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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 994 · 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 machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ 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
  3. 3.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ A 12 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.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ 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?
  10. 10.🏋️ 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?
  11. 11.🏋️ A force of 270 N did 2700 J of work. How many metres did the object move?
  12. 12.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1750 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A machine lifts a load of 570 N when you push with 190 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  17. 17.🏋️ Pushing a crate 8 m took 720 J of work. What force was used, in newtons?
  18. 18.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 420 N did 420 J of work. How many metres did the object move?
  23. 23.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ Pushing a crate 6 m took 2460 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 470 N did 470 J of work. How many metres did the object move?
  28. 28.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A force of 70 N did 210 J of work. How many metres did the object move?
  30. 30.🏋️ Pushing a crate 3 m took 990 J of work. What force was used, in newtons?
  31. 31.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A force of 370 N pushes a cart 1 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A 10 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A force of 370 N did 1480 J of work. How many metres did the object move?
  37. 37.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  38. 38.🏋️ Pushing a crate 7 m took 2170 J of work. What force was used, in newtons?
  39. 39.🏋️ 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?
  40. 40.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 2
  2. no, work stays the same
  3. 340
  4. 240
  5. 720
  6. 800
  7. 4
  8. 6
  9. 200
  10. 130
  11. 10
  12. 350
  13. 2
  14. 3
  15. 700
  16. load ÷ effort
  17. 90
  18. 5
  19. 2
  20. 3
  21. 60
  22. 1
  23. 4
  24. 4
  25. 60
  26. 410
  27. 1
  28. 800
  29. 3
  30. 330
  31. 900
  32. 100
  33. 370
  34. 500
  35. 400
  36. 4
  37. joule (J)
  38. 310
  39. 120
  40. 700

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