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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 252 · 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.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
  2. 2.🏋️ Pushing a crate 6 m took 240 J of work. What force was used, in newtons?
  3. 3.🏋️ A force of 70 N did 630 J of work. How many metres did the object move?
  4. 4.🏋️ A force of 440 N did 3520 J of work. How many metres did the object move?
  5. 5.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
  6. 6.🏋️ Pushing a crate 6 m took 780 J of work. What force was used, in newtons?
  7. 7.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) effort ÷ load (d) load ÷ effort
  8. 8.🏋️ 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
  9. 9.🏋️ A 7 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 machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ Pushing a crate 1 m took 470 J of work. What force was used, in newtons?
  12. 12.🏋️ A force of 170 N pushes a cart 8 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Pushing a crate 6 m took 300 J of work. What force was used, in newtons?
  14. 14.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ 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?
  16. 16.🏋️ A force of 20 N did 200 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 350 N pushes a cart 7 m along the floor. How much work is done, in joules?
  18. 18.🏋️ 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)
  19. 19.🏋️ A force of 200 N did 1000 J of work. How many metres did the object move?
  20. 20.🏋️ Pushing a crate 9 m took 2970 J of work. What force was used, in newtons?
  21. 21.🏋️ Pushing a crate 7 m took 2660 J of work. What force was used, in newtons?
  22. 22.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Pushing a crate 3 m took 30 J of work. What force was used, in newtons?
  28. 28.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 110 N did 660 J of work. How many metres did the object move?
  30. 30.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  31. 31.🏋️ A force of 450 N pushes a cart 6 m along the floor. How much work is done, in joules?
  32. 32.🏋️ 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?
  33. 33.🏋️ A force of 70 N pushes a cart 5 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 460 N pushes a cart 9 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 420 N pushes a cart 3 m along the floor. How much work is done, in joules?
  36. 36.🏋️ 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?
  37. 37.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A force of 30 N pushes a cart 8 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. through a distance
  2. 40
  3. 9
  4. 8
  5. joule (J)
  6. 130
  7. load ÷ effort
  8. no, work stays the same
  9. 280
  10. 4
  11. 470
  12. 1360
  13. 50
  14. 120
  15. 140
  16. 10
  17. 2450
  18. 900
  19. 5
  20. 330
  21. 380
  22. 330
  23. 20
  24. 190
  25. 4
  26. 6
  27. 10
  28. 3
  29. 6
  30. less effort
  31. 2700
  32. 60
  33. 350
  34. 4140
  35. 1260
  36. 400
  37. 4
  38. 240
  39. 600
  40. 640

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