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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 298 · 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 machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ Pushing a crate 3 m took 1200 J of work. What force was used, in newtons?
  3. 3.🏋️ A force of 30 N pushes a cart 9 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 240 N did 1440 J of work. How many metres did the object move?
  7. 7.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
  8. 8.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  9. 9.🏋️ A force of 490 N pushes a cart 4 m along the floor. How much work is done, in joules?
  10. 10.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  11. 11.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
  13. 13.🏋️ 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?
  14. 14.🏋️ A force of 460 N pushes a cart 10 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A force of 490 N did 4900 J of work. How many metres did the object move?
  16. 16.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ 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?
  20. 20.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A force of 100 N did 700 J of work. How many metres did the object move?
  22. 22.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A 16 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  27. 27.🏋️ A force of 220 N did 440 J of work. How many metres did the object move?
  28. 28.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 130 N did 390 J of work. How many metres did the object move?
  30. 30.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A 17 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A force of 240 N did 240 J of work. How many metres did the object move?
  35. 35.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A force of 260 N did 1820 J of work. How many metres did the object move?
  37. 37.🏋️ A force of 200 N did 1800 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 10 N pushes a cart 6 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 80 N pushes a cart 8 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 430 N did 2580 J of work. How many metres did the object move?

Answer key

  1. 5
  2. 400
  3. 270
  4. 250
  5. 750
  6. 6
  7. load ÷ effort
  8. no, work stays the same
  9. 1960
  10. through a distance
  11. 6
  12. joule (J)
  13. 60
  14. 4600
  15. 10
  16. 200
  17. 850
  18. 200
  19. 900
  20. 1000
  21. 7
  22. 700
  23. 3
  24. 250
  25. 480
  26. less effort
  27. 2
  28. 6
  29. 3
  30. 2
  31. 200
  32. 50
  33. 680
  34. 1
  35. 600
  36. 7
  37. 9
  38. 60
  39. 640
  40. 6

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