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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 452 · 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 350 N when you push with 70 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ An 18 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
  5. 5.🏋️ 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?
  6. 6.🏋️ Pushing a crate 5 m took 1300 J of work. What force was used, in newtons?
  7. 7.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
  8. 8.🏋️ A force of 80 N pushes a cart 9 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 420 N did 3360 J of work. How many metres did the object move?
  11. 11.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ Pushing a crate 7 m took 1260 J of work. What force was used, in newtons?
  13. 13.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
  14. 14.🏋️ Pushing a crate 2 m took 240 J of work. What force was used, in newtons?
  15. 15.🏋️ Pushing a crate 2 m took 40 J of work. What force was used, in newtons?
  16. 16.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ Pushing a crate 10 m took 2300 J of work. What force was used, in newtons?
  18. 18.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ Pushing a crate 6 m took 2580 J of work. What force was used, in newtons?
  20. 20.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A force of 350 N pushes a cart 4 m along the floor. How much work is done, in joules?
  23. 23.🏋️ Pushing a crate 2 m took 300 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 280 N pushes a cart 3 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ Pushing a crate 10 m took 1500 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 260 N pushes a cart 9 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A force of 20 N did 180 J of work. How many metres did the object move?
  33. 33.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, by half (d) yes, always
  35. 35.🏋️ Pushing a crate 1 m took 300 J of work. What force was used, in newtons?
  36. 36.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 130 N pushes a cart 1 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A 12 kg box is lifted straight up by 4 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 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A force of 10 N did 40 J of work. How many metres did the object move?

Answer key

  1. 5
  2. 180
  3. 250
  4. load ÷ effort
  5. 200
  6. 260
  7. joule (J)
  8. 720
  9. 3
  10. 8
  11. 2
  12. 180
  13. less effort
  14. 120
  15. 20
  16. 400
  17. 230
  18. 120
  19. 430
  20. 2
  21. 300
  22. 1400
  23. 150
  24. 840
  25. 750
  26. 80
  27. 150
  28. 2340
  29. 400
  30. 100
  31. 500
  32. 9
  33. 400
  34. no, work stays the same
  35. 300
  36. 3
  37. 130
  38. 480
  39. 100
  40. 4

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