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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 718 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ Pushing a crate 3 m took 810 J of work. What force was used, in newtons?
  2. 2.🏋️ A force of 300 N did 2100 J of work. How many metres did the object move?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
  4. 4.🏋️ A force of 210 N pushes a cart 2 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A 5 kg box is lifted straight up by 3 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) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
  7. 7.🏋️ A force of 70 N did 630 J of work. How many metres did the object move?
  8. 8.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ Pushing a crate 1 m took 270 J of work. What force was used, in newtons?
  11. 11.🏋️ A force of 90 N pushes a cart 1 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 180 N did 1620 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 450 N did 2250 J of work. How many metres did the object move?
  14. 14.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  19. 19.🏋️ A force of 10 N did 30 J of work. How many metres did the object move?
  20. 20.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 700 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ Pushing a crate 9 m took 3870 J of work. What force was used, in newtons?
  22. 22.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A force of 480 N did 2880 J of work. How many metres did the object move?
  24. 24.🏋️ Pushing a crate 4 m took 840 J of work. What force was used, in newtons?
  25. 25.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  26. 26.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ A force of 240 N pushes a cart 3 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ Pushing a crate 6 m took 360 J of work. What force was used, in newtons?
  30. 30.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 10 N pushes a cart 5 m along the floor. How much work is done, in joules?
  32. 32.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  33. 33.🏋️ A force of 60 N did 300 J of work. How many metres did the object move?
  34. 34.🏋️ 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?
  35. 35.🏋️ 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?
  36. 36.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A force of 150 N did 1050 J of work. How many metres did the object move?
  39. 39.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 270
  2. 7
  3. no, work stays the same
  4. 420
  5. 150
  6. joule (J)
  7. 9
  8. 3
  9. 5
  10. 270
  11. 90
  12. 9
  13. 5
  14. 450
  15. 3
  16. 700
  17. 100
  18. through a distance
  19. 3
  20. 350
  21. 430
  22. 5
  23. 6
  24. 210
  25. less effort
  26. 4
  27. 720
  28. 3
  29. 60
  30. 750
  31. 50
  32. load ÷ effort
  33. 5
  34. 80
  35. 170
  36. 750
  37. 750
  38. 7
  39. 5
  40. 1000

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