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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 134 · 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 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ Pushing a crate 7 m took 420 J of work. What force was used, in newtons?
  4. 4.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
  6. 6.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ Pushing a crate 1 m took 180 J of work. What force was used, in newtons?
  8. 8.🏋️ A machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
  11. 11.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) less effort (d) the same effort
  12. 12.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
  16. 16.🏋️ A force of 420 N pushes a cart 10 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A force of 240 N did 480 J of work. How many metres did the object move?
  18. 18.🏋️ Pushing a crate 2 m took 760 J of work. What force was used, in newtons?
  19. 19.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ Pushing a crate 9 m took 2520 J of work. What force was used, in newtons?
  23. 23.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A force of 290 N did 1450 J of work. How many metres did the object move?
  26. 26.🏋️ Pushing a crate 7 m took 490 J of work. What force was used, in newtons?
  27. 27.🏋️ 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
  28. 28.🏋️ A force of 390 N did 780 J of work. How many metres did the object move?
  29. 29.🏋️ A 14 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 smooth ramp is 9 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A machine lifts a load of 480 N when you push with 80 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Pushing a crate 3 m took 1410 J of work. What force was used, in newtons?
  35. 35.🏋️ Pushing a crate 1 m took 100 J of work. What force was used, in newtons?
  36. 36.🏋️ A machine lifts a load of 360 N when you push with 90 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 460 N did 920 J of work. How many metres did the object move?
  38. 38.🏋️ Pushing a crate 8 m took 2080 J of work. What force was used, in newtons?
  39. 39.🏋️ A force of 150 N pushes a cart 2 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?

Answer key

  1. 600
  2. 170
  3. 60
  4. 400
  5. 2
  6. 250
  7. 180
  8. 4
  9. 2
  10. through a distance
  11. less effort
  12. 3
  13. 550
  14. 30
  15. joule (J)
  16. 4200
  17. 2
  18. 380
  19. 1000
  20. 5
  21. 550
  22. 280
  23. 4
  24. 450
  25. 5
  26. 70
  27. no, work stays the same
  28. 2
  29. 280
  30. 500
  31. 6
  32. 190
  33. 2
  34. 470
  35. 100
  36. 4
  37. 2
  38. 260
  39. 300
  40. 3

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