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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 571 · 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 6 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 190 N pushes a cart 8 m along the floor. How much work is done, in joules?
  3. 3.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
  4. 4.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
  6. 6.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  7. 7.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) only on Mondays (d) yes, always
  8. 8.🏋️ A force of 100 N pushes a cart 4 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ Pushing a crate 2 m took 500 J of work. What force was used, in newtons?
  11. 11.🏋️ A force of 420 N pushes a cart 10 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 340 N did 3060 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 6 m took 2700 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 9 m took 3150 J of work. What force was used, in newtons?
  15. 15.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 300 N did 1200 J of work. How many metres did the object move?
  17. 17.🏋️ Pushing a crate 4 m took 600 J of work. What force was used, in newtons?
  18. 18.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
  20. 20.🏋️ A force of 20 N did 200 J of work. How many metres did the object move?
  21. 21.🏋️ Pushing a crate 5 m took 1400 J of work. What force was used, in newtons?
  22. 22.🏋️ 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?
  23. 23.🏋️ A force of 500 N pushes a cart 1 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ 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?
  26. 26.🏋️ A force of 30 N did 30 J of work. How many metres did the object move?
  27. 27.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ Pushing a crate 4 m took 560 J of work. What force was used, in newtons?
  30. 30.🏋️ A force of 400 N pushes a cart 2 m along the floor. How much work is done, in joules?
  31. 31.🏋️ 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?
  32. 32.🏋️ A force of 120 N pushes a cart 4 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ Pushing a crate 1 m took 160 J of work. What force was used, in newtons?
  35. 35.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A force of 370 N did 2590 J of work. How many metres did the object move?
  37. 37.🏋️ Pushing a crate 2 m took 480 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
  39. 39.🏋️ A force of 420 N pushes a cart 9 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 470 N did 1410 J of work. How many metres did the object move?

Answer key

  1. 600
  2. 1520
  3. load ÷ effort
  4. 50
  5. through a distance
  6. joule (J)
  7. no, work stays the same
  8. 400
  9. 300
  10. 250
  11. 4200
  12. 9
  13. 450
  14. 350
  15. 6
  16. 4
  17. 150
  18. 3
  19. less effort
  20. 10
  21. 280
  22. 120
  23. 500
  24. 6
  25. 320
  26. 1
  27. 5
  28. 6
  29. 140
  30. 800
  31. 360
  32. 480
  33. 250
  34. 160
  35. 30
  36. 7
  37. 240
  38. 3
  39. 3780
  40. 3

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