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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 148 · 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.

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  1. 1.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  3. 3.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
  4. 4.🏋️ A force of 300 N pushes a cart 3 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A force of 100 N pushes a cart 4 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ Pushing a crate 3 m took 390 J of work. What force was used, in newtons?
  8. 8.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A force of 180 N pushes a cart 10 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 110 N did 660 J of work. How many metres did the object move?
  13. 13.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
  14. 14.🏋️ A force of 350 N did 3150 J of work. How many metres did the object move?
  15. 15.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  16. 16.🏋️ 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?
  17. 17.🏋️ A force of 130 N did 260 J of work. How many metres did the object move?
  18. 18.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A 17 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 smooth ramp is 8 m long and rises 2 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ Pushing a crate 3 m took 1410 J of work. What force was used, in newtons?
  27. 27.🏋️ Pushing a crate 3 m took 1080 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 100 N did 300 J of work. How many metres did the object move?
  29. 29.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ Pushing a crate 3 m took 240 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 80 N pushes a cart 5 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 240 N pushes a cart 4 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 110 N did 770 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 170 N pushes a cart 3 m along the floor. How much work is done, in joules?
  36. 36.🏋️ Pushing a crate 8 m took 1200 J of work. What force was used, in newtons?
  37. 37.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ Pushing a crate 10 m took 3300 J of work. What force was used, in newtons?
  39. 39.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 6
  2. joule (J)
  3. through a distance
  4. 900
  5. 400
  6. 3
  7. 130
  8. 1000
  9. 80
  10. 5
  11. 1800
  12. 6
  13. no, work stays the same
  14. 9
  15. load ÷ effort
  16. 60
  17. 2
  18. 200
  19. 3
  20. 3
  21. 5
  22. 800
  23. 170
  24. 650
  25. 440
  26. 470
  27. 360
  28. 3
  29. 6
  30. 80
  31. 400
  32. 960
  33. 5
  34. 7
  35. 510
  36. 150
  37. 240
  38. 330
  39. 3
  40. 150

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