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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 835 · 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.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  3. 3.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
  4. 4.🏋️ Pushing a crate 3 m took 840 J of work. What force was used, in newtons?
  5. 5.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A force of 120 N did 240 J of work. How many metres did the object move?
  9. 9.🏋️ A force of 210 N did 420 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 410 N did 2460 J of work. How many metres did the object move?
  11. 11.🏋️ Pushing a crate 2 m took 880 J of work. What force was used, in newtons?
  12. 12.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A force of 150 N did 600 J of work. How many metres did the object move?
  14. 14.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 370 N pushes a cart 4 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 450 N pushes a cart 6 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A machine lifts a load of 540 N when you push with 90 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A force of 10 N did 20 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 50 N pushes a cart 5 m along the floor. How much work is done, in joules?
  20. 20.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
  21. 21.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ Pushing a crate 3 m took 480 J of work. What force was used, in newtons?
  23. 23.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A force of 360 N pushes a cart 3 m along the floor. How much work is done, in joules?
  25. 25.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  26. 26.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ Pushing a crate 10 m took 3400 J of work. What force was used, in newtons?
  30. 30.🏋️ Pushing a crate 6 m took 360 J of work. What force was used, in newtons?
  31. 31.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A force of 440 N did 880 J of work. How many metres did the object move?
  35. 35.🏋️ Pushing a crate 3 m took 240 J of work. What force was used, in newtons?
  36. 36.🏋️ A force of 300 N did 900 J of work. How many metres did the object move?
  37. 37.🏋️ A force of 330 N pushes a cart 7 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 70 N pushes a cart 4 m along the floor. How much work is done, in joules?
  39. 39.🏋️ 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?
  40. 40.🏋️ Pushing a crate 6 m took 720 J of work. What force was used, in newtons?

Answer key

  1. 120
  2. less effort
  3. through a distance
  4. 280
  5. 2
  6. 1000
  7. 20
  8. 2
  9. 2
  10. 6
  11. 440
  12. 2
  13. 4
  14. 550
  15. 1480
  16. 2700
  17. 6
  18. 2
  19. 250
  20. load ÷ effort
  21. 200
  22. 160
  23. 800
  24. 1080
  25. no, work stays the same
  26. 40
  27. 550
  28. 750
  29. 340
  30. 60
  31. 3
  32. 350
  33. 450
  34. 2
  35. 80
  36. 3
  37. 2310
  38. 280
  39. 150
  40. 120

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