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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 331 · 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) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  2. 2.🏋️ A force of 420 N pushes a cart 10 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A machine lifts a load of 660 N when you push with 110 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  5. 5.🏋️ An 8 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A force of 110 N did 770 J of work. How many metres did the object move?
  8. 8.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
  9. 9.🏋️ A 6 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
  11. 11.🏋️ A force of 430 N did 430 J of work. How many metres did the object move?
  12. 12.🏋️ A force of 210 N pushes a cart 6 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ Pushing a crate 3 m took 1260 J of work. What force was used, in newtons?
  15. 15.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 260 N did 2340 J of work. How many metres did the object move?
  20. 20.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  21. 21.🏋️ Pushing a crate 3 m took 480 J of work. What force was used, in newtons?
  22. 22.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ 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?
  24. 24.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 10 N pushes a cart 8 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ Pushing a crate 4 m took 1080 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 350 N did 2100 J of work. How many metres did the object move?
  30. 30.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A force of 20 N pushes a cart 9 m along the floor. How much work is done, in joules?
  32. 32.🏋️ 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?
  33. 33.🏋️ Pushing a crate 4 m took 1720 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 110 N pushes a cart 5 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 400 N pushes a cart 7 m along the floor. How much work is done, in joules?
  36. 36.🏋️ Pushing a crate 3 m took 60 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 230 N pushes a cart 6 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 400 N pushes a cart 1 m along the floor. How much work is done, in joules?
  39. 39.🏋️ Pushing a crate 1 m took 490 J of work. What force was used, in newtons?
  40. 40.🏋️ A force of 50 N did 50 J of work. How many metres did the object move?

Answer key

  1. joule (J)
  2. 4200
  3. 6
  4. load ÷ effort
  5. 320
  6. 560
  7. 7
  8. less effort
  9. 180
  10. no, work stays the same
  11. 1
  12. 1260
  13. 2
  14. 420
  15. 850
  16. 80
  17. 850
  18. 5
  19. 9
  20. through a distance
  21. 160
  22. 150
  23. 10
  24. 300
  25. 80
  26. 400
  27. 3
  28. 270
  29. 6
  30. 150
  31. 180
  32. 150
  33. 430
  34. 550
  35. 2800
  36. 20
  37. 1380
  38. 400
  39. 490
  40. 1

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