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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 672 · 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 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A force of 250 N did 2000 J of work. How many metres did the object move?
  3. 3.🏋️ Pushing a crate 6 m took 120 J of work. What force was used, in newtons?
  4. 4.🏋️ A force of 160 N pushes a cart 8 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A force of 20 N pushes a cart 5 m along the floor. How much work is done, in joules?
  6. 6.🏋️ Pushing a crate 3 m took 240 J of work. What force was used, in newtons?
  7. 7.🏋️ Pushing a crate 7 m took 1750 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 90 N pushes a cart 5 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
  10. 10.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
  12. 12.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
  13. 13.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  14. 14.🏋️ Pushing a crate 9 m took 3510 J of work. What force was used, in newtons?
  15. 15.🏋️ A force of 490 N did 980 J of work. How many metres did the object move?
  16. 16.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
  20. 20.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 20 N pushes a cart 4 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 470 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 30 N pushes a cart 8 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A force of 340 N pushes a cart 5 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ 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?
  33. 33.🏋️ Pushing a crate 9 m took 2610 J of work. What force was used, in newtons?
  34. 34.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ 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?
  37. 37.🏋️ A force of 120 N did 960 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 120 N pushes a cart 3 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 300 N pushes a cart 6 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 300 N did 300 J of work. How many metres did the object move?

Answer key

  1. 4
  2. 8
  3. 20
  4. 1280
  5. 100
  6. 80
  7. 250
  8. 450
  9. less effort
  10. 950
  11. joule (J)
  12. load ÷ effort
  13. through a distance
  14. 390
  15. 2
  16. 3
  17. 2
  18. 800
  19. no, work stays the same
  20. 60
  21. 240
  22. 80
  23. 5
  24. 3
  25. 940
  26. 300
  27. 240
  28. 5
  29. 4
  30. 1700
  31. 50
  32. 100
  33. 290
  34. 2
  35. 200
  36. 60
  37. 8
  38. 360
  39. 1800
  40. 1

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