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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 919 · 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 force of 500 N pushes a cart 2 m along the floor. How much work is done, in joules?
  2. 2.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  3. 3.🏋️ Pushing a crate 7 m took 70 J of work. What force was used, in newtons?
  4. 4.🏋️ Pushing a crate 1 m took 320 J of work. What force was used, in newtons?
  5. 5.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ 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?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
  8. 8.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
  9. 9.🏋️ A 19 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ Pushing a crate 8 m took 3760 J of work. What force was used, in newtons?
  11. 11.🏋️ Pushing a crate 2 m took 480 J of work. What force was used, in newtons?
  12. 12.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
  16. 16.🏋️ A machine lifts a load of 570 N when you push with 190 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  18. 18.🏋️ 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)
  19. 19.🏋️ A force of 470 N pushes a cart 5 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 170 N did 510 J of work. How many metres did the object move?
  21. 21.🏋️ Pushing a crate 6 m took 1620 J of work. What force was used, in newtons?
  22. 22.🏋️ A 6 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 smooth ramp is 12 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 30 N pushes a cart 8 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 2 m took 820 J of work. What force was used, in newtons?
  27. 27.🏋️ 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)
  28. 28.🏋️ 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?
  29. 29.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A force of 470 N pushes a cart 1 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 300 N pushes a cart 5 m along the floor. How much work is done, in joules?
  33. 33.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
  34. 34.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A force of 340 N did 340 J of work. How many metres did the object move?
  37. 37.🏋️ A force of 80 N did 160 J of work. How many metres did the object move?
  38. 38.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ Pushing a crate 1 m took 270 J of work. What force was used, in newtons?
  40. 40.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?

Answer key

  1. 1000
  2. joule (J)
  3. 10
  4. 320
  5. 2
  6. 70
  7. no, work stays the same
  8. through a distance
  9. 380
  10. 470
  11. 240
  12. 240
  13. 2
  14. 4
  15. 4
  16. 3
  17. less effort
  18. 250
  19. 2350
  20. 3
  21. 270
  22. 180
  23. 600
  24. 5
  25. 240
  26. 410
  27. 750
  28. 400
  29. 3
  30. 4
  31. 470
  32. 1500
  33. load ÷ effort
  34. 80
  35. 150
  36. 1
  37. 2
  38. 150
  39. 270
  40. 6

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