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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 634 · 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 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ Pushing a crate 5 m took 900 J of work. What force was used, in newtons?
  4. 4.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ Pushing a crate 3 m took 690 J of work. What force was used, in newtons?
  6. 6.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
  7. 7.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
  8. 8.🏋️ A force of 50 N pushes a cart 10 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ Pushing a crate 4 m took 40 J of work. What force was used, in newtons?
  12. 12.🏋️ A force of 260 N did 1300 J of work. How many metres did the object move?
  13. 13.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ 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?
  16. 16.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
  17. 17.🏋️ Pushing a crate 4 m took 840 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 70 N pushes a cart 7 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  21. 21.🏋️ 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?
  22. 22.🏋️ 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?
  23. 23.🏋️ A force of 10 N did 70 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 360 N pushes a cart 6 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 110 N did 220 J of work. How many metres did the object move?
  27. 27.🏋️ 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?
  28. 28.🏋️ A force of 280 N did 560 J of work. How many metres did the object move?
  29. 29.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ Pushing a crate 7 m took 490 J of work. What force was used, in newtons?
  31. 31.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 240 N did 240 J of work. How many metres did the object move?
  33. 33.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A force of 430 N did 1720 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 270 N did 1620 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 200 N pushes a cart 3 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A force of 490 N pushes a cart 9 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)

Answer key

  1. 240
  2. 4
  3. 180
  4. 950
  5. 230
  6. no, work stays the same
  7. load ÷ effort
  8. 500
  9. 3
  10. 2
  11. 10
  12. 5
  13. 5
  14. 5
  15. 260
  16. 450
  17. 210
  18. 490
  19. 500
  20. through a distance
  21. 200
  22. 250
  23. 7
  24. 2160
  25. 6
  26. 2
  27. 60
  28. 2
  29. 5
  30. 70
  31. 5
  32. 1
  33. 760
  34. 4
  35. 6
  36. 600
  37. 30
  38. 4410
  39. 400
  40. joule (J)

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