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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 236 · 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.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
  3. 3.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  5. 5.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  6. 6.🏋️ An 18 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 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?
  8. 8.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A force of 180 N did 900 J of work. How many metres did the object move?
  12. 12.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?
  17. 17.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A force of 270 N pushes a cart 7 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A force of 430 N pushes a cart 1 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A force of 330 N did 1980 J of work. How many metres did the object move?
  22. 22.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A force of 490 N did 490 J of work. How many metres did the object move?
  25. 25.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ 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?
  28. 28.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
  29. 29.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
  30. 30.🏋️ A force of 410 N did 2050 J of work. How many metres did the object move?
  31. 31.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A force of 140 N did 280 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 3 m took 1080 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 340 N did 1700 J of work. How many metres did the object move?
  35. 35.🏋️ Pushing a crate 8 m took 3520 J of work. What force was used, in newtons?
  36. 36.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ Pushing a crate 6 m took 2940 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 400 N did 3200 J of work. How many metres did the object move?
  39. 39.🏋️ A force of 240 N pushes a cart 7 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 280 N did 280 J of work. How many metres did the object move?

Answer key

  1. 400
  2. no, work stays the same
  3. 600
  4. load ÷ effort
  5. through a distance
  6. 540
  7. 390
  8. 750
  9. 2
  10. 2
  11. 5
  12. 4
  13. 510
  14. 2
  15. 3
  16. 210
  17. 200
  18. 1890
  19. 10
  20. 430
  21. 6
  22. 450
  23. 90
  24. 1
  25. 700
  26. 3
  27. 140
  28. less effort
  29. joule (J)
  30. 5
  31. 100
  32. 2
  33. 360
  34. 5
  35. 440
  36. 2
  37. 490
  38. 8
  39. 1680
  40. 1

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