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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 733 · 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.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  2. 2.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A force of 30 N pushes a cart 7 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ A force of 30 N did 30 J of work. How many metres did the object move?
  6. 6.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A force of 330 N pushes a cart 3 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A force of 30 N pushes a cart 1 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ Pushing a crate 4 m took 520 J of work. What force was used, in newtons?
  11. 11.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
  12. 12.🏋️ A force of 430 N pushes a cart 6 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A force of 390 N did 3900 J of work. How many metres did the object move?
  14. 14.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
  16. 16.🏋️ A force of 160 N pushes a cart 9 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 3 m took 480 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 450 N pushes a cart 8 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 70 N did 140 J of work. How many metres did the object move?
  20. 20.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) effort ÷ load (d) load × effort
  21. 21.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 190 N did 1710 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 380 N did 1520 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 360 N pushes a cart 3 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Pushing a crate 9 m took 3060 J of work. What force was used, in newtons?
  28. 28.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A force of 280 N did 280 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 400 N did 2000 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 150 N did 1350 J of work. How many metres did the object move?
  34. 34.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  36. 36.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
  37. 37.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A force of 120 N pushes a cart 4 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ 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)

Answer key

  1. joule (J)
  2. 450
  3. 210
  4. 130
  5. 1
  6. 270
  7. 990
  8. 30
  9. 450
  10. 130
  11. less effort
  12. 2580
  13. 10
  14. 300
  15. through a distance
  16. 1440
  17. 160
  18. 3600
  19. 2
  20. load ÷ effort
  21. 60
  22. 9
  23. 4
  24. 1080
  25. 250
  26. 2
  27. 340
  28. 800
  29. 6
  30. 120
  31. 1
  32. 5
  33. 9
  34. 300
  35. no, work stays the same
  36. 2
  37. 6
  38. 480
  39. 900
  40. 1000

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