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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 811 · 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) no, work stays the same (d) yes, by half
  2. 2.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ 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?
  4. 4.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ Pushing a crate 4 m took 920 J of work. What force was used, in newtons?
  7. 7.🏋️ Pushing a crate 9 m took 900 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 440 N did 3520 J of work. How many metres did the object move?
  9. 9.🏋️ Pushing a crate 6 m took 1500 J of work. What force was used, in newtons?
  10. 10.🏋️ Pushing a crate 5 m took 150 J of work. What force was used, in newtons?
  11. 11.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A force of 250 N pushes a cart 8 m along the floor. How much work is done, in joules?
  14. 14.🏋️ Pushing a crate 1 m took 480 J of work. What force was used, in newtons?
  15. 15.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  17. 17.🏋️ A force of 160 N did 1440 J of work. How many metres did the object move?
  18. 18.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  20. 20.🏋️ A force of 450 N pushes a cart 4 m along the floor. How much work is done, in joules?
  21. 21.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
  22. 22.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A force of 390 N pushes a cart 7 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 9 m took 2520 J of work. What force was used, in newtons?
  25. 25.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 470 N did 470 J of work. How many metres did the object move?
  27. 27.🏋️ 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?
  28. 28.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A 13 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ Pushing a crate 8 m took 3840 J of work. What force was used, in newtons?
  31. 31.🏋️ 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?
  32. 32.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ Pushing a crate 9 m took 720 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 480 N pushes a cart 7 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 410 N did 820 J of work. How many metres did the object move?
  36. 36.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A force of 50 N pushes a cart 10 m along the floor. How much work is done, in joules?
  38. 38.🏋️ 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?
  39. 39.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 260 N pushes a cart 4 m along the floor. How much work is done, in joules?

Answer key

  1. no, work stays the same
  2. 4
  3. 640
  4. 350
  5. 700
  6. 230
  7. 100
  8. 8
  9. 250
  10. 30
  11. 3
  12. 350
  13. 2000
  14. 480
  15. 30
  16. through a distance
  17. 9
  18. 480
  19. joule (J)
  20. 1800
  21. load ÷ effort
  22. 100
  23. 2730
  24. 280
  25. 4
  26. 1
  27. 600
  28. 2
  29. 390
  30. 480
  31. 90
  32. 50
  33. 80
  34. 3360
  35. 2
  36. 130
  37. 500
  38. 120
  39. 5
  40. 1040

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