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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 542 · 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.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
  2. 2.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  5. 5.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 240 N pushes a cart 3 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Pushing a crate 7 m took 420 J of work. What force was used, in newtons?
  8. 8.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A 7 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 80 N did 720 J of work. How many metres did the object move?
  11. 11.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 500 N pushes a cart 3 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A force of 430 N did 3440 J of work. How many metres did the object move?
  14. 14.🏋️ A force of 370 N pushes a cart 3 m along the floor. How much work is done, in joules?
  15. 15.🏋️ Pushing a crate 5 m took 150 J of work. What force was used, in newtons?
  16. 16.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  17. 17.🏋️ 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?
  18. 18.🏋️ Pushing a crate 1 m took 490 J of work. What force was used, in newtons?
  19. 19.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A force of 100 N did 300 J of work. How many metres did the object move?
  21. 21.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ Pushing a crate 3 m took 1020 J of work. What force was used, in newtons?
  23. 23.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
  25. 25.🏋️ A force of 490 N pushes a cart 5 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 420 N did 1260 J of work. How many metres did the object move?
  27. 27.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  30. 30.🏋️ A force of 270 N did 2430 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 170 N pushes a cart 1 m along the floor. How much work is done, in joules?
  32. 32.🏋️ Pushing a crate 10 m took 2700 J of work. What force was used, in newtons?
  33. 33.🏋️ Pushing a crate 5 m took 2350 J of work. What force was used, in newtons?
  34. 34.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 430 N did 3010 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 100 N pushes a cart 3 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ Pushing a crate 10 m took 1100 J of work. What force was used, in newtons?
  40. 40.🏋️ 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)

Answer key

  1. through a distance
  2. 950
  3. 4
  4. joule (J)
  5. 700
  6. 720
  7. 60
  8. 150
  9. 70
  10. 9
  11. 700
  12. 1500
  13. 8
  14. 1110
  15. 30
  16. no, work stays the same
  17. 300
  18. 490
  19. 350
  20. 3
  21. 3
  22. 340
  23. 250
  24. less effort
  25. 2450
  26. 3
  27. 4
  28. 6
  29. load ÷ effort
  30. 9
  31. 170
  32. 270
  33. 470
  34. 3
  35. 7
  36. 300
  37. 4
  38. 600
  39. 110
  40. 150

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