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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 227 · 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) very slowly (b) through a distance (c) only upwards (d) without moving it
  2. 2.🏋️ A machine lifts a load of 360 N when you push with 90 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ Pushing a crate 5 m took 200 J of work. What force was used, in newtons?
  6. 6.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  7. 7.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A 1 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ 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?
  10. 10.🏋️ A force of 500 N did 1500 J of work. How many metres did the object move?
  11. 11.🏋️ Pushing a crate 10 m took 1800 J of work. What force was used, in newtons?
  12. 12.🏋️ A 6 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.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A force of 70 N pushes a cart 6 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A force of 80 N did 320 J of work. How many metres did the object move?
  17. 17.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  18. 18.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 360 N pushes a cart 6 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ Pushing a crate 9 m took 4050 J of work. What force was used, in newtons?
  22. 22.🏋️ Pushing a crate 6 m took 1440 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 300 N pushes a cart 9 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A 19 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 240 N pushes a cart 5 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A force of 360 N did 3600 J of work. How many metres did the object move?
  32. 32.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ Pushing a crate 9 m took 3690 J of work. What force was used, in newtons?
  34. 34.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
  35. 35.🏋️ 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)
  36. 36.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ Pushing a crate 8 m took 80 J of work. What force was used, in newtons?
  38. 38.🏋️ 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?
  39. 39.🏋️ A 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort

Answer key

  1. through a distance
  2. 4
  3. 260
  4. 4
  5. 40
  6. less effort
  7. 650
  8. 40
  9. 300
  10. 3
  11. 180
  12. 120
  13. 250
  14. 420
  15. 450
  16. 4
  17. joule (J)
  18. 2
  19. 2160
  20. 10
  21. 450
  22. 240
  23. 2700
  24. 200
  25. 240
  26. 400
  27. 3
  28. 60
  29. 380
  30. 1200
  31. 10
  32. 180
  33. 410
  34. no, work stays the same
  35. 350
  36. 650
  37. 10
  38. 340
  39. 600
  40. load ÷ effort

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