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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 281 · 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 smooth ramp is 12 m long and rises 2 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Pushing a crate 3 m took 960 J of work. What force was used, in newtons?
  3. 3.🏋️ A force of 130 N pushes a cart 3 m along the floor. How much work is done, in joules?
  4. 4.🏋️ Pushing a crate 2 m took 240 J of work. What force was used, in newtons?
  5. 5.🏋️ A force of 380 N did 1900 J of work. How many metres did the object move?
  6. 6.🏋️ A force of 270 N pushes a cart 10 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
  8. 8.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
  9. 9.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
  10. 10.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ 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)
  12. 12.🏋️ A force of 20 N did 20 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 6 m took 840 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 6 m took 420 J of work. What force was used, in newtons?
  15. 15.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
  17. 17.🏋️ 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?
  18. 18.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A 10 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ Pushing a crate 8 m took 1200 J of work. What force was used, in newtons?
  22. 22.🏋️ 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?
  23. 23.🏋️ A force of 30 N pushes a cart 4 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ Pushing a crate 9 m took 2790 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 470 N pushes a cart 3 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 180 N did 1440 J of work. How many metres did the object move?
  30. 30.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ Pushing a crate 8 m took 1680 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 3 m took 1200 J of work. What force was used, in newtons?
  33. 33.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  35. 35.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A force of 70 N did 700 J of work. How many metres did the object move?
  37. 37.🏋️ Pushing a crate 10 m took 1800 J of work. What force was used, in newtons?
  38. 38.🏋️ Pushing a crate 6 m took 2280 J of work. What force was used, in newtons?
  39. 39.🏋️ Pushing a crate 8 m took 320 J of work. What force was used, in newtons?
  40. 40.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 1000
  2. 320
  3. 390
  4. 120
  5. 5
  6. 2700
  7. no, work stays the same
  8. less effort
  9. load ÷ effort
  10. 1000
  11. 1000
  12. 1
  13. 140
  14. 70
  15. 250
  16. joule (J)
  17. 90
  18. 4
  19. 120
  20. 300
  21. 150
  22. 360
  23. 120
  24. 6
  25. 2
  26. 800
  27. 310
  28. 1410
  29. 8
  30. 2
  31. 210
  32. 400
  33. 5
  34. through a distance
  35. 50
  36. 10
  37. 180
  38. 380
  39. 40
  40. 250

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