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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 975 · 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.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  2. 2.🏋️ A force of 260 N did 780 J of work. How many metres did the object move?
  3. 3.🏋️ A force of 340 N did 2720 J of work. How many metres did the object move?
  4. 4.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A force of 450 N pushes a cart 7 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
  7. 7.🏋️ 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?
  8. 8.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1300 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) metre (m) (d) joule (J)
  10. 10.🏋️ Pushing a crate 3 m took 690 J of work. What force was used, in newtons?
  11. 11.🏋️ 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)
  12. 12.🏋️ A force of 140 N did 980 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 4 m took 440 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 9 m took 990 J of work. What force was used, in newtons?
  15. 15.🏋️ Pushing a crate 9 m took 450 J of work. What force was used, in newtons?
  16. 16.🏋️ A force of 480 N pushes a cart 4 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A force of 450 N pushes a cart 1 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  20. 20.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ 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)
  22. 22.🏋️ A force of 80 N pushes a cart 5 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ Pushing a crate 5 m took 200 J of work. What force was used, in newtons?
  25. 25.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ A machine lifts a load of 360 N when you push with 90 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
  29. 29.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ Pushing a crate 8 m took 1520 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 140 N did 280 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 160 N did 320 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 390 N did 1170 J of work. How many metres did the object move?
  34. 34.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A force of 80 N did 80 J of work. How many metres did the object move?
  36. 36.🏋️ A machine lifts a load of 500 N when you push with 100 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 130 N pushes a cart 5 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 170 N pushes a cart 2 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 90 N pushes a cart 3 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 90 N did 90 J of work. How many metres did the object move?

Answer key

  1. load ÷ effort
  2. 3
  3. 8
  4. 4
  5. 3150
  6. less effort
  7. 760
  8. 650
  9. joule (J)
  10. 230
  11. 600
  12. 7
  13. 110
  14. 110
  15. 50
  16. 1920
  17. 450
  18. 150
  19. through a distance
  20. 50
  21. 300
  22. 400
  23. 6
  24. 40
  25. 4
  26. 3
  27. 4
  28. no, work stays the same
  29. 800
  30. 190
  31. 2
  32. 2
  33. 3
  34. 400
  35. 1
  36. 5
  37. 650
  38. 340
  39. 270
  40. 1

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