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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 997 · 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 390 N when you push with 130 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  5. 5.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
  6. 6.🏋️ Pushing a crate 3 m took 60 J of work. What force was used, in newtons?
  7. 7.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
  8. 8.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
  9. 9.🏋️ A force of 430 N did 430 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 70 N did 70 J of work. How many metres did the object move?
  11. 11.🏋️ A force of 280 N pushes a cart 6 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 400 N pushes a cart 9 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A force of 200 N pushes a cart 7 m along the floor. How much work is done, in joules?
  14. 14.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  15. 15.🏋️ A force of 220 N did 1320 J of work. How many metres did the object move?
  16. 16.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ 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?
  18. 18.🏋️ Pushing a crate 2 m took 540 J of work. What force was used, in newtons?
  19. 19.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A force of 140 N pushes a cart 7 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A force of 480 N did 3360 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 200 N pushes a cart 4 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 10 N did 70 J of work. How many metres did the object move?
  26. 26.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 130 N did 520 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 70 N pushes a cart 5 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 410 N pushes a cart 2 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 60 N pushes a cart 8 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A force of 400 N did 3200 J of work. How many metres did the object move?
  34. 34.🏋️ Pushing a crate 4 m took 880 J of work. What force was used, in newtons?
  35. 35.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ Pushing a crate 6 m took 2400 J of work. What force was used, in newtons?
  37. 37.🏋️ Pushing a crate 1 m took 140 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 130 N pushes a cart 10 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 600 N when you push with 150 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 3
  2. 750
  3. 50
  4. less effort
  5. load ÷ effort
  6. 20
  7. joule (J)
  8. through a distance
  9. 1
  10. 1
  11. 1680
  12. 3600
  13. 1400
  14. no, work stays the same
  15. 6
  16. 100
  17. 120
  18. 270
  19. 550
  20. 400
  21. 980
  22. 4
  23. 7
  24. 800
  25. 7
  26. 150
  27. 4
  28. 350
  29. 820
  30. 480
  31. 400
  32. 800
  33. 8
  34. 220
  35. 140
  36. 400
  37. 140
  38. 1300
  39. 4
  40. 450

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