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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 107 · 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.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
  3. 3.🏋️ Pushing a crate 8 m took 400 J of work. What force was used, in newtons?
  4. 4.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  5. 5.🏋️ Pushing a crate 7 m took 560 J of work. What force was used, in newtons?
  6. 6.🏋️ A force of 60 N pushes a cart 9 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A force of 190 N did 1140 J of work. How many metres did the object move?
  8. 8.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
  9. 9.🏋️ A force of 30 N pushes a cart 1 m along the floor. How much work is done, in joules?
  10. 10.🏋️ 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)
  11. 11.🏋️ Pushing a crate 10 m took 300 J of work. What force was used, in newtons?
  12. 12.🏋️ A force of 10 N pushes a cart 5 m along the floor. How much work is done, in joules?
  13. 13.🏋️ An 18 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ Pushing a crate 10 m took 2500 J of work. What force was used, in newtons?
  15. 15.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A force of 430 N did 1720 J of work. How many metres did the object move?
  18. 18.🏋️ A force of 180 N did 540 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 120 N pushes a cart 1 m along the floor. How much work is done, in joules?
  20. 20.🏋️ Pushing a crate 10 m took 4400 J of work. What force was used, in newtons?
  21. 21.🏋️ Pushing a crate 7 m took 3220 J of work. What force was used, in newtons?
  22. 22.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ Pushing a crate 5 m took 2500 J of work. What force was used, in newtons?
  25. 25.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  26. 26.🏋️ A force of 20 N pushes a cart 10 m along the floor. How much work is done, in joules?
  27. 27.🏋️ Pushing a crate 2 m took 100 J of work. What force was used, in newtons?
  28. 28.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ Pushing a crate 7 m took 1050 J of work. What force was used, in newtons?
  30. 30.🏋️ A force of 170 N did 1700 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 240 N pushes a cart 3 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ Pushing a crate 8 m took 960 J of work. What force was used, in newtons?
  34. 34.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, by half (d) yes, always
  37. 37.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A force of 500 N did 500 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 410 N did 2050 J of work. How many metres did the object move?

Answer key

  1. 300
  2. through a distance
  3. 50
  4. joule (J)
  5. 80
  6. 540
  7. 6
  8. less effort
  9. 30
  10. 300
  11. 30
  12. 50
  13. 900
  14. 250
  15. 400
  16. 250
  17. 4
  18. 3
  19. 120
  20. 440
  21. 460
  22. 4
  23. 6
  24. 500
  25. load ÷ effort
  26. 200
  27. 50
  28. 2
  29. 150
  30. 10
  31. 720
  32. 700
  33. 120
  34. 900
  35. 100
  36. no, work stays the same
  37. 2
  38. 200
  39. 1
  40. 5

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