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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 284 · 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 400 N pushes a cart 7 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ A force of 200 N pushes a cart 2 m along the floor. How much work is done, in joules?
  5. 5.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
  6. 6.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  7. 7.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ Pushing a crate 7 m took 1680 J of work. What force was used, in newtons?
  9. 9.🏋️ A 13 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
  11. 11.🏋️ 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?
  12. 12.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A force of 60 N pushes a cart 2 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A 12 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A force of 140 N pushes a cart 7 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A force of 360 N pushes a cart 10 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
  19. 19.🏋️ Pushing a crate 7 m took 2520 J of work. What force was used, in newtons?
  20. 20.🏋️ A force of 340 N pushes a cart 1 m along the floor. How much work is done, in joules?
  21. 21.🏋️ Pushing a crate 7 m took 140 J of work. What force was used, in newtons?
  22. 22.🏋️ Pushing a crate 5 m took 800 J of work. What force was used, in newtons?
  23. 23.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A force of 190 N pushes a cart 9 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 20 N did 20 J of work. How many metres did the object move?
  27. 27.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 430 N did 2580 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 50 N pushes a cart 8 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A machine lifts a load of 660 N when you push with 110 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  33. 33.🏋️ Pushing a crate 5 m took 1300 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 480 N did 4320 J of work. How many metres did the object move?
  35. 35.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 140 N did 1400 J of work. How many metres did the object move?
  38. 38.🏋️ Pushing a crate 1 m took 330 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 210 N did 1260 J of work. How many metres did the object move?
  40. 40.🏋️ Pushing a crate 10 m took 100 J of work. What force was used, in newtons?

Answer key

  1. 2800
  2. 600
  3. 90
  4. 400
  5. through a distance
  6. less effort
  7. 550
  8. 240
  9. 390
  10. joule (J)
  11. 340
  12. 850
  13. 120
  14. 600
  15. 980
  16. 3600
  17. 250
  18. no, work stays the same
  19. 360
  20. 340
  21. 20
  22. 160
  23. 50
  24. 1710
  25. 6
  26. 1
  27. 3
  28. 6
  29. 400
  30. 900
  31. 6
  32. load ÷ effort
  33. 260
  34. 9
  35. 550
  36. 2
  37. 10
  38. 330
  39. 6
  40. 10

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