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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 850 · 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.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
  2. 2.🏋️ Pushing a crate 8 m took 2400 J of work. What force was used, in newtons?
  3. 3.🏋️ A force of 200 N pushes a cart 7 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A 10 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ Pushing a crate 4 m took 1400 J of work. What force was used, in newtons?
  6. 6.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ 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)
  8. 8.🏋️ 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
  9. 9.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 280 N pushes a cart 1 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 500 N pushes a cart 10 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Pushing a crate 7 m took 70 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 170 N pushes a cart 7 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 10 N pushes a cart 9 m along the floor. How much work is done, in joules?
  17. 17.🏋️ Pushing a crate 7 m took 1890 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 190 N pushes a cart 3 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 350 N pushes a cart 3 m along the floor. How much work is done, in joules?
  20. 20.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  21. 21.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 100 N did 500 J of work. How many metres did the object move?
  23. 23.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A force of 340 N did 680 J of work. How many metres did the object move?
  25. 25.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ A force of 220 N did 1760 J of work. How many metres did the object move?
  27. 27.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
  28. 28.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A force of 380 N did 380 J of work. How many metres did the object move?
  30. 30.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ Pushing a crate 5 m took 650 J of work. What force was used, in newtons?
  32. 32.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 310 N pushes a cart 2 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 130 N pushes a cart 9 m along the floor. How much work is done, in joules?
  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 smooth ramp is 12 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ Pushing a crate 2 m took 860 J of work. What force was used, in newtons?

Answer key

  1. through a distance
  2. 300
  3. 1400
  4. 500
  5. 350
  6. 6
  7. 450
  8. no, work stays the same
  9. 2
  10. 280
  11. 3
  12. 5000
  13. 10
  14. 1190
  15. 3
  16. 90
  17. 270
  18. 570
  19. 1050
  20. joule (J)
  21. 140
  22. 5
  23. 100
  24. 2
  25. 280
  26. 8
  27. less effort
  28. 200
  29. 1
  30. 3
  31. 130
  32. 40
  33. 4
  34. 620
  35. 1170
  36. 6
  37. 150
  38. 640
  39. 6
  40. 430

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