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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 248 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ Pushing a crate 7 m took 490 J of work. What force was used, in newtons?
  2. 2.🏋️ A force of 120 N pushes a cart 6 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A force of 300 N did 900 J of work. How many metres did the object move?
  4. 4.🏋️ A force of 450 N pushes a cart 4 m along the floor. How much work is done, in joules?
  5. 5.🏋️ Pushing a crate 9 m took 1080 J of work. What force was used, in newtons?
  6. 6.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  8. 8.🏋️ A force of 400 N pushes a cart 9 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A force of 50 N did 150 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 170 N pushes a cart 3 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A 14 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
  15. 15.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ 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?
  21. 21.🏋️ A force of 440 N did 2200 J of work. How many metres did the object move?
  22. 22.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A 16 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
  27. 27.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ Pushing a crate 4 m took 1120 J of work. What force was used, in newtons?
  29. 29.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
  32. 32.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
  33. 33.🏋️ A force of 240 N did 480 J of work. How many metres did the object move?
  34. 34.🏋️ Pushing a crate 7 m took 1190 J of work. What force was used, in newtons?
  35. 35.🏋️ Pushing a crate 10 m took 4400 J of work. What force was used, in newtons?
  36. 36.🏋️ A force of 350 N did 1050 J of work. How many metres did the object move?
  37. 37.🏋️ Pushing a crate 4 m took 160 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 280 N pushes a cart 3 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 70
  2. 720
  3. 3
  4. 1800
  5. 120
  6. 3
  7. joule (J)
  8. 3600
  9. 3
  10. 510
  11. 2
  12. 420
  13. 360
  14. no, work stays the same
  15. 850
  16. 700
  17. 100
  18. 250
  19. 900
  20. 1000
  21. 5
  22. 400
  23. 480
  24. 3
  25. 5
  26. load ÷ effort
  27. 6
  28. 280
  29. 2
  30. 750
  31. through a distance
  32. less effort
  33. 2
  34. 170
  35. 440
  36. 3
  37. 40
  38. 840
  39. 5
  40. 350

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