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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 527 · 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.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
  2. 2.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  3. 3.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A machine lifts a load of 200 N when you push with 50 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) the same effort (d) more effort
  8. 8.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
  9. 9.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 10 N did 30 J of work. How many metres did the object move?
  11. 11.🏋️ Pushing a crate 5 m took 1350 J of work. What force was used, in newtons?
  12. 12.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  13. 13.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ Pushing a crate 5 m took 600 J of work. What force was used, in newtons?
  15. 15.🏋️ 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?
  16. 16.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A force of 160 N pushes a cart 2 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 70 N pushes a cart 9 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 90 N did 450 J of work. How many metres did the object move?
  24. 24.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ An 18 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 390 N did 1560 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 110 N did 990 J of work. How many metres did the object move?
  29. 29.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ Pushing a crate 3 m took 540 J of work. What force was used, in newtons?
  32. 32.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ Pushing a crate 2 m took 460 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 150 N pushes a cart 3 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 280 N did 1960 J of work. How many metres did the object move?
  36. 36.🏋️ Pushing a crate 9 m took 90 J of work. What force was used, in newtons?
  37. 37.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. no, work stays the same
  2. joule (J)
  3. 250
  4. 4
  5. 600
  6. 500
  7. less effort
  8. load ÷ effort
  9. 2
  10. 3
  11. 270
  12. through a distance
  13. 760
  14. 120
  15. 10
  16. 3
  17. 650
  18. 2
  19. 600
  20. 5
  21. 320
  22. 630
  23. 5
  24. 250
  25. 180
  26. 350
  27. 4
  28. 9
  29. 300
  30. 60
  31. 180
  32. 50
  33. 230
  34. 450
  35. 7
  36. 10
  37. 640
  38. 6
  39. 950
  40. 150

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