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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 414 · 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 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
  3. 3.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
  5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  6. 6.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ Pushing a crate 6 m took 780 J of work. What force was used, in newtons?
  9. 9.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ Pushing a crate 3 m took 1110 J of work. What force was used, in newtons?
  11. 11.🏋️ 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?
  12. 12.🏋️ Pushing a crate 3 m took 690 J of work. What force was used, in newtons?
  13. 13.🏋️ Pushing a crate 6 m took 900 J of work. What force was used, in newtons?
  14. 14.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A force of 50 N pushes a cart 3 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 30 N pushes a cart 2 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Pushing a crate 7 m took 560 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 470 N pushes a cart 6 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 260 N pushes a cart 1 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A force of 300 N pushes a cart 1 m along the floor. How much work is done, in joules?
  25. 25.🏋️ Pushing a crate 8 m took 720 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 360 N did 2160 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 250 N pushes a cart 4 m along the floor. How much work is done, in joules?
  28. 28.🏋️ 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?
  29. 29.🏋️ A force of 40 N did 360 J of work. How many metres did the object move?
  30. 30.🏋️ A 10 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ 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?
  32. 32.🏋️ A force of 10 N did 80 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 310 N did 310 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 140 N pushes a cart 2 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A 20 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.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ Pushing a crate 3 m took 960 J of work. What force was used, in newtons?
  40. 40.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort

Answer key

  1. 3
  2. joule (J)
  3. 750
  4. through a distance
  5. no, work stays the same
  6. 250
  7. 100
  8. 130
  9. 2
  10. 370
  11. 190
  12. 230
  13. 150
  14. 5
  15. 6
  16. 4
  17. 150
  18. 3
  19. 60
  20. 2
  21. 80
  22. 2820
  23. 260
  24. 300
  25. 90
  26. 6
  27. 1000
  28. 80
  29. 9
  30. 300
  31. 800
  32. 8
  33. 1
  34. 280
  35. 240
  36. 900
  37. 600
  38. 60
  39. 320
  40. less effort

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