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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 724 · 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 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A force of 350 N pushes a cart 2 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
  5. 5.🏋️ A force of 420 N did 2100 J of work. How many metres did the object move?
  6. 6.🏋️ A 13 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ Pushing a crate 2 m took 880 J of work. What force was used, in newtons?
  9. 9.🏋️ Pushing a crate 3 m took 930 J of work. What force was used, in newtons?
  10. 10.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
  11. 11.🏋️ 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
  12. 12.🏋️ A force of 150 N pushes a cart 4 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
  14. 14.🏋️ A machine lifts a load of 640 N when you push with 160 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ Pushing a crate 9 m took 720 J of work. What force was used, in newtons?
  16. 16.🏋️ A machine lifts a load of 480 N when you push with 80 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ 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?
  18. 18.🏋️ A force of 90 N pushes a cart 7 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A force of 20 N pushes a cart 3 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A force of 10 N did 60 J of work. How many metres did the object move?
  24. 24.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ Pushing a crate 10 m took 100 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 170 N did 510 J of work. How many metres did the object move?
  27. 27.🏋️ Pushing a crate 9 m took 2070 J of work. What force was used, in newtons?
  28. 28.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
  29. 29.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A force of 180 N pushes a cart 6 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A force of 140 N did 1260 J of work. How many metres did the object move?
  33. 33.🏋️ An 11 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.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ Pushing a crate 7 m took 1330 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 230 N did 1150 J of work. How many metres did the object move?
  40. 40.🏋️ Pushing a crate 3 m took 1110 J of work. What force was used, in newtons?

Answer key

  1. 5
  2. 700
  3. 650
  4. through a distance
  5. 5
  6. 650
  7. 5
  8. 440
  9. 310
  10. less effort
  11. no, work stays the same
  12. 600
  13. load ÷ effort
  14. 4
  15. 80
  16. 6
  17. 90
  18. 630
  19. 2
  20. 450
  21. 60
  22. 200
  23. 6
  24. 340
  25. 10
  26. 3
  27. 230
  28. joule (J)
  29. 2
  30. 1080
  31. 1000
  32. 9
  33. 550
  34. 3
  35. 100
  36. 4
  37. 650
  38. 190
  39. 5
  40. 370

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