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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 699 · 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 longer ramp to the same height needs … (a) no effort (b) less effort (c) the same effort (d) more effort
  2. 2.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  3. 3.🏋️ A force of 240 N did 2160 J of work. How many metres did the object move?
  4. 4.🏋️ A force of 190 N pushes a cart 2 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  10. 10.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  11. 11.🏋️ A machine lifts a load of 500 N when you push with 100 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ Pushing a crate 3 m took 270 J of work. What force was used, in newtons?
  13. 13.🏋️ Pushing a crate 10 m took 3400 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 1 m took 10 J of work. What force was used, in newtons?
  15. 15.🏋️ Pushing a crate 9 m took 4410 J of work. What force was used, in newtons?
  16. 16.🏋️ A machine lifts a load of 360 N when you push with 90 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ Pushing a crate 6 m took 2040 J of work. What force was used, in newtons?
  18. 18.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A force of 280 N pushes a cart 2 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 100 N pushes a cart 1 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 500 N did 1000 J of work. How many metres did the object move?
  24. 24.🏋️ Pushing a crate 8 m took 480 J of work. What force was used, in newtons?
  25. 25.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 70 N did 700 J of work. How many metres did the object move?
  27. 27.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ Pushing a crate 8 m took 2240 J of work. What force was used, in newtons?
  30. 30.🏋️ 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
  31. 31.🏋️ Pushing a crate 2 m took 560 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 200 N pushes a cart 2 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Pushing a crate 5 m took 1000 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 330 N pushes a cart 6 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A force of 230 N did 230 J of work. How many metres did the object move?
  37. 37.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?

Answer key

  1. less effort
  2. load ÷ effort
  3. 9
  4. 380
  5. 6
  6. 3
  7. 4
  8. 350
  9. joule (J)
  10. through a distance
  11. 5
  12. 90
  13. 340
  14. 10
  15. 490
  16. 4
  17. 340
  18. 850
  19. 560
  20. 700
  21. 450
  22. 100
  23. 2
  24. 60
  25. 5
  26. 10
  27. 80
  28. 360
  29. 280
  30. no, work stays the same
  31. 280
  32. 400
  33. 2
  34. 200
  35. 1980
  36. 1
  37. 200
  38. 140
  39. 30
  40. 2

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