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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 587 · 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 smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  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 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
  6. 6.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ Pushing a crate 5 m took 550 J of work. What force was used, in newtons?
  8. 8.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  9. 9.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
  11. 11.🏋️ A machine lifts a load of 720 N when you push with 120 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A 3 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.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 430 N did 2150 J of work. How many metres did the object move?
  18. 18.🏋️ A force of 20 N pushes a cart 4 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ Pushing a crate 8 m took 1280 J of work. What force was used, in newtons?
  21. 21.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) no effort (d) more effort
  23. 23.🏋️ A force of 50 N pushes a cart 8 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 10 m took 1100 J of work. What force was used, in newtons?
  25. 25.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 70 N pushes a cart 10 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 8 m took 720 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 500 N did 500 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 480 N did 4800 J of work. How many metres did the object move?
  31. 31.🏋️ Pushing a crate 1 m took 480 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 9 m took 3060 J of work. What force was used, in newtons?
  33. 33.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ 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?
  37. 37.🏋️ A force of 390 N did 390 J of work. How many metres did the object move?
  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 force of 140 N did 840 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 140 N pushes a cart 7 m along the floor. How much work is done, in joules?

Answer key

  1. 200
  2. 600
  3. no, work stays the same
  4. 750
  5. load ÷ effort
  6. 2
  7. 110
  8. through a distance
  9. 120
  10. joule (J)
  11. 6
  12. 4
  13. 120
  14. 6
  15. 2
  16. 400
  17. 5
  18. 80
  19. 20
  20. 160
  21. 5
  22. less effort
  23. 400
  24. 110
  25. 250
  26. 450
  27. 700
  28. 90
  29. 1
  30. 10
  31. 480
  32. 340
  33. 600
  34. 250
  35. 700
  36. 280
  37. 1
  38. 300
  39. 6
  40. 980

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