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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 986 · 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 smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 410 N did 3690 J of work. How many metres did the object move?
  3. 3.🏋️ Pushing a crate 9 m took 2520 J of work. What force was used, in newtons?
  4. 4.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
  5. 5.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
  8. 8.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
  9. 9.🏋️ Pushing a crate 7 m took 1120 J of work. What force was used, in newtons?
  10. 10.🏋️ A force of 220 N pushes a cart 5 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A force of 150 N did 1050 J of work. How many metres did the object move?
  12. 12.🏋️ A force of 150 N did 300 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 6 m took 540 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 350 N did 2800 J of work. How many metres did the object move?
  15. 15.🏋️ 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?
  16. 16.🏋️ Pushing a crate 8 m took 3520 J of work. What force was used, in newtons?
  17. 17.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ Pushing a crate 9 m took 360 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 440 N pushes a cart 2 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 20 N pushes a cart 10 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ 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?
  23. 23.🏋️ A force of 10 N pushes a cart 8 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A machine lifts a load of 850 N when you push with 170 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 210 N pushes a cart 8 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 8 m took 2320 J of work. What force was used, in newtons?
  27. 27.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ 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?
  29. 29.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 50 N pushes a cart 1 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ 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?
  34. 34.🏋️ Pushing a crate 9 m took 1890 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 60 N pushes a cart 5 m along the floor. How much work is done, in joules?
  36. 36.🏋️ 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?
  37. 37.🏋️ Pushing a crate 6 m took 1800 J of work. What force was used, in newtons?
  38. 38.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  39. 39.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 450 N pushes a cart 1 m along the floor. How much work is done, in joules?

Answer key

  1. 50
  2. 9
  3. 280
  4. through a distance
  5. 5
  6. 6
  7. no, work stays the same
  8. load ÷ effort
  9. 160
  10. 1100
  11. 7
  12. 2
  13. 90
  14. 8
  15. 300
  16. 440
  17. 1000
  18. 40
  19. 880
  20. 200
  21. 200
  22. 140
  23. 80
  24. 5
  25. 1680
  26. 290
  27. 700
  28. 1000
  29. 450
  30. 100
  31. 50
  32. 200
  33. 90
  34. 210
  35. 300
  36. 400
  37. 300
  38. less effort
  39. 4
  40. 450

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