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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 83 · 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 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  3. 3.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
  5. 5.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A force of 50 N pushes a cart 1 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A 17 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.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 280 N pushes a cart 6 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A force of 380 N did 380 J of work. How many metres did the object move?
  11. 11.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  14. 14.🏋️ A force of 110 N did 660 J of work. How many metres did the object move?
  15. 15.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ Pushing a crate 10 m took 1400 J of work. What force was used, in newtons?
  18. 18.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ Pushing a crate 10 m took 900 J of work. What force was used, in newtons?
  21. 21.🏋️ A force of 220 N pushes a cart 4 m along the floor. How much work is done, in joules?
  22. 22.🏋️ Pushing a crate 5 m took 1250 J of work. What force was used, in newtons?
  23. 23.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A force of 250 N pushes a cart 8 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 70 N did 700 J of work. How many metres did the object move?
  26. 26.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 450 N pushes a cart 10 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 1 m took 380 J of work. What force was used, in newtons?
  29. 29.🏋️ 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)
  30. 30.🏋️ Pushing a crate 9 m took 4050 J of work. What force was used, in newtons?
  31. 31.🏋️ Pushing a crate 6 m took 1500 J of work. What force was used, in newtons?
  32. 32.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
  34. 34.🏋️ 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?
  35. 35.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ An 8 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A force of 470 N did 470 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 360 N did 3600 J of work. How many metres did the object move?
  39. 39.🏋️ A force of 160 N did 1440 J of work. How many metres did the object move?
  40. 40.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 3
  2. no, work stays the same
  3. 5
  4. through a distance
  5. 2
  6. 50
  7. 850
  8. 5
  9. 1680
  10. 1
  11. 2
  12. 700
  13. joule (J)
  14. 6
  15. 3
  16. 3
  17. 140
  18. 6
  19. 1000
  20. 90
  21. 880
  22. 250
  23. 250
  24. 2000
  25. 10
  26. 150
  27. 4500
  28. 380
  29. 50
  30. 450
  31. 250
  32. 500
  33. load ÷ effort
  34. 100
  35. 5
  36. 320
  37. 1
  38. 10
  39. 9
  40. 560

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