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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 892 · 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 240 N did 1920 J of work. How many metres did the object move?
  2. 2.🏋️ 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?
  3. 3.🏋️ Pushing a crate 3 m took 750 J of work. What force was used, in newtons?
  4. 4.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  6. 6.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
  8. 8.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  11. 11.🏋️ Pushing a crate 1 m took 390 J of work. What force was used, in newtons?
  12. 12.🏋️ A machine lifts a load of 1080 N when you push with 180 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ Pushing a crate 5 m took 2150 J of work. What force was used, in newtons?
  15. 15.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A force of 390 N did 2340 J of work. How many metres did the object move?
  17. 17.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) metre (m) (d) joule (J)
  19. 19.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Pushing a crate 3 m took 840 J of work. What force was used, in newtons?
  22. 22.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A force of 30 N pushes a cart 3 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 450 N pushes a cart 8 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 6 m took 2580 J of work. What force was used, in newtons?
  27. 27.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A force of 430 N pushes a cart 8 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 480 N did 1440 J of work. How many metres did the object move?
  30. 30.🏋️ Pushing a crate 10 m took 1200 J of work. What force was used, in newtons?
  31. 31.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
  32. 32.🏋️ A force of 60 N did 540 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 3 m took 1140 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 400 N pushes a cart 10 m along the floor. How much work is done, in joules?
  35. 35.🏋️ Pushing a crate 1 m took 460 J of work. What force was used, in newtons?
  36. 36.🏋️ 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?
  37. 37.🏋️ 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?
  38. 38.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A force of 370 N pushes a cart 7 m along the floor. How much work is done, in joules?
  40. 40.🏋️ Pushing a crate 4 m took 1680 J of work. What force was used, in newtons?

Answer key

  1. 8
  2. 300
  3. 250
  4. 100
  5. load ÷ effort
  6. 4
  7. no, work stays the same
  8. 4
  9. 1000
  10. less effort
  11. 390
  12. 6
  13. 600
  14. 430
  15. 140
  16. 6
  17. 250
  18. joule (J)
  19. 4
  20. 6
  21. 280
  22. 6
  23. 850
  24. 90
  25. 3600
  26. 430
  27. 120
  28. 3440
  29. 3
  30. 120
  31. through a distance
  32. 9
  33. 380
  34. 4000
  35. 460
  36. 140
  37. 400
  38. 900
  39. 2590
  40. 420

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