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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 668 · 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.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
  2. 2.🏋️ A force of 280 N pushes a cart 3 m along the floor. How much work is done, in joules?
  3. 3.🏋️ A force of 180 N did 1080 J of work. How many metres did the object move?
  4. 4.🏋️ A force of 400 N did 3200 J of work. How many metres did the object move?
  5. 5.🏋️ 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?
  6. 6.🏋️ Pushing a crate 7 m took 420 J of work. What force was used, in newtons?
  7. 7.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A force of 90 N pushes a cart 9 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
  11. 11.🏋️ 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?
  12. 12.🏋️ A 6 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.🏋️ A 13 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ A force of 400 N did 2000 J of work. How many metres did the object move?
  15. 15.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  17. 17.🏋️ Pushing a crate 3 m took 840 J of work. What force was used, in newtons?
  18. 18.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) less effort (d) the same effort
  19. 19.🏋️ A force of 30 N did 90 J of work. How many metres did the object move?
  20. 20.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 130 N pushes a cart 8 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A force of 350 N did 1750 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 410 N did 410 J of work. How many metres did the object move?
  26. 26.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 420 N did 840 J of work. How many metres did the object move?
  28. 28.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  29. 29.🏋️ A force of 230 N did 1380 J of work. How many metres did the object move?
  30. 30.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 460 N pushes a cart 2 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 330 N pushes a cart 1 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A force of 40 N pushes a cart 9 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A force of 220 N pushes a cart 3 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 450 N pushes a cart 10 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 320 N pushes a cart 1 m along the floor. How much work is done, in joules?
  39. 39.🏋️ 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?
  40. 40.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. joule (J)
  2. 840
  3. 6
  4. 8
  5. 600
  6. 60
  7. 450
  8. 810
  9. 180
  10. no, work stays the same
  11. 100
  12. 60
  13. 650
  14. 5
  15. 6
  16. through a distance
  17. 280
  18. less effort
  19. 3
  20. 50
  21. 3
  22. 1040
  23. 3
  24. 5
  25. 1
  26. 750
  27. 2
  28. load ÷ effort
  29. 6
  30. 200
  31. 920
  32. 330
  33. 360
  34. 50
  35. 660
  36. 900
  37. 4500
  38. 320
  39. 160
  40. 500

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