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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 339 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) only on Mondays (d) yes, by half
  2. 2.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A force of 500 N did 2000 J of work. How many metres did the object move?
  4. 4.🏋️ A force of 290 N did 290 J of work. How many metres did the object move?
  5. 5.🏋️ A force of 480 N did 3840 J of work. How many metres did the object move?
  6. 6.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  8. 8.🏋️ A force of 110 N pushes a cart 3 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A force of 210 N did 210 J of work. How many metres did the object move?
  10. 10.🏋️ Pushing a crate 2 m took 860 J of work. What force was used, in newtons?
  11. 11.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
  12. 12.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
  15. 15.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ Pushing a crate 9 m took 3240 J of work. What force was used, in newtons?
  17. 17.🏋️ A force of 80 N pushes a cart 9 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
  21. 21.🏋️ A force of 170 N pushes a cart 6 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 440 N pushes a cart 2 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ An 8 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A force of 50 N did 100 J of work. How many metres did the object move?
  26. 26.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 270 N pushes a cart 3 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 310 N did 930 J of work. How many metres did the object move?
  32. 32.🏋️ A 9 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 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 500 N pushes a cart 5 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A force of 10 N did 50 J of work. How many metres did the object move?
  37. 37.🏋️ A force of 340 N did 2720 J of work. How many metres did the object move?
  38. 38.🏋️ 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?
  39. 39.🏋️ A force of 280 N pushes a cart 7 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1750 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. no, work stays the same
  2. 600
  3. 4
  4. 1
  5. 8
  6. 3
  7. joule (J)
  8. 330
  9. 1
  10. 430
  11. through a distance
  12. 250
  13. 900
  14. less effort
  15. 4
  16. 360
  17. 720
  18. 5
  19. 2
  20. load ÷ effort
  21. 1020
  22. 880
  23. 2
  24. 320
  25. 2
  26. 40
  27. 810
  28. 450
  29. 400
  30. 600
  31. 3
  32. 90
  33. 20
  34. 2500
  35. 5
  36. 5
  37. 8
  38. 160
  39. 1960
  40. 350

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