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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 361 · 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 longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
  2. 2.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
  3. 3.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  6. 6.🏋️ Pushing a crate 1 m took 430 J of work. What force was used, in newtons?
  7. 7.🏋️ Pushing a crate 3 m took 660 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 340 N pushes a cart 3 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A force of 210 N pushes a cart 1 m along the floor. How much work is done, in joules?
  11. 11.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load + effort (c) load ÷ effort (d) effort ÷ load
  12. 12.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ 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
  14. 14.🏋️ A force of 380 N did 3040 J of work. How many metres did the object move?
  15. 15.🏋️ A force of 80 N pushes a cart 7 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A force of 50 N did 350 J of work. How many metres did the object move?
  18. 18.🏋️ 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?
  19. 19.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A force of 460 N pushes a cart 2 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A force of 240 N pushes a cart 6 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 360 N pushes a cart 7 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 430 N pushes a cart 3 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A 5 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 smooth ramp is 6 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 40 N pushes a cart 9 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 140 N pushes a cart 1 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A 5 kg box is lifted straight up by 4 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 machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 10 N pushes a cart 6 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 440 N did 1760 J of work. How many metres did the object move?
  39. 39.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?

Answer key

  1. less effort
  2. through a distance
  3. 3
  4. 240
  5. joule (J)
  6. 430
  7. 220
  8. 1020
  9. 300
  10. 210
  11. load ÷ effort
  12. 3
  13. no, work stays the same
  14. 8
  15. 560
  16. 2
  17. 7
  18. 360
  19. 500
  20. 920
  21. 2
  22. 850
  23. 1440
  24. 50
  25. 2520
  26. 450
  27. 1290
  28. 250
  29. 300
  30. 950
  31. 360
  32. 140
  33. 200
  34. 3
  35. 4
  36. 5
  37. 60
  38. 4
  39. 1000
  40. 2

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