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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 817 · 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.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
  2. 2.🏋️ A 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
  4. 4.🏋️ Pushing a crate 7 m took 910 J of work. What force was used, in newtons?
  5. 5.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
  6. 6.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A force of 50 N did 100 J of work. How many metres did the object move?
  10. 10.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  11. 11.🏋️ A force of 280 N did 560 J of work. How many metres did the object move?
  12. 12.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A force of 130 N did 390 J of work. How many metres did the object move?
  14. 14.🏋️ Pushing a crate 6 m took 60 J of work. What force was used, in newtons?
  15. 15.🏋️ A force of 340 N pushes a cart 9 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A force of 330 N pushes a cart 1 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 400 N pushes a cart 9 m along the floor. How much work is done, in joules?
  20. 20.🏋️ Pushing a crate 3 m took 120 J of work. What force was used, in newtons?
  21. 21.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  22. 22.🏋️ A force of 320 N did 1920 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 220 N pushes a cart 6 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 6 m took 2520 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 3 m took 750 J of work. What force was used, in newtons?
  26. 26.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 220 N pushes a cart 5 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A force of 320 N did 1600 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 460 N pushes a cart 8 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 180 N did 1440 J of work. How many metres did the object move?
  31. 31.🏋️ 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?
  32. 32.🏋️ A force of 380 N pushes a cart 9 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A force of 50 N did 350 J of work. How many metres did the object move?
  34. 34.🏋️ Pushing a crate 1 m took 330 J of work. What force was used, in newtons?
  35. 35.🏋️ Pushing a crate 5 m took 200 J of work. What force was used, in newtons?
  36. 36.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 140 N did 840 J of work. How many metres did the object move?
  38. 38.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ Pushing a crate 2 m took 240 J of work. What force was used, in newtons?
  40. 40.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. joule (J)
  2. 600
  3. no, work stays the same
  4. 130
  5. through a distance
  6. 50
  7. 5
  8. 90
  9. 2
  10. load ÷ effort
  11. 2
  12. 80
  13. 3
  14. 10
  15. 3060
  16. 100
  17. 330
  18. 3
  19. 3600
  20. 40
  21. less effort
  22. 6
  23. 1320
  24. 420
  25. 250
  26. 950
  27. 1100
  28. 5
  29. 3680
  30. 8
  31. 120
  32. 3420
  33. 7
  34. 330
  35. 40
  36. 6
  37. 6
  38. 2
  39. 120
  40. 400

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