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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 686 · 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) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
  2. 2.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A force of 160 N pushes a cart 2 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A force of 320 N did 640 J of work. How many metres did the object move?
  5. 5.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  6. 6.🏋️ Pushing a crate 2 m took 240 J of work. What force was used, in newtons?
  7. 7.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 480 N pushes a cart 5 m along the floor. How much work is done, in joules?
  11. 11.🏋️ Pushing a crate 5 m took 2050 J of work. What force was used, in newtons?
  12. 12.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
  13. 13.🏋️ A force of 180 N pushes a cart 3 m along the floor. How much work is done, in joules?
  14. 14.🏋️ Pushing a crate 2 m took 700 J of work. What force was used, in newtons?
  15. 15.🏋️ A force of 460 N pushes a cart 2 m along the floor. How much work is done, in joules?
  16. 16.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
  17. 17.🏋️ A force of 190 N pushes a cart 3 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Pushing a crate 8 m took 4000 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 440 N did 3520 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 20 N did 40 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 410 N did 410 J of work. How many metres did the object move?
  22. 22.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A force of 100 N pushes a cart 3 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A force of 380 N did 380 J of work. How many metres did the object move?
  25. 25.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 410 N pushes a cart 8 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A force of 490 N pushes a cart 4 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 5 m took 1550 J of work. What force was used, in newtons?
  29. 29.🏋️ 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?
  30. 30.🏋️ A force of 140 N did 420 J of work. How many metres did the object move?
  31. 31.🏋️ Pushing a crate 5 m took 1450 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 120 N pushes a cart 6 m along the floor. How much work is done, in joules?
  34. 34.🏋️ Pushing a crate 1 m took 390 J of work. What force was used, in newtons?
  35. 35.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
  39. 39.🏋️ 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?
  40. 40.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?

Answer key

  1. no, work stays the same
  2. 3
  3. 320
  4. 2
  5. less effort
  6. 120
  7. 250
  8. 1000
  9. 640
  10. 2400
  11. 410
  12. through a distance
  13. 540
  14. 350
  15. 920
  16. joule (J)
  17. 570
  18. 500
  19. 8
  20. 2
  21. 1
  22. 120
  23. 300
  24. 1
  25. 6
  26. 3280
  27. 1960
  28. 310
  29. 100
  30. 3
  31. 290
  32. 150
  33. 720
  34. 390
  35. 2
  36. 90
  37. 5
  38. load ÷ effort
  39. 360
  40. 6

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