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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 172 · 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) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  2. 2.🏋️ Pushing a crate 3 m took 120 J of work. What force was used, in newtons?
  3. 3.🏋️ A force of 430 N pushes a cart 1 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  5. 5.🏋️ A force of 100 N pushes a cart 6 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A force of 260 N did 780 J of work. How many metres did the object move?
  7. 7.🏋️ A force of 40 N pushes a cart 4 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A force of 200 N pushes a cart 6 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A force of 100 N did 800 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 300 N pushes a cart 3 m along the floor. How much work is done, in joules?
  11. 11.🏋️ Pushing a crate 8 m took 3360 J of work. What force was used, in newtons?
  12. 12.🏋️ Pushing a crate 8 m took 720 J of work. What force was used, in newtons?
  13. 13.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  14. 14.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  15. 15.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  17. 17.🏋️ A force of 30 N did 60 J of work. How many metres did the object move?
  18. 18.🏋️ 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?
  19. 19.🏋️ Pushing a crate 9 m took 810 J of work. What force was used, in newtons?
  20. 20.🏋️ A force of 500 N pushes a cart 1 m along the floor. How much work is done, in joules?
  21. 21.🏋️ Pushing a crate 1 m took 20 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 430 N did 1290 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 390 N pushes a cart 3 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A force of 180 N pushes a cart 5 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 330 N did 1650 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 190 N did 190 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 500 N did 4000 J of work. How many metres did the object move?
  28. 28.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A force of 50 N did 50 J of work. How many metres did the object move?
  30. 30.🏋️ 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?
  31. 31.🏋️ A 17 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A force of 160 N pushes a cart 6 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 140 N did 420 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 40 N did 280 J of work. How many metres did the object move?
  37. 37.🏋️ A force of 310 N did 1550 J of work. How many metres did the object move?
  38. 38.🏋️ Pushing a crate 9 m took 2790 J of work. What force was used, in newtons?
  39. 39.🏋️ Pushing a crate 5 m took 1400 J of work. What force was used, in newtons?
  40. 40.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?

Answer key

  1. no, work stays the same
  2. 40
  3. 430
  4. less effort
  5. 600
  6. 3
  7. 160
  8. 1200
  9. 8
  10. 900
  11. 420
  12. 90
  13. through a distance
  14. load ÷ effort
  15. 4
  16. joule (J)
  17. 2
  18. 700
  19. 90
  20. 500
  21. 20
  22. 3
  23. 1170
  24. 900
  25. 5
  26. 1
  27. 8
  28. 850
  29. 1
  30. 120
  31. 850
  32. 3
  33. 960
  34. 5
  35. 3
  36. 7
  37. 5
  38. 310
  39. 280
  40. 3

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