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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 16 · 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 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A force of 140 N pushes a cart 10 m along the floor. How much work is done, in joules?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
  4. 4.🏋️ Pushing a crate 2 m took 20 J of work. What force was used, in newtons?
  5. 5.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
  7. 7.🏋️ A 7 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.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
  9. 9.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ Pushing a crate 8 m took 2240 J of work. What force was used, in newtons?
  13. 13.🏋️ A force of 270 N pushes a cart 4 m along the floor. How much work is done, in joules?
  14. 14.🏋️ Pushing a crate 9 m took 2160 J of work. What force was used, in newtons?
  15. 15.🏋️ A force of 380 N did 2660 J of work. How many metres did the object move?
  16. 16.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
  17. 17.🏋️ Pushing a crate 6 m took 2700 J of work. What force was used, in newtons?
  18. 18.🏋️ Pushing a crate 6 m took 420 J of work. What force was used, in newtons?
  19. 19.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  21. 21.🏋️ A force of 310 N did 2480 J of work. How many metres did the object move?
  22. 22.🏋️ A 10 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ Pushing a crate 9 m took 990 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 1 m took 40 J of work. What force was used, in newtons?
  26. 26.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 40 N did 40 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 460 N did 4600 J of work. How many metres did the object move?
  29. 29.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A force of 20 N pushes a cart 10 m along the floor. How much work is done, in joules?
  31. 31.🏋️ Pushing a crate 5 m took 1950 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 370 N did 740 J of work. How many metres did the object move?
  33. 33.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A force of 380 N did 2280 J of work. How many metres did the object move?
  35. 35.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ Pushing a crate 6 m took 1980 J of work. What force was used, in newtons?
  37. 37.🏋️ A machine lifts a load of 570 N when you push with 190 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ Pushing a crate 5 m took 950 J of work. What force was used, in newtons?
  40. 40.🏋️ A force of 270 N did 1350 J of work. How many metres did the object move?

Answer key

  1. 4
  2. 1400
  3. no, work stays the same
  4. 10
  5. 570
  6. joule (J)
  7. 350
  8. load ÷ effort
  9. 450
  10. 450
  11. 600
  12. 280
  13. 1080
  14. 240
  15. 7
  16. less effort
  17. 450
  18. 70
  19. 3
  20. through a distance
  21. 8
  22. 500
  23. 200
  24. 110
  25. 40
  26. 800
  27. 1
  28. 10
  29. 2
  30. 200
  31. 390
  32. 2
  33. 850
  34. 6
  35. 900
  36. 330
  37. 3
  38. 400
  39. 190
  40. 5

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