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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 438 · 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 machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A force of 80 N did 400 J of work. How many metres did the object move?
  3. 3.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
  4. 4.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
  5. 5.🏋️ A force of 190 N pushes a cart 1 m along the floor. How much work is done, in joules?
  6. 6.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
  7. 7.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A machine lifts a load of 1140 N when you push with 190 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 290 N did 290 J of work. How many metres did the object move?
  10. 10.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ A force of 290 N pushes a cart 2 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Pushing a crate 8 m took 160 J of work. What force was used, in newtons?
  14. 14.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 250 N pushes a cart 5 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 190 N did 1520 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 140 N pushes a cart 6 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 170 N did 1530 J of work. How many metres did the object move?
  19. 19.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) only on Mondays (d) yes, always
  22. 22.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ Pushing a crate 1 m took 90 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 130 N pushes a cart 7 m along the floor. How much work is done, in joules?
  25. 25.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
  26. 26.🏋️ A force of 370 N did 3700 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 500 N did 2000 J of work. How many metres did the object move?
  28. 28.🏋️ Pushing a crate 3 m took 30 J of work. What force was used, in newtons?
  29. 29.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ A force of 410 N pushes a cart 10 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 110 N did 990 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 110 N pushes a cart 2 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 150 N did 1350 J of work. How many metres did the object move?
  35. 35.🏋️ Pushing a crate 3 m took 810 J of work. What force was used, in newtons?
  36. 36.🏋️ Pushing a crate 7 m took 420 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 90 N did 450 J of work. How many metres did the object move?
  38. 38.🏋️ A machine lifts a load of 950 N when you push with 190 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 40 N did 120 J of work. How many metres did the object move?

Answer key

  1. 2
  2. 5
  3. joule (J)
  4. less effort
  5. 190
  6. load ÷ effort
  7. 4
  8. 6
  9. 1
  10. 700
  11. 90
  12. 580
  13. 20
  14. 250
  15. 1250
  16. 8
  17. 840
  18. 9
  19. 5
  20. 6
  21. no, work stays the same
  22. 100
  23. 90
  24. 910
  25. through a distance
  26. 10
  27. 4
  28. 10
  29. 1000
  30. 4100
  31. 6
  32. 9
  33. 220
  34. 9
  35. 270
  36. 60
  37. 5
  38. 5
  39. 2
  40. 3

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