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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 693 · 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) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  2. 2.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  3. 3.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A force of 80 N did 400 J of work. How many metres did the object move?
  5. 5.🏋️ A force of 310 N pushes a cart 3 m along the floor. How much work is done, in joules?
  6. 6.🏋️ 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?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  8. 8.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 210 N pushes a cart 8 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A force of 440 N pushes a cart 6 m along the floor. How much work is done, in joules?
  12. 12.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
  13. 13.🏋️ Pushing a crate 6 m took 2700 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 8 m took 1120 J of work. What force was used, in newtons?
  15. 15.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
  16. 16.🏋️ A force of 300 N pushes a cart 10 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 6 m took 3000 J of work. What force was used, in newtons?
  18. 18.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 390 N pushes a cart 3 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 470 N did 4700 J of work. How many metres did the object move?
  23. 23.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 170 N pushes a cart 3 m along the floor. How much work is done, in joules?
  27. 27.🏋️ Pushing a crate 4 m took 1480 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 120 N pushes a cart 9 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A force of 450 N pushes a cart 2 m along the floor. How much work is done, in joules?
  31. 31.🏋️ Pushing a crate 1 m took 150 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 340 N did 2380 J of work. How many metres did the object move?
  33. 33.🏋️ 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?
  34. 34.🏋️ A force of 140 N pushes a cart 1 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A force of 110 N did 990 J of work. How many metres did the object move?
  37. 37.🏋️ Pushing a crate 8 m took 2400 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 80 N pushes a cart 2 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 270 N pushes a cart 9 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 290 N did 1160 J of work. How many metres did the object move?

Answer key

  1. joule (J)
  2. through a distance
  3. 2
  4. 5
  5. 930
  6. 80
  7. no, work stays the same
  8. 150
  9. 2
  10. 1680
  11. 2640
  12. load ÷ effort
  13. 450
  14. 140
  15. less effort
  16. 3000
  17. 500
  18. 2
  19. 1170
  20. 250
  21. 5
  22. 10
  23. 450
  24. 950
  25. 2
  26. 510
  27. 370
  28. 1080
  29. 550
  30. 900
  31. 150
  32. 7
  33. 100
  34. 140
  35. 550
  36. 9
  37. 300
  38. 160
  39. 2430
  40. 4

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