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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 785 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ Pushing a crate 7 m took 1540 J of work. What force was used, in newtons?
  2. 2.🏋️ A force of 70 N pushes a cart 10 m along the floor. How much work is done, in joules?
  3. 3.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ 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?
  5. 5.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 10 N did 60 J of work. How many metres did the object move?
  7. 7.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ Pushing a crate 7 m took 700 J of work. What force was used, in newtons?
  9. 9.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) without moving it (d) very slowly
  10. 10.🏋️ Pushing a crate 8 m took 2880 J of work. What force was used, in newtons?
  11. 11.🏋️ 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?
  12. 12.🏋️ Pushing a crate 3 m took 390 J of work. What force was used, in newtons?
  13. 13.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ Pushing a crate 10 m took 1200 J of work. What force was used, in newtons?
  15. 15.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
  16. 16.🏋️ A force of 140 N did 140 J of work. How many metres did the object move?
  17. 17.🏋️ 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?
  18. 18.🏋️ A force of 500 N pushes a cart 1 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 270 N pushes a cart 4 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 70 N did 490 J of work. How many metres did the object move?
  21. 21.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A force of 350 N pushes a cart 10 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
  25. 25.🏋️ A force of 480 N did 3360 J of work. How many metres did the object move?
  26. 26.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1750 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ Pushing a crate 7 m took 350 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 360 N did 360 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 370 N pushes a cart 6 m along the floor. How much work is done, in joules?
  30. 30.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
  31. 31.🏋️ A force of 170 N pushes a cart 2 m along the floor. How much work is done, in joules?
  32. 32.🏋️ Pushing a crate 9 m took 2610 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 70 N pushes a cart 1 m along the floor. How much work is done, in joules?
  34. 34.🏋️ 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?
  35. 35.🏋️ A force of 200 N did 200 J of work. How many metres did the object move?
  36. 36.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  37. 37.🏋️ A force of 420 N pushes a cart 1 m along the floor. How much work is done, in joules?
  38. 38.🏋️ 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)
  39. 39.🏋️ 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?
  40. 40.🏋️ Pushing a crate 9 m took 3420 J of work. What force was used, in newtons?

Answer key

  1. 220
  2. 700
  3. 400
  4. 1000
  5. 900
  6. 6
  7. 3
  8. 100
  9. through a distance
  10. 360
  11. 450
  12. 130
  13. 50
  14. 120
  15. less effort
  16. 1
  17. 600
  18. 500
  19. 1080
  20. 7
  21. 950
  22. 500
  23. 3500
  24. no, work stays the same
  25. 7
  26. 350
  27. 50
  28. 1
  29. 2220
  30. load ÷ effort
  31. 340
  32. 290
  33. 70
  34. 130
  35. 1
  36. joule (J)
  37. 420
  38. 50
  39. 350
  40. 380

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