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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 163 · 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 300 N pushes a cart 7 m along the floor. How much work is done, in joules?
  2. 2.🏋️ Pushing a crate 9 m took 1440 J of work. What force was used, in newtons?
  3. 3.🏋️ A force of 230 N did 1610 J of work. How many metres did the object move?
  4. 4.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
  6. 6.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A force of 80 N did 720 J of work. How many metres did the object move?
  9. 9.🏋️ A force of 130 N pushes a cart 6 m along the floor. How much work is done, in joules?
  10. 10.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) newton (N) (d) metre (m)
  11. 11.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 390 N did 1170 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 160 N pushes a cart 5 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
  15. 15.🏋️ 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?
  16. 16.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 160 N pushes a cart 10 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ 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?
  20. 20.🏋️ A force of 150 N did 450 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 30 N pushes a cart 4 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 60 N pushes a cart 8 m along the floor. How much work is done, in joules?
  23. 23.🏋️ An 18 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ Pushing a crate 8 m took 2400 J of work. What force was used, in newtons?
  25. 25.🏋️ Pushing a crate 7 m took 560 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 500 N pushes a cart 5 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A force of 30 N did 90 J of work. How many metres did the object move?
  28. 28.🏋️ Pushing a crate 5 m took 300 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 70 N pushes a cart 1 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  33. 33.🏋️ Pushing a crate 9 m took 2880 J of work. What force was used, in newtons?
  34. 34.🏋️ Pushing a crate 3 m took 900 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 130 N did 130 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 290 N did 2610 J of work. How many metres did the object move?
  37. 37.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A force of 50 N pushes a cart 1 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 420 N did 2520 J of work. How many metres did the object move?

Answer key

  1. 2100
  2. 160
  3. 7
  4. 700
  5. no, work stays the same
  6. 4
  7. 900
  8. 9
  9. 780
  10. joule (J)
  11. 400
  12. 3
  13. 800
  14. less effort
  15. 170
  16. 480
  17. 1600
  18. 6
  19. 350
  20. 3
  21. 120
  22. 480
  23. 180
  24. 300
  25. 80
  26. 2500
  27. 3
  28. 60
  29. 70
  30. 400
  31. 100
  32. through a distance
  33. 320
  34. 300
  35. 1
  36. 9
  37. 6
  38. 50
  39. 3
  40. 6

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