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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 56 · 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 force of 180 N did 720 J of work. How many metres did the object move?
  2. 2.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  3. 3.🏋️ A force of 360 N did 720 J of work. How many metres did the object move?
  4. 4.🏋️ Pushing a crate 9 m took 3150 J of work. What force was used, in newtons?
  5. 5.🏋️ Pushing a crate 8 m took 2960 J of work. What force was used, in newtons?
  6. 6.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  7. 7.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A force of 50 N pushes a cart 7 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A force of 50 N pushes a cart 4 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A force of 390 N did 780 J of work. How many metres did the object move?
  11. 11.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  12. 12.🏋️ Pushing a crate 4 m took 1560 J of work. What force was used, in newtons?
  13. 13.🏋️ 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?
  14. 14.🏋️ Pushing a crate 1 m took 70 J of work. What force was used, in newtons?
  15. 15.🏋️ A 12 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.🏋️ Pushing a crate 3 m took 1260 J of work. What force was used, in newtons?
  17. 17.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Pushing a crate 3 m took 210 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 390 N did 390 J of work. How many metres did the object move?
  20. 20.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
  21. 21.🏋️ A force of 350 N did 2450 J of work. How many metres did the object move?
  22. 22.🏋️ Pushing a crate 5 m took 2100 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 70 N pushes a cart 6 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
  25. 25.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ 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?
  28. 28.🏋️ Pushing a crate 2 m took 160 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 90 N pushes a cart 6 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 190 N did 1330 J of work. How many metres did the object move?
  31. 31.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ Pushing a crate 1 m took 150 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 30 N pushes a cart 1 m along the floor. How much work is done, in joules?
  35. 35.🏋️ Pushing a crate 8 m took 640 J of work. What force was used, in newtons?
  36. 36.🏋️ A force of 280 N did 280 J of work. How many metres did the object move?
  37. 37.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 340 N pushes a cart 5 m along the floor. How much work is done, in joules?

Answer key

  1. 4
  2. less effort
  3. 2
  4. 350
  5. 370
  6. joule (J)
  7. 4
  8. 350
  9. 200
  10. 2
  11. no, work stays the same
  12. 390
  13. 140
  14. 70
  15. 600
  16. 420
  17. 6
  18. 70
  19. 1
  20. through a distance
  21. 7
  22. 420
  23. 420
  24. load ÷ effort
  25. 550
  26. 6
  27. 200
  28. 80
  29. 540
  30. 7
  31. 5
  32. 400
  33. 150
  34. 30
  35. 80
  36. 1
  37. 400
  38. 3
  39. 5
  40. 1700

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