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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 992 · 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.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
  2. 2.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ Pushing a crate 10 m took 4200 J of work. What force was used, in newtons?
  5. 5.🏋️ A force of 320 N did 2880 J of work. How many metres did the object move?
  6. 6.🏋️ Pushing a crate 5 m took 2400 J of work. What force was used, in newtons?
  7. 7.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
  8. 8.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 120 N did 960 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 240 N did 960 J of work. How many metres did the object move?
  11. 11.🏋️ A force of 60 N did 180 J of work. How many metres did the object move?
  12. 12.🏋️ Pushing a crate 3 m took 180 J of work. What force was used, in newtons?
  13. 13.🏋️ A force of 20 N did 100 J of work. How many metres did the object move?
  14. 14.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 290 N did 870 J of work. How many metres did the object move?
  16. 16.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  17. 17.🏋️ A force of 410 N pushes a cart 7 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 340 N did 1360 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 100 N pushes a cart 7 m along the floor. How much work is done, in joules?
  20. 20.🏋️ Pushing a crate 10 m took 4400 J of work. What force was used, in newtons?
  21. 21.🏋️ A force of 40 N did 280 J of work. How many metres did the object move?
  22. 22.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4250 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
  28. 28.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ Pushing a crate 3 m took 630 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 320 N did 960 J of work. How many metres did the object move?
  32. 32.🏋️ Pushing a crate 9 m took 3600 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 280 N did 1400 J of work. How many metres did the object move?
  34. 34.🏋️ Pushing a crate 2 m took 100 J of work. What force was used, in newtons?
  35. 35.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A force of 80 N pushes a cart 6 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A force of 270 N pushes a cart 1 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ Pushing a crate 10 m took 3500 J of work. What force was used, in newtons?
  40. 40.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. load ÷ effort
  2. 450
  3. 4
  4. 420
  5. 9
  6. 480
  7. joule (J)
  8. 6
  9. 8
  10. 4
  11. 3
  12. 60
  13. 5
  14. 100
  15. 3
  16. through a distance
  17. 2870
  18. 4
  19. 700
  20. 440
  21. 7
  22. 2
  23. 50
  24. 850
  25. 4
  26. 2
  27. no, work stays the same
  28. 6
  29. 450
  30. 210
  31. 3
  32. 400
  33. 5
  34. 50
  35. 540
  36. 480
  37. 270
  38. 450
  39. 350
  40. 650

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