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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 313 · 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.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) yes, always (d) only on Mondays
  2. 2.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ Pushing a crate 10 m took 1900 J of work. What force was used, in newtons?
  4. 4.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) effort ÷ load (d) load + effort
  5. 5.🏋️ A force of 300 N pushes a cart 8 m along the floor. How much work is done, in joules?
  6. 6.🏋️ Pushing a crate 9 m took 2700 J of work. What force was used, in newtons?
  7. 7.🏋️ A force of 50 N did 350 J of work. How many metres did the object move?
  8. 8.🏋️ Pushing a crate 1 m took 410 J of work. What force was used, in newtons?
  9. 9.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ Pushing a crate 2 m took 640 J of work. What force was used, in newtons?
  11. 11.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ A force of 470 N pushes a cart 3 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
  14. 14.🏋️ A force of 100 N pushes a cart 3 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
  16. 16.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A machine lifts a load of 300 N when you push with 60 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ 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?
  20. 20.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  21. 21.🏋️ A force of 300 N did 600 J of work. How many metres did the object move?
  22. 22.🏋️ A force of 190 N pushes a cart 6 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 30 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 140 N pushes a cart 9 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A force of 220 N pushes a cart 8 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ 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?
  30. 30.🏋️ A force of 130 N pushes a cart 3 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A force of 370 N pushes a cart 3 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A force of 350 N pushes a cart 6 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 50 N did 100 J of work. How many metres did the object move?
  35. 35.🏋️ Pushing a crate 3 m took 1170 J of work. What force was used, in newtons?
  36. 36.🏋️ Pushing a crate 8 m took 3600 J of work. What force was used, in newtons?
  37. 37.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 390 N did 390 J of work. How many metres did the object move?

Answer key

  1. no, work stays the same
  2. 900
  3. 190
  4. load ÷ effort
  5. 2400
  6. 300
  7. 7
  8. 410
  9. 450
  10. 320
  11. 350
  12. 1410
  13. through a distance
  14. 300
  15. less effort
  16. 600
  17. 5
  18. 90
  19. 560
  20. joule (J)
  21. 2
  22. 1140
  23. 5
  24. 5
  25. 60
  26. 1260
  27. 1760
  28. 2
  29. 100
  30. 390
  31. 700
  32. 1110
  33. 2100
  34. 2
  35. 390
  36. 450
  37. 300
  38. 300
  39. 2
  40. 1

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