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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 607 · 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 force of 450 N pushes a cart 4 m along the floor. How much work is done, in joules?
  2. 2.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ Pushing a crate 3 m took 30 J of work. What force was used, in newtons?
  4. 4.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
  5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  6. 6.🏋️ 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?
  7. 7.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Pushing a crate 6 m took 2100 J of work. What force was used, in newtons?
  10. 10.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ Pushing a crate 1 m took 470 J of work. What force was used, in newtons?
  12. 12.🏋️ A machine lifts a load of 760 N when you push with 190 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ Pushing a crate 6 m took 360 J of work. What force was used, in newtons?
  14. 14.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 410 N pushes a cart 8 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 6 m took 60 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 360 N pushes a cart 9 m along the floor. How much work is done, in joules?
  19. 19.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
  20. 20.🏋️ A force of 120 N did 960 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 390 N pushes a cart 9 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A force of 110 N pushes a cart 1 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  25. 25.🏋️ A force of 500 N did 1000 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 360 N pushes a cart 6 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A force of 20 N pushes a cart 5 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 40 N did 40 J of work. How many metres did the object move?
  30. 30.🏋️ 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?
  31. 31.🏋️ A force of 330 N pushes a cart 3 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A 12 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A force of 190 N did 570 J of work. How many metres did the object move?
  36. 36.🏋️ A 3 kg box is lifted straight up by 5 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 force of 170 N pushes a cart 7 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ Pushing a crate 7 m took 2380 J of work. What force was used, in newtons?

Answer key

  1. 1800
  2. 240
  3. 10
  4. load ÷ effort
  5. no, work stays the same
  6. 760
  7. 6
  8. 150
  9. 350
  10. 3
  11. 470
  12. 4
  13. 60
  14. 650
  15. 6
  16. 3280
  17. 10
  18. 3240
  19. joule (J)
  20. 8
  21. 3510
  22. 700
  23. 110
  24. less effort
  25. 2
  26. 2160
  27. 350
  28. 100
  29. 1
  30. 720
  31. 990
  32. 50
  33. 600
  34. 150
  35. 3
  36. 150
  37. 50
  38. 1190
  39. 300
  40. 340

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