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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 720 · 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 machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A force of 340 N did 2380 J of work. How many metres did the object move?
  3. 3.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) metre (m) (d) watt hour
  5. 5.🏋️ A force of 140 N pushes a cart 6 m along the floor. How much work is done, in joules?
  6. 6.🏋️ Pushing a crate 6 m took 2580 J of work. What force was used, in newtons?
  7. 7.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
  8. 8.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
  9. 9.🏋️ Pushing a crate 2 m took 420 J of work. What force was used, in newtons?
  10. 10.🏋️ Pushing a crate 4 m took 360 J of work. What force was used, in newtons?
  11. 11.🏋️ Pushing a crate 5 m took 1850 J of work. What force was used, in newtons?
  12. 12.🏋️ Pushing a crate 7 m took 350 J of work. What force was used, in newtons?
  13. 13.🏋️ A force of 120 N pushes a cart 7 m along the floor. How much work is done, in joules?
  14. 14.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  15. 15.🏋️ A force of 420 N pushes a cart 8 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A force of 10 N pushes a cart 3 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 300 N did 2400 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 460 N did 4600 J of work. How many metres did the object move?
  20. 20.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 90 N did 180 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 190 N pushes a cart 2 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 320 N pushes a cart 9 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Pushing a crate 9 m took 180 J of work. What force was used, in newtons?
  28. 28.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 280 N did 1680 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 350 N did 700 J of work. How many metres did the object move?
  31. 31.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A force of 70 N pushes a cart 1 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Pushing a crate 5 m took 800 J of work. What force was used, in newtons?
  35. 35.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
  37. 37.🏋️ A force of 250 N pushes a cart 7 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 80 N pushes a cart 8 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 5
  2. 7
  3. 4
  4. joule (J)
  5. 840
  6. 430
  7. load ÷ effort
  8. less effort
  9. 210
  10. 90
  11. 370
  12. 50
  13. 840
  14. through a distance
  15. 3360
  16. 4
  17. 30
  18. 8
  19. 10
  20. 650
  21. 5
  22. 2
  23. 380
  24. 2
  25. 2880
  26. 5
  27. 20
  28. 3
  29. 6
  30. 2
  31. 560
  32. 70
  33. 6
  34. 160
  35. 650
  36. no, work stays the same
  37. 1750
  38. 640
  39. 3
  40. 650

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