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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 108 · 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.🏋️ 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?
  2. 2.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
  4. 4.🏋️ A force of 150 N pushes a cart 7 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A force of 380 N pushes a cart 7 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  8. 8.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
  9. 9.🏋️ A force of 240 N did 1680 J of work. How many metres did the object move?
  10. 10.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  11. 11.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 130 N did 650 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 4 m took 320 J of work. What force was used, in newtons?
  14. 14.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 110 N did 550 J of work. How many metres did the object move?
  16. 16.🏋️ A force of 70 N pushes a cart 8 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 4 m took 200 J of work. What force was used, in newtons?
  18. 18.🏋️ A 14 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.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A force of 120 N did 1200 J of work. How many metres did the object move?
  21. 21.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  22. 22.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ Pushing a crate 3 m took 720 J of work. What force was used, in newtons?
  24. 24.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ Pushing a crate 2 m took 220 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 110 N did 440 J of work. How many metres did the object move?
  27. 27.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A force of 340 N pushes a cart 1 m along the floor. How much work is done, in joules?
  30. 30.🏋️ An 8 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 230 N pushes a cart 4 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ Pushing a crate 5 m took 700 J of work. What force was used, in newtons?
  38. 38.🏋️ Pushing a crate 5 m took 1700 J of work. What force was used, in newtons?
  39. 39.🏋️ Pushing a crate 1 m took 250 J of work. What force was used, in newtons?
  40. 40.🏋️ Pushing a crate 4 m took 1120 J of work. What force was used, in newtons?

Answer key

  1. 90
  2. 5
  3. less effort
  4. 1050
  5. 4
  6. 2660
  7. through a distance
  8. joule (J)
  9. 7
  10. load ÷ effort
  11. 950
  12. 5
  13. 80
  14. 650
  15. 5
  16. 560
  17. 50
  18. 560
  19. 900
  20. 10
  21. no, work stays the same
  22. 500
  23. 240
  24. 720
  25. 110
  26. 4
  27. 40
  28. 100
  29. 340
  30. 320
  31. 300
  32. 3
  33. 3
  34. 920
  35. 5
  36. 5
  37. 140
  38. 340
  39. 250
  40. 280

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