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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 99 · 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.🏋️ Pushing a crate 8 m took 1440 J of work. What force was used, in newtons?
  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 machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ 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)
  6. 6.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  8. 8.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ Pushing a crate 1 m took 170 J of work. What force was used, in newtons?
  10. 10.🏋️ A force of 160 N pushes a cart 10 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A force of 150 N did 150 J of work. How many metres did the object move?
  12. 12.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  13. 13.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
  15. 15.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ A force of 90 N did 900 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 480 N pushes a cart 6 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 400 N did 1200 J of work. How many metres did the object move?
  21. 21.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ 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?
  24. 24.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A force of 310 N did 1860 J of work. How many metres did the object move?
  26. 26.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 290 N pushes a cart 10 m along the floor. How much work is done, in joules?
  28. 28.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ Pushing a crate 4 m took 1480 J of work. What force was used, in newtons?
  30. 30.🏋️ Pushing a crate 7 m took 3360 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 400 N pushes a cart 1 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 360 N pushes a cart 9 m along the floor. How much work is done, in joules?
  33. 33.🏋️ Pushing a crate 2 m took 60 J of work. What force was used, in newtons?
  34. 34.🏋️ 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?
  35. 35.🏋️ Pushing a crate 1 m took 130 J of work. What force was used, in newtons?
  36. 36.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 240 N pushes a cart 1 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 190 N did 1140 J of work. How many metres did the object move?
  39. 39.🏋️ A force of 190 N did 570 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 210 N did 1890 J of work. How many metres did the object move?

Answer key

  1. 180
  2. no, work stays the same
  3. 6
  4. 2
  5. 950
  6. 4
  7. load ÷ effort
  8. 3
  9. 170
  10. 1600
  11. 1
  12. joule (J)
  13. 3
  14. less effort
  15. 5
  16. 400
  17. 140
  18. 10
  19. 2880
  20. 3
  21. 400
  22. 900
  23. 60
  24. 400
  25. 6
  26. 150
  27. 2900
  28. 220
  29. 370
  30. 480
  31. 400
  32. 3240
  33. 30
  34. 100
  35. 130
  36. 100
  37. 240
  38. 6
  39. 3
  40. 9

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