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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 136 · 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.🏋️ 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?
  2. 2.🏋️ A force of 100 N did 1000 J of work. How many metres did the object move?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) only on Mondays (d) yes, always
  4. 4.🏋️ A force of 230 N pushes a cart 9 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A force of 20 N pushes a cart 5 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A 16 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A force of 110 N pushes a cart 2 m along the floor. How much work is done, in joules?
  8. 8.🏋️ 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?
  9. 9.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
  10. 10.🏋️ 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?
  11. 11.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 80 N did 640 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 210 N did 1680 J of work. How many metres did the object move?
  14. 14.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
  16. 16.🏋️ A force of 220 N did 880 J of work. How many metres did the object move?
  17. 17.🏋️ A force of 210 N did 1050 J of work. How many metres did the object move?
  18. 18.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
  19. 19.🏋️ A force of 280 N did 280 J of work. How many metres did the object move?
  20. 20.🏋️ A force of 20 N pushes a cart 3 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A force of 90 N pushes a cart 5 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 440 N did 4400 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 210 N did 210 J of work. How many metres did the object move?
  24. 24.🏋️ A machine lifts a load of 840 N when you push with 140 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A force of 460 N pushes a cart 5 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ Pushing a crate 3 m took 570 J of work. What force was used, in newtons?
  31. 31.🏋️ Pushing a crate 7 m took 1470 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 6 m took 420 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 410 N pushes a cart 2 m along the floor. How much work is done, in joules?
  34. 34.🏋️ Pushing a crate 3 m took 330 J of work. What force was used, in newtons?
  35. 35.🏋️ Pushing a crate 8 m took 1200 J of work. What force was used, in newtons?
  36. 36.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A 5 kg box is lifted straight up by 2 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 9 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A 17 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 240
  2. 10
  3. no, work stays the same
  4. 2070
  5. 100
  6. 480
  7. 220
  8. 170
  9. joule (J)
  10. 50
  11. 3
  12. 8
  13. 8
  14. 50
  15. through a distance
  16. 4
  17. 5
  18. less effort
  19. 1
  20. 60
  21. 450
  22. 10
  23. 1
  24. 6
  25. 6
  26. 2300
  27. 200
  28. 100
  29. 750
  30. 190
  31. 210
  32. 70
  33. 820
  34. 110
  35. 150
  36. 6
  37. 100
  38. 1530
  39. 510
  40. 300

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