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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 274 · 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 3 m long and rises 1 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  3. 3.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  4. 4.🏋️ Pushing a crate 3 m took 570 J of work. What force was used, in newtons?
  5. 5.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
  6. 6.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
  7. 7.🏋️ A machine lifts a load of 600 N when you push with 200 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ Pushing a crate 3 m took 510 J of work. What force was used, in newtons?
  9. 9.🏋️ A force of 300 N did 1200 J of work. How many metres did the object move?
  10. 10.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A force of 50 N pushes a cart 5 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 170 N pushes a cart 3 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A force of 190 N pushes a cart 2 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ Pushing a crate 5 m took 1350 J of work. What force was used, in newtons?
  17. 17.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
  18. 18.🏋️ Pushing a crate 7 m took 2730 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 400 N did 4000 J of work. How many metres did the object move?
  20. 20.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A force of 350 N did 3150 J of work. How many metres did the object move?
  22. 22.🏋️ A force of 360 N did 720 J of work. How many metres did the object move?
  23. 23.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 500 N pushes a cart 5 m along the floor. How much work is done, in joules?
  27. 27.🏋️ 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?
  28. 28.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ Pushing a crate 8 m took 80 J of work. What force was used, in newtons?
  30. 30.🏋️ A machine lifts a load of 600 N when you push with 150 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A force of 450 N did 900 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 450 N pushes a cart 10 m along the floor. How much work is done, in joules?
  35. 35.🏋️ Pushing a crate 7 m took 2870 J of work. What force was used, in newtons?
  36. 36.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A force of 360 N pushes a cart 9 m along the floor. How much work is done, in joules?
  40. 40.🏋️ Pushing a crate 10 m took 4600 J of work. What force was used, in newtons?

Answer key

  1. 900
  2. through a distance
  3. load ÷ effort
  4. 190
  5. joule (J)
  6. less effort
  7. 3
  8. 170
  9. 4
  10. 150
  11. 250
  12. 510
  13. 950
  14. 380
  15. 6
  16. 270
  17. no, work stays the same
  18. 390
  19. 10
  20. 2
  21. 9
  22. 2
  23. 950
  24. 950
  25. 6
  26. 2500
  27. 390
  28. 300
  29. 10
  30. 4
  31. 6
  32. 50
  33. 2
  34. 4500
  35. 410
  36. 350
  37. 4
  38. 5
  39. 3240
  40. 460

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