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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 937 · 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 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A force of 50 N pushes a cart 1 m along the floor. How much work is done, in joules?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  4. 4.🏋️ A force of 220 N did 1980 J of work. How many metres did the object move?
  5. 5.🏋️ A force of 210 N did 630 J of work. How many metres did the object move?
  6. 6.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ Pushing a crate 10 m took 900 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 470 N pushes a cart 6 m along the floor. How much work is done, in joules?
  9. 9.🏋️ 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?
  10. 10.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
  11. 11.🏋️ A force of 390 N pushes a cart 3 m along the floor. How much work is done, in joules?
  12. 12.🏋️ Pushing a crate 8 m took 640 J of work. What force was used, in newtons?
  13. 13.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A force of 400 N pushes a cart 9 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A force of 320 N did 2880 J of work. How many metres did the object move?
  16. 16.🏋️ Pushing a crate 4 m took 280 J of work. What force was used, in newtons?
  17. 17.🏋️ A force of 390 N did 780 J of work. How many metres did the object move?
  18. 18.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 210 N did 1890 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 200 N did 200 J of work. How many metres did the object move?
  21. 21.🏋️ 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?
  22. 22.🏋️ A 7 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 460 N pushes a cart 2 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ 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?
  27. 27.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  28. 28.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 370 N did 370 J of work. How many metres did the object move?
  30. 30.🏋️ Pushing a crate 1 m took 380 J of work. What force was used, in newtons?
  31. 31.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ Pushing a crate 1 m took 70 J of work. What force was used, in newtons?
  33. 33.🏋️ Pushing a crate 6 m took 540 J of work. What force was used, in newtons?
  34. 34.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  35. 35.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A machine lifts a load of 540 N when you push with 90 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ Pushing a crate 3 m took 480 J of work. What force was used, in newtons?
  38. 38.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  39. 39.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?

Answer key

  1. 600
  2. 50
  3. no, work stays the same
  4. 9
  5. 3
  6. 120
  7. 90
  8. 2820
  9. 20
  10. load ÷ effort
  11. 1170
  12. 80
  13. 450
  14. 3600
  15. 9
  16. 70
  17. 2
  18. 4
  19. 9
  20. 1
  21. 550
  22. 70
  23. 920
  24. 900
  25. 350
  26. 30
  27. less effort
  28. 40
  29. 1
  30. 380
  31. 800
  32. 70
  33. 90
  34. through a distance
  35. 3
  36. 6
  37. 160
  38. joule (J)
  39. 50
  40. 3

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