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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 440 · 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) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  2. 2.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) no effort (d) less effort
  3. 3.🏋️ Pushing a crate 2 m took 940 J of work. What force was used, in newtons?
  4. 4.🏋️ Pushing a crate 2 m took 280 J of work. What force was used, in newtons?
  5. 5.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ Pushing a crate 9 m took 4050 J of work. What force was used, in newtons?
  7. 7.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  11. 11.🏋️ A force of 200 N pushes a cart 7 m along the floor. How much work is done, in joules?
  12. 12.🏋️ Pushing a crate 1 m took 310 J of work. What force was used, in newtons?
  13. 13.🏋️ A force of 230 N pushes a cart 9 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ 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?
  16. 16.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A force of 250 N pushes a cart 5 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  20. 20.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
  21. 21.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
  24. 24.🏋️ 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)
  25. 25.🏋️ 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?
  26. 26.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ Pushing a crate 8 m took 320 J of work. What force was used, in newtons?
  29. 29.🏋️ A 1 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ 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)
  33. 33.🏋️ A force of 260 N pushes a cart 9 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 160 N did 320 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 120 N pushes a cart 2 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 380 N pushes a cart 9 m along the floor. How much work is done, in joules?

Answer key

  1. joule (J)
  2. less effort
  3. 470
  4. 140
  5. 450
  6. 450
  7. 900
  8. 760
  9. 150
  10. load ÷ effort
  11. 1400
  12. 310
  13. 2070
  14. 3
  15. 600
  16. 2
  17. 1250
  18. 5
  19. through a distance
  20. 3
  21. 4
  22. 4
  23. no, work stays the same
  24. 900
  25. 270
  26. 450
  27. 1000
  28. 40
  29. 40
  30. 640
  31. 2
  32. 700
  33. 2340
  34. 6
  35. 2
  36. 240
  37. 950
  38. 300
  39. 2
  40. 3420

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