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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 64 · 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.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  2. 2.🏋️ A force of 290 N pushes a cart 10 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A force of 400 N did 3600 J of work. How many metres did the object move?
  4. 4.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
  5. 5.🏋️ A force of 450 N pushes a cart 2 m along the floor. How much work is done, in joules?
  6. 6.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  7. 7.🏋️ Pushing a crate 8 m took 160 J of work. What force was used, in newtons?
  8. 8.🏋️ 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?
  9. 9.🏋️ A force of 350 N pushes a cart 3 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A force of 200 N did 2000 J of work. How many metres did the object move?
  11. 11.🏋️ A force of 130 N pushes a cart 4 m along the floor. How much work is done, in joules?
  12. 12.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  13. 13.🏋️ A force of 360 N did 720 J of work. How many metres did the object move?
  14. 14.🏋️ Pushing a crate 4 m took 880 J of work. What force was used, in newtons?
  15. 15.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 170 N pushes a cart 3 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 6 m took 780 J of work. What force was used, in newtons?
  18. 18.🏋️ Pushing a crate 7 m took 2590 J of work. What force was used, in newtons?
  19. 19.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  20. 20.🏋️ Pushing a crate 3 m took 1320 J of work. What force was used, in newtons?
  21. 21.🏋️ A force of 410 N pushes a cart 7 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 170 N pushes a cart 5 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 210 N pushes a cart 10 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 1 m took 350 J of work. What force was used, in newtons?
  27. 27.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 5700 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A force of 470 N pushes a cart 5 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A 3 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A force of 10 N pushes a cart 8 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Pushing a crate 7 m took 2310 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 130 N did 520 J of work. How many metres did the object move?
  36. 36.🏋️ Pushing a crate 2 m took 420 J of work. What force was used, in newtons?
  37. 37.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3900 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. load ÷ effort
  2. 2900
  3. 9
  4. joule (J)
  5. 900
  6. through a distance
  7. 20
  8. 200
  9. 1050
  10. 10
  11. 520
  12. no, work stays the same
  13. 2
  14. 220
  15. 3
  16. 510
  17. 130
  18. 370
  19. less effort
  20. 440
  21. 2870
  22. 4
  23. 850
  24. 800
  25. 2100
  26. 350
  27. 950
  28. 2350
  29. 90
  30. 300
  31. 80
  32. 4
  33. 2
  34. 330
  35. 4
  36. 210
  37. 100
  38. 150
  39. 80
  40. 650

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