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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 756 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ A 7 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A force of 20 N did 200 J of work. How many metres did the object move?
  3. 3.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  4. 4.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 220 N pushes a cart 1 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Pushing a crate 7 m took 490 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 90 N did 720 J of work. How many metres did the object move?
  9. 9.🏋️ A force of 400 N did 2800 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 430 N pushes a cart 8 m along the floor. How much work is done, in joules?
  11. 11.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  12. 12.🏋️ Pushing a crate 8 m took 2720 J of work. What force was used, in newtons?
  13. 13.🏋️ A 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
  15. 15.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A force of 500 N did 2500 J of work. How many metres did the object move?
  18. 18.🏋️ A force of 300 N did 600 J of work. How many metres did the object move?
  19. 19.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?
  20. 20.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A force of 320 N pushes a cart 3 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 480 N when you push with 80 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
  27. 27.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) no, work stays the same (d) only on Mondays
  28. 28.🏋️ A force of 340 N did 2720 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 240 N pushes a cart 4 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 70 N did 140 J of work. How many metres did the object move?
  31. 31.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A force of 10 N pushes a cart 3 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Pushing a crate 8 m took 2640 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 410 N pushes a cart 7 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1750 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 30 N pushes a cart 3 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 110 N did 220 J of work. How many metres did the object move?

Answer key

  1. 210
  2. 10
  3. through a distance
  4. 150
  5. 200
  6. 220
  7. 70
  8. 8
  9. 7
  10. 3440
  11. joule (J)
  12. 340
  13. 150
  14. less effort
  15. 6
  16. 2
  17. 5
  18. 2
  19. 210
  20. 170
  21. 960
  22. 6
  23. 50
  24. 480
  25. 6
  26. load ÷ effort
  27. no, work stays the same
  28. 8
  29. 960
  30. 2
  31. 950
  32. 30
  33. 6
  34. 330
  35. 2870
  36. 350
  37. 90
  38. 150
  39. 4
  40. 2

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