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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 631 · 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 machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ An 18 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A force of 320 N pushes a cart 9 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
  6. 6.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
  7. 7.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
  11. 11.🏋️ A force of 320 N did 2880 J of work. How many metres did the object move?
  12. 12.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  13. 13.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A force of 180 N pushes a cart 7 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 280 N pushes a cart 10 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A 1 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ Pushing a crate 10 m took 2600 J of work. What force was used, in newtons?
  20. 20.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ 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?
  22. 22.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
  23. 23.🏋️ Pushing a crate 6 m took 2040 J of work. What force was used, in newtons?
  24. 24.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
  25. 25.🏋️ Pushing a crate 3 m took 1080 J of work. What force was used, in newtons?
  26. 26.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ Pushing a crate 9 m took 540 J of work. What force was used, in newtons?
  30. 30.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 230 N did 1610 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 390 N did 390 J of work. How many metres did the object move?
  33. 33.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 490 N did 2940 J of work. How many metres did the object move?
  35. 35.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ Pushing a crate 9 m took 1260 J of work. What force was used, in newtons?
  37. 37.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?

Answer key

  1. 3
  2. 900
  3. 2880
  4. 40
  5. through a distance
  6. load ÷ effort
  7. 100
  8. 50
  9. 70
  10. joule (J)
  11. 9
  12. less effort
  13. 150
  14. 1260
  15. 4
  16. 510
  17. 2800
  18. 20
  19. 260
  20. 6
  21. 450
  22. 2
  23. 340
  24. no, work stays the same
  25. 360
  26. 350
  27. 800
  28. 700
  29. 60
  30. 150
  31. 7
  32. 1
  33. 5
  34. 6
  35. 6
  36. 140
  37. 650
  38. 400
  39. 200
  40. 5

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