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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 864 · 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.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
  2. 2.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
  3. 3.🏋️ A force of 360 N did 1440 J of work. How many metres did the object move?
  4. 4.🏋️ A force of 100 N did 400 J of work. How many metres did the object move?
  5. 5.🏋️ Pushing a crate 10 m took 1100 J of work. What force was used, in newtons?
  6. 6.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
  7. 7.🏋️ A force of 150 N did 900 J of work. How many metres did the object move?
  8. 8.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
  9. 9.🏋️ A force of 260 N did 1560 J of work. How many metres did the object move?
  10. 10.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  12. 12.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ Pushing a crate 2 m took 140 J of work. What force was used, in newtons?
  14. 14.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 120 N did 840 J of work. How many metres did the object move?
  16. 16.🏋️ A force of 310 N did 2170 J of work. How many metres did the object move?
  17. 17.🏋️ Pushing a crate 1 m took 80 J of work. What force was used, in newtons?
  18. 18.🏋️ Pushing a crate 4 m took 840 J of work. What force was used, in newtons?
  19. 19.🏋️ Pushing a crate 1 m took 10 J of work. What force was used, in newtons?
  20. 20.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 240 N did 720 J of work. How many metres did the object move?
  23. 23.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ Pushing a crate 8 m took 1440 J of work. What force was used, in newtons?
  27. 27.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ Pushing a crate 10 m took 400 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 300 N did 1200 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 490 N pushes a cart 1 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A force of 60 N did 180 J of work. How many metres did the object move?
  34. 34.🏋️ 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?
  35. 35.🏋️ Pushing a crate 8 m took 3120 J of work. What force was used, in newtons?
  36. 36.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  40. 40.🏋️ Pushing a crate 3 m took 480 J of work. What force was used, in newtons?

Answer key

  1. no, work stays the same
  2. load ÷ effort
  3. 4
  4. 4
  5. 110
  6. through a distance
  7. 6
  8. 2
  9. 6
  10. 120
  11. less effort
  12. 6
  13. 70
  14. 100
  15. 7
  16. 7
  17. 80
  18. 210
  19. 10
  20. 600
  21. 2
  22. 3
  23. 6
  24. 4
  25. 300
  26. 180
  27. 650
  28. 40
  29. 4
  30. 490
  31. 270
  32. 900
  33. 3
  34. 220
  35. 390
  36. 3
  37. 3
  38. 5
  39. joule (J)
  40. 160

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