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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 577 · 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 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A force of 350 N pushes a cart 5 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ Pushing a crate 3 m took 330 J of work. What force was used, in newtons?
  5. 5.🏋️ Pushing a crate 5 m took 800 J of work. What force was used, in newtons?
  6. 6.🏋️ 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?
  7. 7.🏋️ A force of 470 N pushes a cart 7 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
  10. 10.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  11. 11.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
  12. 12.🏋️ Pushing a crate 1 m took 50 J of work. What force was used, in newtons?
  13. 13.🏋️ A force of 90 N did 360 J of work. How many metres did the object move?
  14. 14.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
  15. 15.🏋️ A force of 210 N pushes a cart 8 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ Pushing a crate 2 m took 320 J of work. What force was used, in newtons?
  19. 19.🏋️ 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)
  20. 20.🏋️ Pushing a crate 2 m took 820 J of work. What force was used, in newtons?
  21. 21.🏋️ Pushing a crate 2 m took 540 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 120 N pushes a cart 9 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 310 N did 310 J of work. How many metres did the object move?
  26. 26.🏋️ Pushing a crate 4 m took 360 J of work. What force was used, in newtons?
  27. 27.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ Pushing a crate 10 m took 2400 J of work. What force was used, in newtons?
  29. 29.🏋️ Pushing a crate 1 m took 300 J of work. What force was used, in newtons?
  30. 30.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 210 N pushes a cart 7 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 50 N did 150 J of work. How many metres did the object move?
  33. 33.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
  34. 34.🏋️ A 13 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ Pushing a crate 5 m took 1000 J of work. What force was used, in newtons?
  36. 36.🏋️ Pushing a crate 8 m took 1200 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 300 N pushes a cart 6 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 320 N did 1600 J of work. How many metres did the object move?
  39. 39.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 3
  2. 1750
  3. 50
  4. 110
  5. 160
  6. 70
  7. 3290
  8. 100
  9. through a distance
  10. joule (J)
  11. less effort
  12. 50
  13. 4
  14. no, work stays the same
  15. 1680
  16. 800
  17. 90
  18. 160
  19. 200
  20. 410
  21. 270
  22. 1080
  23. 5
  24. 5
  25. 1
  26. 90
  27. 200
  28. 240
  29. 300
  30. 200
  31. 1470
  32. 3
  33. load ÷ effort
  34. 520
  35. 200
  36. 150
  37. 1800
  38. 5
  39. 1000
  40. 190

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