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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 55 · 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 smooth ramp is 12 m long and rises 2 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Pushing a crate 7 m took 3500 J of work. What force was used, in newtons?
  3. 3.🏋️ 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
  4. 4.🏋️ A force of 260 N pushes a cart 3 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
  6. 6.🏋️ Pushing a crate 5 m took 100 J of work. What force was used, in newtons?
  7. 7.🏋️ A force of 100 N did 800 J of work. How many metres did the object move?
  8. 8.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  9. 9.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 220 N pushes a cart 3 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Pushing a crate 4 m took 360 J of work. What force was used, in newtons?
  14. 14.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ Pushing a crate 6 m took 1500 J of work. What force was used, in newtons?
  16. 16.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
  18. 18.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
  20. 20.🏋️ A force of 40 N pushes a cart 8 m along the floor. How much work is done, in joules?
  21. 21.🏋️ 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?
  22. 22.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A force of 90 N pushes a cart 3 m along the floor. How much work is done, in joules?
  25. 25.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) effort ÷ load (d) load ÷ effort
  26. 26.🏋️ Pushing a crate 7 m took 1330 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 320 N did 1920 J of work. How many metres did the object move?
  28. 28.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 190 N did 380 J of work. How many metres did the object move?
  30. 30.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ Pushing a crate 8 m took 640 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 140 N pushes a cart 1 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A force of 160 N pushes a cart 1 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A machine lifts a load of 480 N when you push with 80 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 370 N pushes a cart 2 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A force of 310 N did 2480 J of work. How many metres did the object move?
  37. 37.🏋️ Pushing a crate 8 m took 1280 J of work. What force was used, in newtons?
  38. 38.🏋️ 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?
  39. 39.🏋️ Pushing a crate 10 m took 300 J of work. What force was used, in newtons?
  40. 40.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 900
  2. 500
  3. no, work stays the same
  4. 780
  5. less effort
  6. 20
  7. 8
  8. through a distance
  9. 5
  10. 270
  11. 900
  12. 660
  13. 90
  14. 3
  15. 250
  16. 3
  17. joule (J)
  18. 6
  19. 450
  20. 320
  21. 160
  22. 50
  23. 3
  24. 270
  25. load ÷ effort
  26. 190
  27. 6
  28. 2
  29. 2
  30. 4
  31. 80
  32. 140
  33. 160
  34. 6
  35. 740
  36. 8
  37. 160
  38. 240
  39. 30
  40. 30

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