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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 913 · 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) watt hour (b) newton (N) (c) metre (m) (d) joule (J)
  2. 2.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
  3. 3.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A force of 180 N pushes a cart 10 m along the floor. How much work is done, in joules?
  5. 5.🏋️ 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?
  6. 6.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
  7. 7.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A force of 170 N pushes a cart 4 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
  11. 11.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ Pushing a crate 8 m took 80 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 10 N pushes a cart 9 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
  16. 16.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A 10 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ A force of 130 N pushes a cart 9 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ 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?
  22. 22.🏋️ A force of 380 N pushes a cart 2 m along the floor. How much work is done, in joules?
  23. 23.🏋️ Pushing a crate 5 m took 1450 J of work. What force was used, in newtons?
  24. 24.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ 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?
  26. 26.🏋️ Pushing a crate 7 m took 630 J of work. What force was used, in newtons?
  27. 27.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ Pushing a crate 1 m took 350 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 100 N pushes a cart 9 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 100 N pushes a cart 5 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A force of 20 N pushes a cart 5 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ Pushing a crate 6 m took 300 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 130 N pushes a cart 1 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A machine lifts a load of 200 N when you push with 50 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ 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?
  38. 38.🏋️ Pushing a crate 9 m took 630 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 70 N pushes a cart 1 m along the floor. How much work is done, in joules?
  40. 40.🏋️ Pushing a crate 10 m took 700 J of work. What force was used, in newtons?

Answer key

  1. joule (J)
  2. through a distance
  3. 4
  4. 1800
  5. 140
  6. no, work stays the same
  7. 800
  8. 680
  9. 3
  10. load ÷ effort
  11. 80
  12. 160
  13. 10
  14. 90
  15. less effort
  16. 300
  17. 200
  18. 1170
  19. 5
  20. 1000
  21. 390
  22. 760
  23. 290
  24. 4
  25. 80
  26. 90
  27. 800
  28. 350
  29. 900
  30. 500
  31. 100
  32. 600
  33. 50
  34. 130
  35. 4
  36. 2
  37. 600
  38. 70
  39. 70
  40. 70

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