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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 174 · 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.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  2. 2.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
  3. 3.🏋️ Pushing a crate 8 m took 640 J of work. What force was used, in newtons?
  4. 4.🏋️ A force of 270 N pushes a cart 10 m along the floor. How much work is done, in joules?
  5. 5.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  7. 7.🏋️ A force of 250 N did 1750 J of work. How many metres did the object move?
  8. 8.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A force of 430 N pushes a cart 2 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A force of 350 N did 1050 J of work. How many metres did the object move?
  11. 11.🏋️ Pushing a crate 7 m took 140 J of work. What force was used, in newtons?
  12. 12.🏋️ A 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A force of 110 N pushes a cart 4 m along the floor. How much work is done, in joules?
  16. 16.🏋️ 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?
  17. 17.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
  23. 23.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A force of 50 N did 450 J of work. How many metres did the object move?
  25. 25.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 400 N pushes a cart 5 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
  29. 29.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A force of 230 N did 690 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 490 N pushes a cart 1 m along the floor. How much work is done, in joules?
  32. 32.🏋️ Pushing a crate 10 m took 200 J of work. What force was used, in newtons?
  33. 33.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Pushing a crate 10 m took 700 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 400 N pushes a cart 7 m along the floor. How much work is done, in joules?
  36. 36.🏋️ Pushing a crate 8 m took 880 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 130 N pushes a cart 9 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 310 N did 310 J of work. How many metres did the object move?
  39. 39.🏋️ Pushing a crate 10 m took 1000 J of work. What force was used, in newtons?
  40. 40.🏋️ A force of 60 N did 360 J of work. How many metres did the object move?

Answer key

  1. through a distance
  2. no, work stays the same
  3. 80
  4. 2700
  5. 550
  6. joule (J)
  7. 7
  8. 60
  9. 860
  10. 3
  11. 20
  12. 600
  13. 800
  14. 5
  15. 440
  16. 40
  17. 400
  18. 2
  19. 3
  20. 5
  21. 3
  22. load ÷ effort
  23. 2
  24. 9
  25. 3
  26. 300
  27. 2000
  28. less effort
  29. 350
  30. 3
  31. 490
  32. 20
  33. 6
  34. 70
  35. 2800
  36. 110
  37. 1170
  38. 1
  39. 100
  40. 6

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