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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 97 · 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 18 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 30 N pushes a cart 9 m along the floor. How much work is done, in joules?
  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 smooth ramp is 12 m long and rises 3 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A force of 130 N did 130 J of work. How many metres did the object move?
  7. 7.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A force of 10 N did 90 J of work. How many metres did the object move?
  9. 9.🏋️ A force of 190 N did 1330 J of work. How many metres did the object move?
  10. 10.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A force of 40 N did 200 J of work. How many metres did the object move?
  12. 12.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  13. 13.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
  14. 14.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  17. 17.🏋️ Pushing a crate 10 m took 3500 J of work. What force was used, in newtons?
  18. 18.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 90 N pushes a cart 1 m along the floor. How much work is done, in joules?
  20. 20.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A force of 300 N did 2700 J of work. How many metres did the object move?
  22. 22.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A force of 150 N pushes a cart 4 m along the floor. How much work is done, in joules?
  25. 25.🏋️ Pushing a crate 4 m took 1280 J of work. What force was used, in newtons?
  26. 26.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Pushing a crate 9 m took 1440 J of work. What force was used, in newtons?
  28. 28.🏋️ A 17 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ Pushing a crate 5 m took 1450 J of work. What force was used, in newtons?
  30. 30.🏋️ A force of 350 N did 3500 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 10 N pushes a cart 2 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ 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)
  34. 34.🏋️ A force of 90 N pushes a cart 6 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A force of 460 N pushes a cart 6 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A force of 70 N did 350 J of work. How many metres did the object move?
  39. 39.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) less effort (d) the same effort
  40. 40.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?

Answer key

  1. 50
  2. 270
  3. no, work stays the same
  4. 550
  5. 120
  6. 1
  7. 5
  8. 9
  9. 7
  10. 6
  11. 5
  12. load ÷ effort
  13. joule (J)
  14. 6
  15. 4
  16. through a distance
  17. 350
  18. 5
  19. 90
  20. 240
  21. 9
  22. 4
  23. 250
  24. 600
  25. 320
  26. 2
  27. 160
  28. 680
  29. 290
  30. 10
  31. 20
  32. 5
  33. 950
  34. 540
  35. 700
  36. 2760
  37. 800
  38. 5
  39. less effort
  40. 5

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