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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 395 · 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.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) effort ÷ load (d) load ÷ effort
  2. 2.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  3. 3.🏋️ A machine lifts a load of 200 N when you push with 50 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A force of 340 N did 1700 J of work. How many metres did the object move?
  5. 5.🏋️ 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?
  6. 6.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) only upwards (d) without moving it
  7. 7.🏋️ 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?
  8. 8.🏋️ A force of 70 N pushes a cart 3 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A force of 500 N did 4500 J of work. How many metres did the object move?
  10. 10.🏋️ Pushing a crate 7 m took 1400 J of work. What force was used, in newtons?
  11. 11.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A 16 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ Pushing a crate 4 m took 1520 J of work. What force was used, in newtons?
  15. 15.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Pushing a crate 5 m took 1650 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 30 N did 240 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 140 N pushes a cart 9 m along the floor. How much work is done, in joules?
  21. 21.🏋️ Pushing a crate 2 m took 720 J of work. What force was used, in newtons?
  22. 22.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A force of 450 N did 2250 J of work. How many metres did the object move?
  24. 24.🏋️ Pushing a crate 8 m took 3360 J of work. What force was used, in newtons?
  25. 25.🏋️ A machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A machine lifts a load of 760 N when you push with 190 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
  29. 29.🏋️ Pushing a crate 9 m took 3780 J of work. What force was used, in newtons?
  30. 30.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ Pushing a crate 4 m took 1120 J of work. What force was used, in newtons?
  33. 33.🏋️ Pushing a crate 1 m took 90 J of work. What force was used, in newtons?
  34. 34.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
  37. 37.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ Pushing a crate 3 m took 210 J of work. What force was used, in newtons?
  39. 39.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A force of 480 N pushes a cart 10 m along the floor. How much work is done, in joules?

Answer key

  1. load ÷ effort
  2. less effort
  3. 4
  4. 5
  5. 30
  6. through a distance
  7. 40
  8. 210
  9. 9
  10. 200
  11. 400
  12. 160
  13. 6
  14. 380
  15. 800
  16. 5
  17. 6
  18. 330
  19. 8
  20. 1260
  21. 360
  22. 4
  23. 5
  24. 420
  25. 4
  26. 500
  27. 4
  28. no, work stays the same
  29. 420
  30. 3
  31. 200
  32. 280
  33. 90
  34. 1000
  35. 450
  36. joule (J)
  37. 250
  38. 70
  39. 400
  40. 4800

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