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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 355 · 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.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
  2. 2.🏋️ A force of 450 N pushes a cart 2 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
  5. 5.🏋️ Pushing a crate 2 m took 280 J of work. What force was used, in newtons?
  6. 6.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A force of 230 N pushes a cart 7 m along the floor. How much work is done, in joules?
  9. 9.🏋️ 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?
  10. 10.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
  11. 11.🏋️ Pushing a crate 2 m took 800 J of work. What force was used, in newtons?
  12. 12.🏋️ A force of 120 N pushes a cart 3 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ Pushing a crate 1 m took 30 J of work. What force was used, in newtons?
  15. 15.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  16. 16.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A force of 450 N did 1350 J of work. How many metres did the object move?
  18. 18.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 210 N pushes a cart 7 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A force of 120 N pushes a cart 7 m along the floor. How much work is done, in joules?
  22. 22.🏋️ 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?
  23. 23.🏋️ Pushing a crate 9 m took 3690 J of work. What force was used, in newtons?
  24. 24.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 350 N did 2800 J of work. How many metres did the object move?
  27. 27.🏋️ Pushing a crate 4 m took 1080 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 190 N did 760 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 20 N pushes a cart 10 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 20 N did 120 J of work. How many metres did the object move?
  33. 33.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A machine lifts a load of 480 N when you push with 80 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ Pushing a crate 2 m took 900 J of work. What force was used, in newtons?
  37. 37.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same

Answer key

  1. less effort
  2. 900
  3. 150
  4. load ÷ effort
  5. 140
  6. 540
  7. 400
  8. 1610
  9. 40
  10. through a distance
  11. 400
  12. 360
  13. 4
  14. 30
  15. joule (J)
  16. 5
  17. 3
  18. 4
  19. 1470
  20. 2
  21. 840
  22. 70
  23. 410
  24. 2
  25. 450
  26. 8
  27. 270
  28. 4
  29. 200
  30. 4
  31. 3
  32. 6
  33. 600
  34. 800
  35. 6
  36. 450
  37. 60
  38. 900
  39. 650
  40. no, work stays the same

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