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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 266 · 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.

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  1. 1.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
  2. 2.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ Pushing a crate 2 m took 340 J of work. What force was used, in newtons?
  4. 4.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
  6. 6.🏋️ A force of 350 N pushes a cart 4 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
  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.🏋️ A force of 500 N pushes a cart 2 m along the floor. How much work is done, in joules?
  10. 10.🏋️ Pushing a crate 5 m took 1050 J of work. What force was used, in newtons?
  11. 11.🏋️ 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?
  12. 12.🏋️ Pushing a crate 7 m took 2170 J of work. What force was used, in newtons?
  13. 13.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
  14. 14.🏋️ A force of 470 N did 4700 J of work. How many metres did the object move?
  15. 15.🏋️ A force of 110 N did 1100 J of work. How many metres did the object move?
  16. 16.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A force of 460 N pushes a cart 7 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 30 N pushes a cart 5 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Pushing a crate 10 m took 1600 J of work. What force was used, in newtons?
  22. 22.🏋️ A machine lifts a load of 1080 N when you push with 180 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A force of 30 N did 210 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 50 N pushes a cart 10 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 230 N did 1840 J of work. How many metres did the object move?
  27. 27.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A force of 390 N pushes a cart 9 m along the floor. How much work is done, in joules?
  31. 31.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 8 m took 3920 J of work. What force was used, in newtons?
  33. 33.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A machine lifts a load of 200 N when you push with 50 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ Pushing a crate 9 m took 1260 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 460 N did 4600 J of work. How many metres did the object move?
  38. 38.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A force of 340 N did 1360 J of work. How many metres did the object move?
  40. 40.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?

Answer key

  1. load ÷ effort
  2. 5
  3. 170
  4. 90
  5. joule (J)
  6. 1400
  7. through a distance
  8. less effort
  9. 1000
  10. 210
  11. 130
  12. 310
  13. no, work stays the same
  14. 10
  15. 10
  16. 900
  17. 3220
  18. 3
  19. 150
  20. 3
  21. 160
  22. 6
  23. 200
  24. 7
  25. 500
  26. 8
  27. 540
  28. 3
  29. 150
  30. 3510
  31. 150
  32. 490
  33. 150
  34. 4
  35. 150
  36. 140
  37. 10
  38. 2
  39. 4
  40. 3

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