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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 123 · 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 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A force of 340 N did 1700 J of work. How many metres did the object move?
  3. 3.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
  4. 4.🏋️ A force of 330 N did 1980 J of work. How many metres did the object move?
  5. 5.🏋️ A force of 160 N did 640 J of work. How many metres did the object move?
  6. 6.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A force of 160 N did 480 J of work. How many metres did the object move?
  8. 8.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A force of 70 N pushes a cart 1 m along the floor. How much work is done, in joules?
  11. 11.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
  12. 12.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  14. 14.🏋️ A force of 90 N pushes a cart 10 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  16. 16.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ A force of 240 N did 2160 J of work. How many metres did the object move?
  19. 19.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A force of 300 N pushes a cart 1 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A force of 200 N did 200 J of work. How many metres did the object move?
  24. 24.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 190 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 130 N pushes a cart 2 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ Pushing a crate 3 m took 1470 J of work. What force was used, in newtons?
  30. 30.🏋️ Pushing a crate 2 m took 900 J of work. What force was used, in newtons?
  31. 31.🏋️ Pushing a crate 10 m took 3700 J of work. What force was used, in newtons?
  32. 32.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
  34. 34.🏋️ Pushing a crate 5 m took 950 J of work. What force was used, in newtons?
  35. 35.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ Pushing a crate 2 m took 600 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 170 N did 510 J of work. How many metres did the object move?
  38. 38.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ Pushing a crate 3 m took 1200 J of work. What force was used, in newtons?

Answer key

  1. 6
  2. 5
  3. joule (J)
  4. 6
  5. 4
  6. 2
  7. 3
  8. 3
  9. 950
  10. 70
  11. through a distance
  12. 4
  13. no, work stays the same
  14. 900
  15. less effort
  16. 5
  17. 90
  18. 9
  19. 2
  20. 300
  21. 280
  22. 450
  23. 1
  24. 4
  25. 380
  26. 260
  27. 50
  28. 70
  29. 490
  30. 450
  31. 370
  32. 400
  33. load ÷ effort
  34. 190
  35. 550
  36. 300
  37. 3
  38. 3
  39. 360
  40. 400

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