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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 347 · 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.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  2. 2.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A force of 340 N did 2380 J of work. How many metres did the object move?
  4. 4.🏋️ A force of 180 N pushes a cart 3 m along the floor. How much work is done, in joules?
  5. 5.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  6. 6.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  7. 7.🏋️ A force of 400 N did 3600 J of work. How many metres did the object move?
  8. 8.🏋️ 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
  9. 9.🏋️ A force of 40 N did 120 J of work. How many metres did the object move?
  10. 10.🏋️ Pushing a crate 9 m took 1530 J of work. What force was used, in newtons?
  11. 11.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
  13. 13.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 50 N did 500 J of work. How many metres did the object move?
  16. 16.🏋️ A 7 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 440 N pushes a cart 6 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Pushing a crate 3 m took 90 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 290 N pushes a cart 8 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 350 N pushes a cart 1 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 130 N did 260 J of work. How many metres did the object move?
  24. 24.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 200 N did 1400 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 340 N pushes a cart 1 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A force of 170 N did 1190 J of work. How many metres did the object move?
  28. 28.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ 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?
  30. 30.🏋️ 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)
  31. 31.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ Pushing a crate 9 m took 2250 J of work. What force was used, in newtons?
  33. 33.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A force of 490 N pushes a cart 2 m along the floor. How much work is done, in joules?
  35. 35.🏋️ 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)
  36. 36.🏋️ A force of 240 N did 1920 J of work. How many metres did the object move?
  37. 37.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A force of 340 N did 1360 J of work. How many metres did the object move?
  39. 39.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A 13 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. through a distance
  2. 550
  3. 7
  4. 540
  5. load ÷ effort
  6. less effort
  7. 9
  8. no, work stays the same
  9. 3
  10. 170
  11. 3
  12. joule (J)
  13. 3
  14. 200
  15. 10
  16. 210
  17. 2640
  18. 30
  19. 2320
  20. 300
  21. 2
  22. 350
  23. 2
  24. 250
  25. 7
  26. 340
  27. 7
  28. 550
  29. 80
  30. 800
  31. 150
  32. 250
  33. 340
  34. 980
  35. 50
  36. 8
  37. 850
  38. 4
  39. 2
  40. 130

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