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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 431 · 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) without moving it (b) only upwards (c) very slowly (d) through a distance
  2. 2.🏋️ A force of 500 N pushes a cart 8 m along the floor. How much work is done, in joules?
  3. 3.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
  4. 4.🏋️ A force of 10 N did 70 J of work. How many metres did the object move?
  5. 5.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  7. 7.🏋️ A machine lifts a load of 600 N when you push with 150 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A force of 180 N did 1800 J of work. How many metres did the object move?
  9. 9.🏋️ A force of 150 N did 750 J of work. How many metres did the object move?
  10. 10.🏋️ A 17 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.🏋️ Pushing a crate 5 m took 1100 J of work. What force was used, in newtons?
  12. 12.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ Pushing a crate 8 m took 320 J of work. What force was used, in newtons?
  15. 15.🏋️ A force of 110 N did 990 J of work. How many metres did the object move?
  16. 16.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) the same effort (d) more effort
  17. 17.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Pushing a crate 6 m took 840 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 100 N did 1000 J of work. How many metres did the object move?
  20. 20.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Pushing a crate 9 m took 1350 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 440 N pushes a cart 6 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 480 N pushes a cart 10 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 470 N pushes a cart 3 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 10 m took 1400 J of work. What force was used, in newtons?
  27. 27.🏋️ A 10 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1750 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A force of 50 N pushes a cart 1 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
  37. 37.🏋️ A force of 70 N did 560 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 60 N did 120 J of work. How many metres did the object move?
  39. 39.🏋️ Pushing a crate 4 m took 720 J of work. What force was used, in newtons?
  40. 40.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. through a distance
  2. 4000
  3. joule (J)
  4. 7
  5. 270
  6. no, work stays the same
  7. 4
  8. 10
  9. 5
  10. 510
  11. 220
  12. 400
  13. 650
  14. 40
  15. 9
  16. less effort
  17. 6
  18. 140
  19. 10
  20. 5
  21. 150
  22. 2640
  23. 4800
  24. 450
  25. 1410
  26. 140
  27. 500
  28. 600
  29. 60
  30. 350
  31. 3
  32. 4
  33. 50
  34. 3
  35. 6
  36. load ÷ effort
  37. 8
  38. 2
  39. 180
  40. 350

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