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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 557 · 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 smooth ramp is 2 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ 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?
  3. 3.🏋️ A force of 120 N pushes a cart 6 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  5. 5.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
  6. 6.🏋️ A force of 380 N did 1900 J of work. How many metres did the object move?
  7. 7.🏋️ Pushing a crate 4 m took 1840 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 420 N did 4200 J of work. How many metres did the object move?
  9. 9.🏋️ A machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 320 N pushes a cart 1 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ 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?
  13. 13.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
  14. 14.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  15. 15.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ 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?
  19. 19.🏋️ A force of 270 N did 1620 J of work. How many metres did the object move?
  20. 20.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
  22. 22.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A force of 130 N did 130 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 400 N did 400 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
  26. 26.🏋️ A force of 120 N did 480 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 310 N pushes a cart 4 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 8 m took 2160 J of work. What force was used, in newtons?
  29. 29.🏋️ A machine lifts a load of 380 N when you push with 190 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ An 8 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 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)
  32. 32.🏋️ 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?
  33. 33.🏋️ A force of 210 N pushes a cart 7 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A force of 280 N did 2240 J of work. How many metres did the object move?
  37. 37.🏋️ Pushing a crate 8 m took 3520 J of work. What force was used, in newtons?
  38. 38.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A force of 230 N did 1150 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 40 N did 120 J of work. How many metres did the object move?

Answer key

  1. 100
  2. 150
  3. 720
  4. less effort
  5. no, work stays the same
  6. 5
  7. 460
  8. 10
  9. 4
  10. 320
  11. 5
  12. 50
  13. through a distance
  14. joule (J)
  15. 2
  16. 700
  17. 2
  18. 350
  19. 6
  20. 5
  21. load ÷ effort
  22. 570
  23. 1
  24. 1
  25. 3
  26. 4
  27. 1240
  28. 270
  29. 2
  30. 160
  31. 550
  32. 360
  33. 1470
  34. 160
  35. 4
  36. 8
  37. 440
  38. 300
  39. 5
  40. 3

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