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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 848 · 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.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) metre (m) (d) joule (J)
  2. 2.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ Pushing a crate 1 m took 350 J of work. What force was used, in newtons?
  6. 6.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A force of 80 N did 640 J of work. How many metres did the object move?
  8. 8.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  10. 10.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ Pushing a crate 7 m took 770 J of work. What force was used, in newtons?
  13. 13.🏋️ Pushing a crate 3 m took 960 J of work. What force was used, in newtons?
  14. 14.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ Pushing a crate 5 m took 650 J of work. What force was used, in newtons?
  16. 16.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A force of 490 N pushes a cart 10 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A force of 120 N pushes a cart 9 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A force of 490 N pushes a cart 2 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 300 N did 600 J of work. How many metres did the object move?
  26. 26.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 110 N pushes a cart 7 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
  29. 29.🏋️ A force of 460 N pushes a cart 4 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A force of 140 N did 980 J of work. How many metres did the object move?
  32. 32.🏋️ 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?
  33. 33.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 330 N pushes a cart 4 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A force of 130 N did 390 J of work. How many metres did the object move?
  37. 37.🏋️ A force of 230 N did 920 J of work. How many metres did the object move?
  38. 38.🏋️ Pushing a crate 7 m took 210 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 330 N pushes a cart 1 m along the floor. How much work is done, in joules?
  40. 40.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half

Answer key

  1. joule (J)
  2. 3
  3. 3
  4. 50
  5. 350
  6. 100
  7. 8
  8. 100
  9. through a distance
  10. 6
  11. 40
  12. 110
  13. 320
  14. 250
  15. 130
  16. 550
  17. 800
  18. 4900
  19. 40
  20. 1080
  21. 320
  22. 6
  23. 500
  24. 980
  25. 2
  26. 400
  27. 770
  28. less effort
  29. 1840
  30. 2
  31. 7
  32. 760
  33. 2
  34. 5
  35. 1320
  36. 3
  37. 4
  38. 30
  39. 330
  40. no, work stays the same

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