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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 327 · 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 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ An 11 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.🏋️ Pushing a crate 1 m took 50 J of work. What force was used, in newtons?
  4. 4.🏋️ A force of 80 N did 400 J of work. How many metres did the object move?
  5. 5.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ Pushing a crate 1 m took 120 J of work. What force was used, in newtons?
  8. 8.🏋️ Pushing a crate 4 m took 720 J of work. What force was used, in newtons?
  9. 9.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
  12. 12.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ Pushing a crate 8 m took 1440 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 4 m took 1920 J of work. What force was used, in newtons?
  15. 15.🏋️ A 15 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 smooth ramp is 10 m long and rises 2 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  19. 19.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
  20. 20.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ 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?
  22. 22.🏋️ A force of 190 N did 380 J of work. How many metres did the object move?
  23. 23.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ Pushing a crate 4 m took 640 J of work. What force was used, in newtons?
  25. 25.🏋️ A force of 70 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Pushing a crate 8 m took 4000 J of work. What force was used, in newtons?
  28. 28.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
  29. 29.🏋️ A force of 350 N did 3150 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 340 N pushes a cart 5 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ 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?
  33. 33.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 140 N pushes a cart 6 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A force of 20 N did 140 J of work. How many metres did the object move?
  37. 37.🏋️ 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?
  38. 38.🏋️ Pushing a crate 3 m took 300 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 450 N did 3600 J of work. How many metres did the object move?
  40. 40.🏋️ 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?

Answer key

  1. 30
  2. 110
  3. 50
  4. 5
  5. 450
  6. 540
  7. 120
  8. 180
  9. 700
  10. 150
  11. joule (J)
  12. 400
  13. 180
  14. 480
  15. 600
  16. 500
  17. 600
  18. less effort
  19. through a distance
  20. 6
  21. 200
  22. 2
  23. 600
  24. 160
  25. 140
  26. 3
  27. 500
  28. no, work stays the same
  29. 9
  30. 1700
  31. 600
  32. 520
  33. 50
  34. 6
  35. 840
  36. 7
  37. 750
  38. 100
  39. 8
  40. 80

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