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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 117 · 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 9 m long and rises 3 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) metre (m) (d) watt hour
  3. 3.🏋️ Pushing a crate 7 m took 2660 J of work. What force was used, in newtons?
  4. 4.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ Pushing a crate 3 m took 30 J of work. What force was used, in newtons?
  6. 6.🏋️ A force of 150 N did 1500 J of work. How many metres did the object move?
  7. 7.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
  9. 9.🏋️ A force of 30 N did 150 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 150 N did 300 J of work. How many metres did the object move?
  11. 11.🏋️ Pushing a crate 3 m took 1020 J of work. What force was used, in newtons?
  12. 12.🏋️ A force of 360 N pushes a cart 2 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Pushing a crate 9 m took 3420 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 370 N pushes a cart 2 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 280 N pushes a cart 3 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 2 m took 660 J of work. What force was used, in newtons?
  18. 18.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) effort ÷ load (d) load ÷ effort
  20. 20.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ Pushing a crate 2 m took 680 J of work. What force was used, in newtons?
  22. 22.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
  24. 24.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
  25. 25.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 300 N pushes a cart 8 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A force of 350 N pushes a cart 4 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A force of 210 N did 1890 J of work. How many metres did the object move?
  29. 29.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ Pushing a crate 5 m took 100 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 10 m took 3200 J of work. What force was used, in newtons?
  33. 33.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A 1 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ Pushing a crate 1 m took 360 J of work. What force was used, in newtons?
  36. 36.🏋️ A 17 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ Pushing a crate 7 m took 1540 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 260 N pushes a cart 3 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 410 N did 2050 J of work. How many metres did the object move?

Answer key

  1. 650
  2. joule (J)
  3. 380
  4. 3
  5. 10
  6. 10
  7. 180
  8. less effort
  9. 5
  10. 2
  11. 340
  12. 720
  13. 380
  14. 740
  15. 6
  16. 840
  17. 330
  18. 240
  19. load ÷ effort
  20. 200
  21. 340
  22. 4
  23. no, work stays the same
  24. through a distance
  25. 4
  26. 2400
  27. 1400
  28. 9
  29. 5
  30. 2
  31. 20
  32. 320
  33. 300
  34. 30
  35. 360
  36. 850
  37. 400
  38. 220
  39. 780
  40. 5

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