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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 308 · 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 machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A force of 190 N pushes a cart 5 m along the floor. How much work is done, in joules?
  4. 4.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
  5. 5.🏋️ 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?
  6. 6.🏋️ A force of 80 N pushes a cart 7 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Pushing a crate 2 m took 260 J of work. What force was used, in newtons?
  8. 8.🏋️ Pushing a crate 4 m took 960 J of work. What force was used, in newtons?
  9. 9.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 10 N did 90 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 500 N did 3000 J of work. How many metres did the object move?
  14. 14.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ Pushing a crate 3 m took 120 J of work. What force was used, in newtons?
  16. 16.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  17. 17.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
  18. 18.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A force of 280 N did 1120 J of work. How many metres did the object move?
  22. 22.🏋️ Pushing a crate 7 m took 350 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 320 N did 640 J of work. How many metres did the object move?
  24. 24.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 330 N did 1650 J of work. How many metres did the object move?
  26. 26.🏋️ Pushing a crate 9 m took 3870 J of work. What force was used, in newtons?
  27. 27.🏋️ Pushing a crate 5 m took 100 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 20 N did 80 J of work. How many metres did the object move?
  29. 29.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
  30. 30.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 30 N did 30 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 240 N did 2160 J of work. How many metres did the object move?
  33. 33.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 180 N pushes a cart 1 m along the floor. How much work is done, in joules?
  36. 36.🏋️ Pushing a crate 3 m took 1050 J of work. What force was used, in newtons?
  37. 37.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
  38. 38.🏋️ A force of 150 N pushes a cart 8 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ Pushing a crate 9 m took 1350 J of work. What force was used, in newtons?

Answer key

  1. 3
  2. 950
  3. 950
  4. joule (J)
  5. 300
  6. 560
  7. 130
  8. 240
  9. 950
  10. 5
  11. 550
  12. 9
  13. 6
  14. 600
  15. 40
  16. through a distance
  17. no, work stays the same
  18. 350
  19. 750
  20. 600
  21. 4
  22. 50
  23. 2
  24. 2
  25. 5
  26. 430
  27. 20
  28. 4
  29. less effort
  30. 700
  31. 1
  32. 9
  33. 4
  34. 3
  35. 180
  36. 350
  37. load ÷ effort
  38. 1200
  39. 750
  40. 150

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