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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 49 · 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 4 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 140 N pushes a cart 6 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A force of 320 N did 1280 J of work. How many metres did the object move?
  4. 4.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ Pushing a crate 7 m took 2100 J of work. What force was used, in newtons?
  7. 7.🏋️ A force of 370 N pushes a cart 4 m along the floor. How much work is done, in joules?
  8. 8.🏋️ Pushing a crate 10 m took 400 J of work. What force was used, in newtons?
  9. 9.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 490 N did 490 J of work. How many metres did the object move?
  11. 11.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
  13. 13.🏋️ Pushing a crate 3 m took 720 J of work. What force was used, in newtons?
  14. 14.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
  15. 15.🏋️ Pushing a crate 8 m took 2400 J of work. What force was used, in newtons?
  16. 16.🏋️ Pushing a crate 2 m took 600 J of work. What force was used, in newtons?
  17. 17.🏋️ Pushing a crate 6 m took 2820 J of work. What force was used, in newtons?
  18. 18.🏋️ 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
  19. 19.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
  21. 21.🏋️ A force of 420 N pushes a cart 8 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 260 N pushes a cart 3 m along the floor. How much work is done, in joules?
  23. 23.🏋️ Pushing a crate 2 m took 320 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 80 N pushes a cart 8 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 130 N pushes a cart 2 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 360 N pushes a cart 2 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 190 N pushes a cart 1 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 470 N did 2820 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 280 N pushes a cart 5 m along the floor. How much work is done, in joules?
  32. 32.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
  33. 33.🏋️ A force of 450 N pushes a cart 4 m along the floor. How much work is done, in joules?
  34. 34.🏋️ Pushing a crate 7 m took 2450 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 500 N pushes a cart 7 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) effort ÷ load (d) load ÷ effort
  39. 39.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?

Answer key

  1. 500
  2. 840
  3. 4
  4. 6
  5. 200
  6. 300
  7. 1480
  8. 40
  9. 100
  10. 1
  11. 3
  12. less effort
  13. 240
  14. through a distance
  15. 300
  16. 300
  17. 470
  18. no, work stays the same
  19. 150
  20. 450
  21. 3360
  22. 780
  23. 160
  24. 640
  25. 3
  26. 260
  27. 4
  28. 720
  29. 190
  30. 6
  31. 1400
  32. joule (J)
  33. 1800
  34. 350
  35. 3500
  36. 50
  37. 950
  38. load ÷ effort
  39. 400
  40. 2

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