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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 786 · 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.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  2. 2.🏋️ An 11 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 machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ 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?
  5. 5.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
  6. 6.🏋️ A force of 120 N did 960 J of work. How many metres did the object move?
  7. 7.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ Pushing a crate 7 m took 2310 J of work. What force was used, in newtons?
  9. 9.🏋️ Pushing a crate 9 m took 4500 J of work. What force was used, in newtons?
  10. 10.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 360 N pushes a cart 3 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
  14. 14.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  15. 15.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) no effort (d) more effort
  18. 18.🏋️ A force of 380 N did 3040 J of work. How many metres did the object move?
  19. 19.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ Pushing a crate 6 m took 900 J of work. What force was used, in newtons?
  21. 21.🏋️ 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)
  22. 22.🏋️ Pushing a crate 8 m took 80 J of work. What force was used, in newtons?
  23. 23.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A force of 280 N did 2520 J of work. How many metres did the object move?
  25. 25.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ A force of 130 N pushes a cart 1 m along the floor. How much work is done, in joules?
  27. 27.🏋️ Pushing a crate 7 m took 2940 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 130 N pushes a cart 3 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ Pushing a crate 10 m took 2000 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 350 N did 700 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 220 N did 1320 J of work. How many metres did the object move?
  34. 34.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A 2 kg box is lifted straight up by 3 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 5 m took 450 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 460 N did 920 J of work. How many metres did the object move?
  39. 39.🏋️ Pushing a crate 6 m took 2400 J of work. What force was used, in newtons?
  40. 40.🏋️ A force of 350 N did 1400 J of work. How many metres did the object move?

Answer key

  1. no, work stays the same
  2. 550
  3. 4
  4. 140
  5. joule (J)
  6. 8
  7. 500
  8. 330
  9. 500
  10. 360
  11. 2
  12. 1080
  13. load ÷ effort
  14. through a distance
  15. 5
  16. 200
  17. less effort
  18. 8
  19. 260
  20. 150
  21. 50
  22. 10
  23. 650
  24. 9
  25. 100
  26. 130
  27. 420
  28. 390
  29. 100
  30. 1000
  31. 200
  32. 2
  33. 6
  34. 3
  35. 60
  36. 10
  37. 90
  38. 2
  39. 400
  40. 4

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