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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 69 · 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.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  2. 2.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
  3. 3.🏋️ A force of 150 N pushes a cart 9 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A force of 80 N pushes a cart 7 m along the floor. How much work is done, in joules?
  5. 5.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  6. 6.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ Pushing a crate 3 m took 1200 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 410 N pushes a cart 10 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 350 N did 3150 J of work. How many metres did the object move?
  11. 11.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 80 N pushes a cart 8 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A force of 20 N did 20 J of work. How many metres did the object move?
  14. 14.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A force of 10 N pushes a cart 8 m along the floor. How much work is done, in joules?
  16. 16.🏋️ 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)
  17. 17.🏋️ A machine lifts a load of 570 N when you push with 190 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Pushing a crate 3 m took 960 J of work. What force was used, in newtons?
  19. 19.🏋️ Pushing a crate 7 m took 1260 J of work. What force was used, in newtons?
  20. 20.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Pushing a crate 4 m took 800 J of work. What force was used, in newtons?
  22. 22.🏋️ A 7 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ Pushing a crate 10 m took 3400 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 140 N pushes a cart 2 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  27. 27.🏋️ 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?
  28. 28.🏋️ Pushing a crate 5 m took 1550 J of work. What force was used, in newtons?
  29. 29.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) less effort (d) more effort
  30. 30.🏋️ Pushing a crate 8 m took 1040 J of work. What force was used, in newtons?
  31. 31.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ Pushing a crate 5 m took 450 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 240 N did 1680 J of work. How many metres did the object move?
  34. 34.🏋️ 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)
  35. 35.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ Pushing a crate 9 m took 4320 J of work. What force was used, in newtons?
  37. 37.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ Pushing a crate 2 m took 100 J of work. What force was used, in newtons?
  39. 39.🏋️ Pushing a crate 7 m took 1610 J of work. What force was used, in newtons?
  40. 40.🏋️ Pushing a crate 4 m took 200 J of work. What force was used, in newtons?

Answer key

  1. load ÷ effort
  2. no, work stays the same
  3. 1350
  4. 560
  5. through a distance
  6. 750
  7. 400
  8. 4100
  9. 3
  10. 9
  11. 650
  12. 640
  13. 1
  14. 4
  15. 80
  16. 150
  17. 3
  18. 320
  19. 180
  20. 2
  21. 200
  22. 280
  23. 340
  24. 280
  25. 3
  26. joule (J)
  27. 120
  28. 310
  29. less effort
  30. 130
  31. 5
  32. 90
  33. 7
  34. 350
  35. 190
  36. 480
  37. 450
  38. 50
  39. 230
  40. 50

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