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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 406 · 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 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ A force of 490 N did 1960 J of work. How many metres did the object move?
  3. 3.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  5. 5.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 470 N did 4230 J of work. How many metres did the object move?
  7. 7.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ Pushing a crate 6 m took 120 J of work. What force was used, in newtons?
  12. 12.🏋️ Pushing a crate 9 m took 1710 J of work. What force was used, in newtons?
  13. 13.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
  15. 15.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A force of 100 N pushes a cart 3 m along the floor. How much work is done, in joules?
  17. 17.🏋️ 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?
  18. 18.🏋️ A force of 90 N pushes a cart 10 m along the floor. How much work is done, in joules?
  19. 19.🏋️ 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
  20. 20.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  22. 22.🏋️ 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)
  23. 23.🏋️ Pushing a crate 3 m took 330 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 70 N did 490 J of work. How many metres did the object move?
  25. 25.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ 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?
  27. 27.🏋️ A force of 330 N did 660 J of work. How many metres did the object move?
  28. 28.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ 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?
  30. 30.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ Pushing a crate 9 m took 1530 J of work. What force was used, in newtons?
  32. 32.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A force of 360 N did 2880 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 120 N pushes a cart 6 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ Pushing a crate 8 m took 3840 J of work. What force was used, in newtons?
  38. 38.🏋️ A force of 70 N did 280 J of work. How many metres did the object move?
  39. 39.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ Pushing a crate 8 m took 1360 J of work. What force was used, in newtons?

Answer key

  1. 360
  2. 4
  3. 350
  4. joule (J)
  5. 150
  6. 9
  7. 2
  8. 550
  9. 340
  10. 5
  11. 20
  12. 190
  13. 80
  14. load ÷ effort
  15. 700
  16. 300
  17. 40
  18. 900
  19. no, work stays the same
  20. 5
  21. less effort
  22. 450
  23. 110
  24. 7
  25. 720
  26. 250
  27. 2
  28. 250
  29. 200
  30. 3
  31. 170
  32. 450
  33. 20
  34. 8
  35. 720
  36. 140
  37. 480
  38. 4
  39. 2
  40. 170

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