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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 794 · 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) no effort (c) less effort (d) the same effort
  2. 2.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A force of 220 N pushes a cart 3 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A force of 50 N did 300 J of work. How many metres did the object move?
  8. 8.🏋️ A force of 300 N pushes a cart 8 m along the floor. How much work is done, in joules?
  9. 9.🏋️ Pushing a crate 3 m took 180 J of work. What force was used, in newtons?
  10. 10.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) only on Mondays (d) yes, by half
  15. 15.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
  16. 16.🏋️ A force of 460 N did 1380 J of work. How many metres did the object move?
  17. 17.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
  18. 18.🏋️ A force of 240 N pushes a cart 9 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 140 N did 420 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 380 N did 2280 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 30 N pushes a cart 2 m along the floor. How much work is done, in joules?
  22. 22.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) newton (N) (d) metre (m)
  23. 23.🏋️ A force of 230 N pushes a cart 5 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A force of 400 N pushes a cart 2 m along the floor. How much work is done, in joules?
  25. 25.🏋️ Pushing a crate 3 m took 150 J of work. What force was used, in newtons?
  26. 26.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 330 N pushes a cart 8 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.🏋️ A force of 200 N pushes a cart 4 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 40 N pushes a cart 10 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A force of 210 N did 210 J of work. How many metres did the object move?
  34. 34.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A force of 70 N did 210 J of work. How many metres did the object move?
  36. 36.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ Pushing a crate 3 m took 1110 J of work. What force was used, in newtons?
  38. 38.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. less effort
  2. 3
  3. 400
  4. 5
  5. 660
  6. 3
  7. 6
  8. 2400
  9. 60
  10. 100
  11. 100
  12. 200
  13. 160
  14. no, work stays the same
  15. through a distance
  16. 3
  17. load ÷ effort
  18. 2160
  19. 3
  20. 6
  21. 60
  22. joule (J)
  23. 1150
  24. 800
  25. 50
  26. 800
  27. 2640
  28. 3
  29. 800
  30. 400
  31. 800
  32. 4
  33. 1
  34. 1000
  35. 3
  36. 1000
  37. 370
  38. 300
  39. 200
  40. 550

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