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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 869 · 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.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A force of 190 N did 1900 J of work. How many metres did the object move?
  5. 5.🏋️ A force of 190 N did 950 J of work. How many metres did the object move?
  6. 6.🏋️ A force of 280 N pushes a cart 10 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Pushing a crate 10 m took 4000 J of work. What force was used, in newtons?
  8. 8.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
  9. 9.🏋️ 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
  10. 10.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
  11. 11.🏋️ An 8 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ Pushing a crate 7 m took 980 J of work. What force was used, in newtons?
  13. 13.🏋️ Pushing a crate 4 m took 480 J of work. What force was used, in newtons?
  14. 14.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ Pushing a crate 7 m took 210 J of work. What force was used, in newtons?
  16. 16.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ Pushing a crate 4 m took 1200 J of work. What force was used, in newtons?
  18. 18.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
  19. 19.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ A force of 130 N did 130 J of work. How many metres did the object move?
  21. 21.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  23. 23.🏋️ 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?
  24. 24.🏋️ A force of 280 N did 1400 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 210 N pushes a cart 8 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 360 N did 3600 J of work. How many metres did the object move?
  27. 27.🏋️ Pushing a crate 6 m took 600 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 350 N pushes a cart 2 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A 6 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A force of 430 N pushes a cart 2 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A force of 220 N pushes a cart 8 m along the floor. How much work is done, in joules?
  38. 38.🏋️ Pushing a crate 6 m took 720 J of work. What force was used, in newtons?
  39. 39.🏋️ Pushing a crate 6 m took 1920 J of work. What force was used, in newtons?
  40. 40.🏋️ A force of 200 N pushes a cart 7 m along the floor. How much work is done, in joules?

Answer key

  1. 5
  2. 30
  3. 50
  4. 10
  5. 5
  6. 2800
  7. 400
  8. through a distance
  9. no, work stays the same
  10. load ÷ effort
  11. 320
  12. 140
  13. 120
  14. 510
  15. 30
  16. 500
  17. 300
  18. joule (J)
  19. 150
  20. 1
  21. 3
  22. less effort
  23. 300
  24. 5
  25. 1680
  26. 10
  27. 100
  28. 700
  29. 950
  30. 200
  31. 1000
  32. 3
  33. 180
  34. 150
  35. 4
  36. 860
  37. 1760
  38. 120
  39. 320
  40. 1400

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