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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 670 · 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 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
  4. 4.🏋️ A force of 30 N did 30 J of work. How many metres did the object move?
  5. 5.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
  6. 6.🏋️ Pushing a crate 1 m took 130 J of work. What force was used, in newtons?
  7. 7.🏋️ Pushing a crate 6 m took 780 J of work. What force was used, in newtons?
  8. 8.🏋️ Pushing a crate 1 m took 330 J of work. What force was used, in newtons?
  9. 9.🏋️ A force of 340 N did 3060 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 400 N did 4000 J of work. How many metres did the object move?
  11. 11.🏋️ Pushing a crate 4 m took 1640 J of work. What force was used, in newtons?
  12. 12.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
  13. 13.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
  14. 14.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A force of 80 N pushes a cart 8 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 70 N did 490 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 280 N pushes a cart 7 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Pushing a crate 2 m took 860 J of work. What force was used, in newtons?
  19. 19.🏋️ Pushing a crate 10 m took 500 J of work. What force was used, in newtons?
  20. 20.🏋️ Pushing a crate 10 m took 3200 J of work. What force was used, in newtons?
  21. 21.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
  22. 22.🏋️ A force of 470 N did 4700 J of work. How many metres did the object move?
  23. 23.🏋️ Pushing a crate 1 m took 460 J of work. What force was used, in newtons?
  24. 24.🏋️ 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?
  25. 25.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A force of 260 N did 260 J of work. How many metres did the object move?
  27. 27.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A force of 160 N did 1280 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 400 N pushes a cart 9 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ Pushing a crate 10 m took 3800 J of work. What force was used, in newtons?
  33. 33.🏋️ Pushing a crate 9 m took 180 J of work. What force was used, in newtons?
  34. 34.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ 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?
  36. 36.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
  39. 39.🏋️ A machine lifts a load of 360 N when you push with 90 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?

Answer key

  1. 300
  2. 250
  3. load ÷ effort
  4. 1
  5. joule (J)
  6. 130
  7. 130
  8. 330
  9. 9
  10. 10
  11. 410
  12. through a distance
  13. no, work stays the same
  14. 440
  15. 640
  16. 7
  17. 1960
  18. 430
  19. 50
  20. 320
  21. less effort
  22. 10
  23. 460
  24. 130
  25. 600
  26. 1
  27. 500
  28. 8
  29. 3600
  30. 4
  31. 2
  32. 380
  33. 20
  34. 2
  35. 270
  36. 80
  37. 1000
  38. 150
  39. 4
  40. 6

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