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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 518 · 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.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
  2. 2.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
  3. 3.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A force of 50 N did 350 J of work. How many metres did the object move?
  5. 5.🏋️ A force of 380 N did 1900 J of work. How many metres did the object move?
  6. 6.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) less effort (d) more effort
  7. 7.🏋️ A force of 100 N pushes a cart 8 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A force of 40 N did 80 J of work. How many metres did the object move?
  9. 9.🏋️ Pushing a crate 9 m took 1260 J of work. What force was used, in newtons?
  10. 10.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A force of 390 N did 3900 J of work. How many metres did the object move?
  12. 12.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
  13. 13.🏋️ Pushing a crate 8 m took 3520 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 9 m took 900 J of work. What force was used, in newtons?
  15. 15.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
  16. 16.🏋️ A 14 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 460 N did 920 J of work. How many metres did the object move?
  18. 18.🏋️ Pushing a crate 8 m took 240 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 120 N pushes a cart 7 m along the floor. How much work is done, in joules?
  20. 20.🏋️ Pushing a crate 7 m took 1680 J of work. What force was used, in newtons?
  21. 21.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 220 N pushes a cart 10 m along the floor. How much work is done, in joules?
  23. 23.🏋️ Pushing a crate 1 m took 490 J of work. What force was used, in newtons?
  24. 24.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ Pushing a crate 1 m took 460 J of work. What force was used, in newtons?
  26. 26.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ Pushing a crate 9 m took 3690 J of work. What force was used, in newtons?
  29. 29.🏋️ Pushing a crate 1 m took 420 J of work. What force was used, in newtons?
  30. 30.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A 2 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.🏋️ Pushing a crate 7 m took 1260 J of work. What force was used, in newtons?
  33. 33.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 120 N did 240 J of work. How many metres did the object move?
  36. 36.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A force of 330 N pushes a cart 9 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. joule (J)
  2. through a distance
  3. 400
  4. 7
  5. 5
  6. less effort
  7. 800
  8. 2
  9. 140
  10. 350
  11. 10
  12. load ÷ effort
  13. 440
  14. 100
  15. no, work stays the same
  16. 420
  17. 2
  18. 30
  19. 840
  20. 240
  21. 6
  22. 2200
  23. 490
  24. 6
  25. 460
  26. 200
  27. 650
  28. 410
  29. 420
  30. 200
  31. 80
  32. 180
  33. 140
  34. 6
  35. 2
  36. 150
  37. 700
  38. 2970
  39. 600
  40. 250

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