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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 182 · 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.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
  2. 2.🏋️ A force of 90 N did 720 J of work. How many metres did the object move?
  3. 3.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  6. 6.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  7. 7.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A force of 240 N did 720 J of work. How many metres did the object move?
  9. 9.🏋️ A force of 410 N pushes a cart 2 m along the floor. How much work is done, in joules?
  10. 10.🏋️ Pushing a crate 5 m took 300 J of work. What force was used, in newtons?
  11. 11.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ Pushing a crate 3 m took 900 J of work. What force was used, in newtons?
  14. 14.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
  15. 15.🏋️ 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?
  16. 16.🏋️ Pushing a crate 7 m took 1190 J of work. What force was used, in newtons?
  17. 17.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A force of 220 N pushes a cart 8 m along the floor. How much work is done, in joules?
  20. 20.🏋️ Pushing a crate 5 m took 850 J of work. What force was used, in newtons?
  21. 21.🏋️ Pushing a crate 4 m took 800 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 170 N did 510 J of work. How many metres did the object move?
  23. 23.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
  24. 24.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 450 N did 1350 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 110 N did 550 J of work. How many metres did the object move?
  27. 27.🏋️ Pushing a crate 6 m took 1980 J of work. What force was used, in newtons?
  28. 28.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A force of 430 N did 430 J of work. How many metres did the object move?
  30. 30.🏋️ Pushing a crate 10 m took 800 J of work. What force was used, in newtons?
  31. 31.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ Pushing a crate 3 m took 210 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 480 N pushes a cart 3 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 280 N pushes a cart 2 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 360 N pushes a cart 8 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A force of 290 N pushes a cart 2 m along the floor. How much work is done, in joules?
  37. 37.🏋️ 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?
  38. 38.🏋️ Pushing a crate 8 m took 3600 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 90 N did 90 J of work. How many metres did the object move?
  40. 40.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. load ÷ effort
  2. 8
  3. 3
  4. 750
  5. through a distance
  6. less effort
  7. 150
  8. 3
  9. 820
  10. 60
  11. 6
  12. 360
  13. 300
  14. joule (J)
  15. 140
  16. 170
  17. 80
  18. 50
  19. 1760
  20. 170
  21. 200
  22. 3
  23. no, work stays the same
  24. 300
  25. 3
  26. 5
  27. 330
  28. 80
  29. 1
  30. 80
  31. 320
  32. 70
  33. 1440
  34. 560
  35. 2880
  36. 580
  37. 10
  38. 450
  39. 1
  40. 150

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