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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 195 · 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.🏋️ 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 longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
  3. 3.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
  4. 4.🏋️ 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?
  5. 5.🏋️ A force of 50 N pushes a cart 8 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A force of 80 N pushes a cart 3 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ Pushing a crate 3 m took 750 J of work. What force was used, in newtons?
  9. 9.🏋️ Pushing a crate 10 m took 3200 J of work. What force was used, in newtons?
  10. 10.🏋️ A 7 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 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ Pushing a crate 4 m took 680 J of work. What force was used, in newtons?
  13. 13.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ Pushing a crate 9 m took 1620 J of work. What force was used, in newtons?
  15. 15.🏋️ A force of 470 N pushes a cart 3 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
  18. 18.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
  19. 19.🏋️ A force of 230 N pushes a cart 4 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 100 N did 500 J of work. How many metres did the object move?
  21. 21.🏋️ A 12 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.🏋️ Pushing a crate 9 m took 3060 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 280 N pushes a cart 10 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  25. 25.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A force of 60 N pushes a cart 8 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, by half (d) yes, always
  29. 29.🏋️ Pushing a crate 1 m took 340 J of work. What force was used, in newtons?
  30. 30.🏋️ A force of 380 N did 1140 J of work. How many metres did the object move?
  31. 31.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A force of 350 N pushes a cart 7 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 40 N did 360 J of work. How many metres did the object move?
  35. 35.🏋️ 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?
  36. 36.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 350 N did 2100 J of work. How many metres did the object move?
  38. 38.🏋️ Pushing a crate 5 m took 250 J of work. What force was used, in newtons?
  39. 39.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?

Answer key

  1. 240
  2. less effort
  3. load ÷ effort
  4. 170
  5. 400
  6. 240
  7. 2
  8. 250
  9. 320
  10. 70
  11. 360
  12. 170
  13. 750
  14. 180
  15. 1410
  16. 4
  17. joule (J)
  18. 4
  19. 920
  20. 5
  21. 120
  22. 340
  23. 2800
  24. through a distance
  25. 2
  26. 900
  27. 480
  28. no, work stays the same
  29. 340
  30. 3
  31. 3
  32. 2
  33. 2450
  34. 9
  35. 280
  36. 550
  37. 6
  38. 50
  39. 300
  40. 4

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