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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 602 · 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 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ 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)
  4. 4.🏋️ Pushing a crate 8 m took 2400 J of work. What force was used, in newtons?
  5. 5.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A force of 20 N pushes a cart 9 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A 10 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
  15. 15.🏋️ A force of 430 N pushes a cart 1 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 170 N pushes a cart 8 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 9 m took 90 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 440 N pushes a cart 4 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
  24. 24.🏋️ A force of 280 N pushes a cart 3 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 80 N pushes a cart 7 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  27. 27.🏋️ Pushing a crate 4 m took 1560 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 150 N pushes a cart 4 m along the floor. How much work is done, in joules?
  29. 29.🏋️ Pushing a crate 8 m took 720 J of work. What force was used, in newtons?
  30. 30.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
  31. 31.🏋️ A force of 170 N did 510 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 170 N did 1700 J of work. How many metres did the object move?
  33. 33.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) less effort (d) more effort
  34. 34.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ Pushing a crate 9 m took 1980 J of work. What force was used, in newtons?
  39. 39.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A force of 120 N pushes a cart 10 m along the floor. How much work is done, in joules?

Answer key

  1. 4
  2. 300
  3. 950
  4. 300
  5. 2
  6. 4
  7. 180
  8. 200
  9. 130
  10. 40
  11. 250
  12. 360
  13. 800
  14. no, work stays the same
  15. 430
  16. 1360
  17. 10
  18. 1760
  19. 4
  20. 1000
  21. 720
  22. 1000
  23. joule (J)
  24. 840
  25. 560
  26. load ÷ effort
  27. 390
  28. 600
  29. 90
  30. through a distance
  31. 3
  32. 10
  33. less effort
  34. 4
  35. 5
  36. 600
  37. 360
  38. 220
  39. 600
  40. 1200

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