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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 237 · 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 force of 470 N pushes a cart 10 m along the floor. How much work is done, in joules?
  2. 2.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
  3. 3.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  6. 6.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  7. 7.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ Pushing a crate 2 m took 220 J of work. What force was used, in newtons?
  9. 9.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
  10. 10.🏋️ Pushing a crate 2 m took 820 J of work. What force was used, in newtons?
  11. 11.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A force of 350 N did 1400 J of work. How many metres did the object move?
  14. 14.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A force of 280 N pushes a cart 6 m along the floor. How much work is done, in joules?
  17. 17.🏋️ An 8 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 3900 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 80 N pushes a cart 10 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 280 N pushes a cart 9 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 6 m took 360 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 9 m took 630 J of work. What force was used, in newtons?
  26. 26.🏋️ 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
  27. 27.🏋️ Pushing a crate 3 m took 420 J of work. What force was used, in newtons?
  28. 28.🏋️ 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)
  29. 29.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A force of 200 N pushes a cart 4 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ Pushing a crate 9 m took 720 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 100 N pushes a cart 1 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 190 N did 570 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 290 N did 870 J of work. How many metres did the object move?
  36. 36.🏋️ A 16 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A force of 50 N did 400 J of work. How many metres did the object move?
  38. 38.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ Pushing a crate 3 m took 720 J of work. What force was used, in newtons?
  40. 40.🏋️ Pushing a crate 5 m took 1300 J of work. What force was used, in newtons?

Answer key

  1. 4700
  2. through a distance
  3. 250
  4. 850
  5. less effort
  6. joule (J)
  7. 2
  8. 110
  9. load ÷ effort
  10. 410
  11. 3
  12. 200
  13. 4
  14. 140
  15. 600
  16. 1680
  17. 160
  18. 480
  19. 650
  20. 350
  21. 90
  22. 800
  23. 2520
  24. 60
  25. 70
  26. no, work stays the same
  27. 140
  28. 450
  29. 2
  30. 800
  31. 3
  32. 80
  33. 100
  34. 3
  35. 3
  36. 160
  37. 8
  38. 60
  39. 240
  40. 260

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