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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 337 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  2. 2.🏋️ Pushing a crate 10 m took 1700 J of work. What force was used, in newtons?
  3. 3.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ Pushing a crate 2 m took 180 J of work. What force was used, in newtons?
  7. 7.🏋️ Pushing a crate 5 m took 1050 J of work. What force was used, in newtons?
  8. 8.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 450 N did 2700 J of work. How many metres did the object move?
  10. 10.🏋️ Pushing a crate 3 m took 750 J of work. What force was used, in newtons?
  11. 11.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ A force of 150 N did 1350 J of work. How many metres did the object move?
  13. 13.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A force of 40 N pushes a cart 4 m along the floor. How much work is done, in joules?
  16. 16.🏋️ 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?
  17. 17.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
  19. 19.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A force of 20 N pushes a cart 1 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A force of 220 N did 1320 J of work. How many metres did the object move?
  22. 22.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ Pushing a crate 5 m took 950 J of work. What force was used, in newtons?
  24. 24.🏋️ A 19 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ 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)
  26. 26.🏋️ A 1 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  28. 28.🏋️ A force of 240 N did 240 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 380 N pushes a cart 2 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 420 N pushes a cart 10 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A force of 270 N did 1350 J of work. How many metres did the object move?
  32. 32.🏋️ Pushing a crate 4 m took 840 J of work. What force was used, in newtons?
  33. 33.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ 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)
  35. 35.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ Pushing a crate 10 m took 2200 J of work. What force was used, in newtons?
  37. 37.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
  38. 38.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ Pushing a crate 1 m took 400 J of work. What force was used, in newtons?
  40. 40.🏋️ Pushing a crate 7 m took 2870 J of work. What force was used, in newtons?

Answer key

  1. through a distance
  2. 170
  3. 3
  4. 3
  5. 440
  6. 90
  7. 210
  8. 6
  9. 6
  10. 250
  11. 400
  12. 9
  13. 250
  14. 760
  15. 160
  16. 320
  17. 70
  18. no, work stays the same
  19. 5
  20. 20
  21. 6
  22. 400
  23. 190
  24. 950
  25. 250
  26. 40
  27. load ÷ effort
  28. 1
  29. 760
  30. 4200
  31. 5
  32. 210
  33. 3
  34. 250
  35. 190
  36. 220
  37. less effort
  38. 200
  39. 400
  40. 410

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