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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 194 · 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) very slowly (c) through a distance (d) without moving it
  2. 2.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
  6. 6.🏋️ 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?
  7. 7.🏋️ A force of 40 N pushes a cart 3 m along the floor. How much work is done, in joules?
  8. 8.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A force of 390 N did 390 J of work. How many metres did the object move?
  10. 10.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  11. 11.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
  12. 12.🏋️ Pushing a crate 4 m took 1120 J of work. What force was used, in newtons?
  13. 13.🏋️ Pushing a crate 4 m took 1200 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 120 N pushes a cart 1 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
  17. 17.🏋️ 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)
  18. 18.🏋️ 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?
  19. 19.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
  20. 20.🏋️ Pushing a crate 8 m took 3680 J of work. What force was used, in newtons?
  21. 21.🏋️ Pushing a crate 3 m took 1260 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 460 N did 1380 J of work. How many metres did the object move?
  23. 23.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 80 N did 640 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 270 N pushes a cart 9 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 420 N pushes a cart 10 m along the floor. How much work is done, in joules?
  33. 33.🏋️ 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?
  34. 34.🏋️ A force of 160 N pushes a cart 9 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A force of 140 N pushes a cart 1 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A force of 110 N did 660 J of work. How many metres did the object move?
  39. 39.🏋️ Pushing a crate 4 m took 400 J of work. What force was used, in newtons?
  40. 40.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. through a distance
  2. 5
  3. 6
  4. 50
  5. 250
  6. 120
  7. 120
  8. 220
  9. 1
  10. joule (J)
  11. load ÷ effort
  12. 280
  13. 300
  14. 120
  15. 760
  16. less effort
  17. 250
  18. 60
  19. no, work stays the same
  20. 460
  21. 420
  22. 3
  23. 150
  24. 500
  25. 8
  26. 2430
  27. 400
  28. 3
  29. 200
  30. 4
  31. 6
  32. 4200
  33. 1000
  34. 1440
  35. 5
  36. 140
  37. 4
  38. 6
  39. 100
  40. 120

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