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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 239 · 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 340 N pushes a cart 8 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
  3. 3.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ A force of 270 N pushes a cart 5 m along the floor. How much work is done, in joules?
  5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  6. 6.🏋️ A force of 300 N pushes a cart 6 m along the floor. How much work is done, in joules?
  7. 7.🏋️ 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?
  8. 8.🏋️ A force of 290 N did 1160 J of work. How many metres did the object move?
  9. 9.🏋️ Pushing a crate 4 m took 360 J of work. What force was used, in newtons?
  10. 10.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A force of 340 N did 2380 J of work. How many metres did the object move?
  12. 12.🏋️ A force of 20 N did 100 J of work. How many metres did the object move?
  13. 13.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  14. 14.🏋️ Pushing a crate 1 m took 460 J of work. What force was used, in newtons?
  15. 15.🏋️ Pushing a crate 5 m took 2350 J of work. What force was used, in newtons?
  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 machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Pushing a crate 9 m took 3690 J of work. What force was used, in newtons?
  19. 19.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
  20. 20.🏋️ Pushing a crate 5 m took 1300 J of work. What force was used, in newtons?
  21. 21.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  22. 22.🏋️ A force of 150 N did 750 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 20 N pushes a cart 7 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A force of 270 N pushes a cart 2 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ 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)
  27. 27.🏋️ A force of 200 N did 1000 J of work. How many metres did the object move?
  28. 28.🏋️ A 13 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ Pushing a crate 4 m took 1320 J of work. What force was used, in newtons?
  30. 30.🏋️ Pushing a crate 7 m took 700 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 470 N did 940 J of work. How many metres did the object move?
  32. 32.🏋️ Pushing a crate 7 m took 2590 J of work. What force was used, in newtons?
  33. 33.🏋️ 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?
  34. 34.🏋️ Pushing a crate 2 m took 260 J of work. What force was used, in newtons?
  35. 35.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ 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?
  38. 38.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 480 N pushes a cart 3 m along the floor. How much work is done, in joules?

Answer key

  1. 2720
  2. less effort
  3. 360
  4. 1350
  5. no, work stays the same
  6. 1800
  7. 380
  8. 4
  9. 90
  10. 50
  11. 7
  12. 5
  13. joule (J)
  14. 460
  15. 470
  16. 210
  17. 3
  18. 410
  19. load ÷ effort
  20. 260
  21. through a distance
  22. 5
  23. 140
  24. 540
  25. 6
  26. 300
  27. 5
  28. 520
  29. 330
  30. 100
  31. 2
  32. 370
  33. 350
  34. 130
  35. 700
  36. 360
  37. 100
  38. 4
  39. 2
  40. 1440

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