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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 541 · 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.

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  1. 1.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
  2. 2.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
  3. 3.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
  4. 4.🏋️ Pushing a crate 2 m took 440 J of work. What force was used, in newtons?
  5. 5.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ Pushing a crate 5 m took 950 J of work. What force was used, in newtons?
  7. 7.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  8. 8.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ Pushing a crate 5 m took 400 J of work. What force was used, in newtons?
  10. 10.🏋️ A 16 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A force of 10 N pushes a cart 5 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 220 N did 880 J of work. How many metres did the object move?
  13. 13.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ 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?
  15. 15.🏋️ A force of 150 N pushes a cart 9 m along the floor. How much work is done, in joules?
  16. 16.🏋️ Pushing a crate 7 m took 630 J of work. What force was used, in newtons?
  17. 17.🏋️ A force of 80 N pushes a cart 2 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 90 N did 180 J of work. How many metres did the object move?
  19. 19.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Pushing a crate 1 m took 150 J of work. What force was used, in newtons?
  22. 22.🏋️ Pushing a crate 4 m took 1480 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 150 N pushes a cart 8 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 3 m took 60 J of work. What force was used, in newtons?
  25. 25.🏋️ A force of 130 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 350 N did 1050 J of work. How many metres did the object move?
  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 370 N did 1480 J of work. How many metres did the object move?
  29. 29.🏋️ 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?
  30. 30.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 490 N pushes a cart 10 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A 19 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ 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?
  37. 37.🏋️ A force of 460 N pushes a cart 1 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 320 N pushes a cart 6 m along the floor. How much work is done, in joules?
  39. 39.🏋️ Pushing a crate 5 m took 1150 J of work. What force was used, in newtons?
  40. 40.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?

Answer key

  1. joule (J)
  2. load ÷ effort
  3. through a distance
  4. 220
  5. 20
  6. 190
  7. less effort
  8. 720
  9. 80
  10. 160
  11. 50
  12. 4
  13. 120
  14. 400
  15. 1350
  16. 90
  17. 160
  18. 2
  19. 5
  20. 5
  21. 150
  22. 370
  23. 1200
  24. 20
  25. 260
  26. 3
  27. no, work stays the same
  28. 4
  29. 250
  30. 2
  31. 4
  32. 4900
  33. 3
  34. 300
  35. 950
  36. 10
  37. 460
  38. 1920
  39. 230
  40. 3

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