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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 157 · 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.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  2. 2.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ Pushing a crate 10 m took 3400 J of work. What force was used, in newtons?
  5. 5.🏋️ 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)
  6. 6.🏋️ A force of 450 N did 1800 J of work. How many metres did the object move?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
  8. 8.🏋️ Pushing a crate 9 m took 3510 J of work. What force was used, in newtons?
  9. 9.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
  10. 10.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 390 N did 1170 J of work. How many metres did the object move?
  13. 13.🏋️ 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?
  14. 14.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A force of 60 N did 600 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 60 N did 360 J of work. How many metres did the object move?
  18. 18.🏋️ A force of 470 N did 4230 J of work. How many metres did the object move?
  19. 19.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
  20. 20.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A force of 360 N did 2880 J of work. How many metres did the object move?
  22. 22.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 700 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ 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?
  26. 26.🏋️ A 17 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 230 N did 1380 J of work. How many metres did the object move?
  28. 28.🏋️ A force of 190 N did 190 J of work. How many metres did the object move?
  29. 29.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  32. 32.🏋️ Pushing a crate 3 m took 1140 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 50 N did 150 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 200 N did 400 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 140 N did 140 J of work. How many metres did the object move?
  36. 36.🏋️ 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?
  37. 37.🏋️ 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?
  38. 38.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ Pushing a crate 8 m took 1520 J of work. What force was used, in newtons?
  40. 40.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. through a distance
  2. 500
  3. 500
  4. 340
  5. 150
  6. 4
  7. no, work stays the same
  8. 390
  9. load ÷ effort
  10. 3
  11. 6
  12. 3
  13. 800
  14. 3
  15. 260
  16. 10
  17. 6
  18. 9
  19. joule (J)
  20. 60
  21. 8
  22. 5
  23. 350
  24. 650
  25. 300
  26. 850
  27. 6
  28. 1
  29. 240
  30. 60
  31. less effort
  32. 380
  33. 3
  34. 2
  35. 1
  36. 130
  37. 50
  38. 100
  39. 190
  40. 700

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