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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 147 · 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 2 m long and rises 1 m. What effort pushes a 700 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 180 N pushes a cart 6 m along the floor. How much work is done, in joules?
  3. 3.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
  5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  6. 6.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) without moving it (d) very slowly
  7. 7.🏋️ Pushing a crate 2 m took 140 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 280 N pushes a cart 8 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ Pushing a crate 5 m took 1150 J of work. What force was used, in newtons?
  11. 11.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ Pushing a crate 2 m took 960 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 20 N did 160 J of work. How many metres did the object move?
  15. 15.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A force of 270 N did 1350 J of work. How many metres did the object move?
  17. 17.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 220 N did 2200 J of work. How many metres did the object move?
  20. 20.🏋️ Pushing a crate 3 m took 1500 J of work. What force was used, in newtons?
  21. 21.🏋️ A machine lifts a load of 1080 N when you push with 180 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ Pushing a crate 9 m took 270 J of work. What force was used, in newtons?
  24. 24.🏋️ Pushing a crate 8 m took 400 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 10 m took 3700 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 260 N pushes a cart 2 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A force of 390 N pushes a cart 2 m along the floor. How much work is done, in joules?
  29. 29.🏋️ Pushing a crate 1 m took 320 J of work. What force was used, in newtons?
  30. 30.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
  31. 31.🏋️ A force of 340 N pushes a cart 7 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ Pushing a crate 4 m took 2000 J of work. What force was used, in newtons?
  34. 34.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ Pushing a crate 10 m took 5000 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 440 N did 4400 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 100 N pushes a cart 9 m along the floor. How much work is done, in joules?
  39. 39.🏋️ Pushing a crate 5 m took 200 J of work. What force was used, in newtons?
  40. 40.🏋️ Pushing a crate 3 m took 300 J of work. What force was used, in newtons?

Answer key

  1. 350
  2. 1080
  3. 80
  4. joule (J)
  5. no, work stays the same
  6. through a distance
  7. 70
  8. 2240
  9. 6
  10. 230
  11. 700
  12. 750
  13. 480
  14. 8
  15. 560
  16. 5
  17. 4
  18. 2
  19. 10
  20. 500
  21. 6
  22. 50
  23. 30
  24. 50
  25. 370
  26. 520
  27. 800
  28. 780
  29. 320
  30. less effort
  31. 2380
  32. 950
  33. 500
  34. 900
  35. 4
  36. 500
  37. 10
  38. 900
  39. 40
  40. 100

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