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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 197 · 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 80 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A force of 380 N did 3420 J of work. How many metres did the object move?
  4. 4.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  5. 5.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
  6. 6.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ 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?
  8. 8.🏋️ Pushing a crate 7 m took 630 J of work. What force was used, in newtons?
  9. 9.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
  10. 10.🏋️ A force of 410 N did 4100 J of work. How many metres did the object move?
  11. 11.🏋️ A 17 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.🏋️ 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)
  13. 13.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ Pushing a crate 3 m took 990 J of work. What force was used, in newtons?
  15. 15.🏋️ A force of 220 N pushes a cart 1 m along the floor. How much work is done, in joules?
  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.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
  18. 18.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ Pushing a crate 1 m took 140 J of work. What force was used, in newtons?
  20. 20.🏋️ 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)
  21. 21.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 100 N did 800 J of work. How many metres did the object move?
  23. 23.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A force of 340 N did 1360 J of work. How many metres did the object move?
  27. 27.🏋️ A machine lifts a load of 500 N when you push with 100 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 330 N did 660 J of work. How many metres did the object move?
  29. 29.🏋️ 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?
  30. 30.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) only on Mondays (d) yes, always
  31. 31.🏋️ Pushing a crate 5 m took 2050 J of work. What force was used, in newtons?
  32. 32.🏋️ A force of 10 N did 30 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 5 m took 250 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 110 N did 1100 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 380 N did 1900 J of work. How many metres did the object move?
  36. 36.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 40 N pushes a cart 6 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ Pushing a crate 8 m took 4000 J of work. What force was used, in newtons?
  40. 40.🏋️ A force of 160 N did 1120 J of work. How many metres did the object move?

Answer key

  1. 3
  2. 3
  3. 9
  4. through a distance
  5. less effort
  6. 450
  7. 30
  8. 90
  9. joule (J)
  10. 10
  11. 170
  12. 350
  13. 1000
  14. 330
  15. 220
  16. 550
  17. load ÷ effort
  18. 5
  19. 140
  20. 950
  21. 3
  22. 8
  23. 480
  24. 6
  25. 550
  26. 4
  27. 5
  28. 2
  29. 760
  30. no, work stays the same
  31. 410
  32. 3
  33. 50
  34. 10
  35. 5
  36. 150
  37. 240
  38. 4
  39. 500
  40. 7

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