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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 862 · 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.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
  2. 2.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ Pushing a crate 10 m took 500 J of work. What force was used, in newtons?
  4. 4.🏋️ A force of 220 N did 440 J of work. How many metres did the object move?
  5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  6. 6.🏋️ Pushing a crate 1 m took 80 J of work. What force was used, in newtons?
  7. 7.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  8. 8.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 470 N pushes a cart 8 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A force of 410 N pushes a cart 2 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A force of 390 N pushes a cart 6 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A force of 470 N did 2350 J of work. How many metres did the object move?
  16. 16.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ Pushing a crate 7 m took 2660 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 130 N pushes a cart 10 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 10 N did 90 J of work. How many metres did the object move?
  20. 20.🏋️ Pushing a crate 3 m took 420 J of work. What force was used, in newtons?
  21. 21.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
  24. 24.🏋️ Pushing a crate 1 m took 270 J of work. What force was used, in newtons?
  25. 25.🏋️ 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?
  26. 26.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 330 N pushes a cart 6 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A force of 180 N pushes a cart 2 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 310 N did 310 J of work. How many metres did the object move?
  30. 30.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ 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?
  32. 32.🏋️ A force of 460 N pushes a cart 2 m along the floor. How much work is done, in joules?
  33. 33.🏋️ 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?
  34. 34.🏋️ A force of 60 N pushes a cart 10 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ Pushing a crate 8 m took 1680 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 190 N did 380 J of work. How many metres did the object move?
  38. 38.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  40. 40.🏋️ Pushing a crate 9 m took 2790 J of work. What force was used, in newtons?

Answer key

  1. through a distance
  2. 200
  3. 50
  4. 2
  5. no, work stays the same
  6. 80
  7. less effort
  8. 500
  9. 250
  10. 30
  11. 5
  12. 3760
  13. 820
  14. 2340
  15. 5
  16. 90
  17. 380
  18. 1300
  19. 9
  20. 140
  21. 50
  22. 400
  23. load ÷ effort
  24. 270
  25. 400
  26. 850
  27. 1980
  28. 360
  29. 1
  30. 140
  31. 120
  32. 920
  33. 680
  34. 600
  35. 160
  36. 210
  37. 2
  38. 850
  39. joule (J)
  40. 310

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