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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 426 · 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 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) no, work stays the same (d) only on Mondays
  3. 3.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A 16 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A force of 440 N did 3960 J of work. How many metres did the object move?
  8. 8.🏋️ Pushing a crate 2 m took 620 J of work. What force was used, in newtons?
  9. 9.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 240 N did 2160 J of work. How many metres did the object move?
  11. 11.🏋️ Pushing a crate 2 m took 320 J of work. What force was used, in newtons?
  12. 12.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  13. 13.🏋️ A force of 90 N pushes a cart 6 m along the floor. How much work is done, in joules?
  14. 14.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
  15. 15.🏋️ A force of 290 N pushes a cart 9 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A 13 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ Pushing a crate 8 m took 3440 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 450 N pushes a cart 4 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 90 N did 720 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 230 N pushes a cart 7 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A force of 390 N pushes a cart 5 m along the floor. How much work is done, in joules?
  25. 25.🏋️ Pushing a crate 7 m took 1680 J of work. What force was used, in newtons?
  26. 26.🏋️ Pushing a crate 8 m took 1760 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 330 N did 1980 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 120 N pushes a cart 8 m along the floor. How much work is done, in joules?
  29. 29.🏋️ Pushing a crate 7 m took 700 J of work. What force was used, in newtons?
  30. 30.🏋️ A force of 490 N did 490 J of work. How many metres did the object move?
  31. 31.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A force of 180 N pushes a cart 7 m along the floor. How much work is done, in joules?
  33. 33.🏋️ Pushing a crate 3 m took 1110 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 340 N did 680 J of work. How many metres did the object move?
  35. 35.🏋️ 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)
  36. 36.🏋️ A force of 60 N pushes a cart 7 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ 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)
  39. 39.🏋️ A force of 230 N pushes a cart 5 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort

Answer key

  1. 3
  2. no, work stays the same
  3. 100
  4. 3
  5. 5
  6. 160
  7. 9
  8. 310
  9. 640
  10. 9
  11. 160
  12. through a distance
  13. 540
  14. load ÷ effort
  15. 2610
  16. 650
  17. 430
  18. 1800
  19. 8
  20. 1610
  21. 600
  22. 900
  23. 5
  24. 1950
  25. 240
  26. 220
  27. 6
  28. 960
  29. 100
  30. 1
  31. 400
  32. 1260
  33. 370
  34. 2
  35. 300
  36. 420
  37. 4
  38. 150
  39. 1150
  40. less effort

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