a crate 3 m took 780 J of work. What force was used, in newtons?
  33. 33.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
  34. 34.🏋️ A 14 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 longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  36. 36.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  39. 39.🏋️ A force of 300 N did 3000 J of work. How many metres did the object move?
  40. 40.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 220
  2. 330
  3. 2
  4. 190
  5. 6
  6. 170
  7. 540
  8. 280
  9. 260
  10. 10
  11. 5
  12. 2
  13. 4
  14. 7
  15. 300
  16. 6
  17. 4
  18. 350
  19. 100
  20. 550
  21. through a distance
  22. load ÷ effort
  23. 70
  24. 800
  25. 80
  26. 300
  27. 200
  28. 40
  29. 5
  30. 150
  31. 850
  32. 260
  33. joule (J)
  34. 700
  35. less effort
  36. 80
  37. 5
  38. no, work stays the same
  39. 10
  40. 400

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