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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 888 · 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.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
  7. 7.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ Pushing a crate 7 m took 2660 J of work. What force was used, in newtons?
  9. 9.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 20 N pushes a cart 7 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ Pushing a crate 1 m took 90 J of work. What force was used, in newtons?
  13. 13.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3900 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  15. 15.🏋️ 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?
  16. 16.🏋️ A machine lifts a load of 660 N when you push with 110 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
  18. 18.🏋️ Pushing a crate 9 m took 1260 J of work. What force was used, in newtons?
  19. 19.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) watt hour (d) metre (m)
  20. 20.🏋️ Pushing a crate 8 m took 320 J of work. What force was used, in newtons?
  21. 21.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ Pushing a crate 1 m took 470 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 80 N did 560 J of work. How many metres did the object move?
  24. 24.🏋️ Pushing a crate 4 m took 280 J of work. What force was used, in newtons?
  25. 25.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ Pushing a crate 3 m took 60 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 460 N pushes a cart 8 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A force of 160 N did 480 J of work. How many metres did the object move?
  34. 34.🏋️ Pushing a crate 4 m took 880 J of work. What force was used, in newtons?
  35. 35.🏋️ Pushing a crate 1 m took 220 J of work. What force was used, in newtons?
  36. 36.🏋️ Pushing a crate 8 m took 1920 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 360 N pushes a cart 5 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 290 N pushes a cart 2 m along the floor. How much work is done, in joules?
  39. 39.🏋️ Pushing a crate 7 m took 2940 J of work. What force was used, in newtons?
  40. 40.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 500
  2. 2
  3. 600
  4. 80
  5. 250
  6. no, work stays the same
  7. 500
  8. 380
  9. 170
  10. 140
  11. 6
  12. 90
  13. 650
  14. load ÷ effort
  15. 330
  16. 6
  17. through a distance
  18. 140
  19. joule (J)
  20. 40
  21. 4
  22. 470
  23. 7
  24. 70
  25. 400
  26. 4
  27. 6
  28. 800
  29. 950
  30. 120
  31. 20
  32. 3680
  33. 3
  34. 220
  35. 220
  36. 240
  37. 1800
  38. 580
  39. 420
  40. 800

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