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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 96 · 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.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
  4. 4.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
  5. 5.🏋️ 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?
  6. 6.🏋️ A force of 290 N did 870 J of work. How many metres did the object move?
  7. 7.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  8. 8.🏋️ A force of 400 N pushes a cart 3 m along the floor. How much work is done, in joules?
  9. 9.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  10. 10.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ Pushing a crate 6 m took 1800 J of work. What force was used, in newtons?
  12. 12.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
  13. 13.🏋️ Pushing a crate 10 m took 2300 J of work. What force was used, in newtons?
  14. 14.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A 5 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.🏋️ An 18 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.🏋️ Pushing a crate 3 m took 990 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 110 N did 440 J of work. How many metres did the object move?
  19. 19.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A force of 60 N did 540 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 210 N pushes a cart 1 m along the floor. How much work is done, in joules?
  22. 22.🏋️ 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?
  23. 23.🏋️ A force of 260 N pushes a cart 3 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 3 m took 570 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 4 m took 560 J of work. What force was used, in newtons?
  26. 26.🏋️ 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?
  27. 27.🏋️ A 19 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ Pushing a crate 5 m took 2500 J of work. What force was used, in newtons?
  29. 29.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A force of 150 N did 1200 J of work. How many metres did the object move?
  32. 32.🏋️ Pushing a crate 6 m took 1980 J of work. What force was used, in newtons?
  33. 33.🏋️ 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?
  34. 34.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ Pushing a crate 7 m took 140 J of work. What force was used, in newtons?
  36. 36.🏋️ Pushing a crate 4 m took 880 J of work. What force was used, in newtons?
  37. 37.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A force of 350 N pushes a cart 9 m along the floor. How much work is done, in joules?
  40. 40.🏋️ Pushing a crate 1 m took 50 J of work. What force was used, in newtons?

Answer key

  1. 140
  2. 3
  3. no, work stays the same
  4. load ÷ effort
  5. 300
  6. 3
  7. joule (J)
  8. 1200
  9. through a distance
  10. 6
  11. 300
  12. less effort
  13. 230
  14. 400
  15. 150
  16. 900
  17. 330
  18. 4
  19. 320
  20. 9
  21. 210
  22. 700
  23. 780
  24. 190
  25. 140
  26. 100
  27. 950
  28. 500
  29. 200
  30. 3
  31. 8
  32. 330
  33. 400
  34. 2
  35. 20
  36. 220
  37. 400
  38. 200
  39. 3150
  40. 50

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