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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 113 · 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 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
  4. 4.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A force of 70 N did 630 J of work. How many metres did the object move?
  9. 9.🏋️ Pushing a crate 7 m took 3010 J of work. What force was used, in newtons?
  10. 10.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A force of 280 N did 1680 J of work. How many metres did the object move?
  12. 12.🏋️ A 13 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A force of 470 N did 1410 J of work. How many metres did the object move?
  14. 14.🏋️ Pushing a crate 9 m took 1530 J of work. What force was used, in newtons?
  15. 15.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
  16. 16.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ Pushing a crate 10 m took 2800 J of work. What force was used, in newtons?
  18. 18.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 100 N pushes a cart 9 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  22. 22.🏋️ A force of 320 N did 640 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 20 N pushes a cart 9 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A force of 240 N pushes a cart 6 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 380 N pushes a cart 10 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
  29. 29.🏋️ A force of 440 N pushes a cart 7 m along the floor. How much work is done, in joules?
  30. 30.🏋️ Pushing a crate 8 m took 3360 J of work. What force was used, in newtons?
  31. 31.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
  32. 32.🏋️ A force of 440 N pushes a cart 5 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A 16 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A force of 170 N did 1700 J of work. How many metres did the object move?
  37. 37.🏋️ Pushing a crate 3 m took 300 J of work. What force was used, in newtons?
  38. 38.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
  39. 39.🏋️ Pushing a crate 5 m took 350 J of work. What force was used, in newtons?
  40. 40.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?

Answer key

  1. 20
  2. 2
  3. load ÷ effort
  4. 200
  5. 3
  6. 570
  7. 700
  8. 9
  9. 430
  10. 40
  11. 6
  12. 390
  13. 3
  14. 170
  15. 450
  16. 280
  17. 280
  18. 6
  19. 900
  20. 5
  21. joule (J)
  22. 2
  23. 180
  24. 1440
  25. 450
  26. 400
  27. 3800
  28. through a distance
  29. 3080
  30. 420
  31. less effort
  32. 2200
  33. 300
  34. 160
  35. 140
  36. 10
  37. 100
  38. no, work stays the same
  39. 70
  40. 450

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