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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 329 · 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) joule (J) (c) newton (N) (d) metre (m)
  2. 2.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
  4. 4.🏋️ 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?
  5. 5.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 5000 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 330 N pushes a cart 8 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ Pushing a crate 2 m took 960 J of work. What force was used, in newtons?
  9. 9.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  10. 10.🏋️ A force of 410 N did 2050 J of work. How many metres did the object move?
  11. 11.🏋️ A force of 130 N pushes a cart 1 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 130 N did 1170 J of work. How many metres did the object move?
  13. 13.🏋️ A 1 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A machine lifts a load of 440 N when you push with 110 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A force of 500 N pushes a cart 5 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 330 N pushes a cart 2 m along the floor. How much work is done, in joules?
  21. 21.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, always (d) yes, by half
  22. 22.🏋️ Pushing a crate 9 m took 3150 J of work. What force was used, in newtons?
  23. 23.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
  25. 25.🏋️ A force of 220 N pushes a cart 3 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) the same effort (d) more effort
  27. 27.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 400 N pushes a cart 2 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A force of 430 N pushes a cart 7 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A force of 170 N pushes a cart 10 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A force of 390 N pushes a cart 7 m along the floor. How much work is done, in joules?
  34. 34.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  35. 35.🏋️ 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)
  36. 36.🏋️ A force of 60 N pushes a cart 3 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A force of 460 N pushes a cart 4 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 50 N pushes a cart 2 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A force of 100 N pushes a cart 8 m along the floor. How much work is done, in joules?

Answer key

  1. joule (J)
  2. 1000
  3. load ÷ effort
  4. 280
  5. 1000
  6. 2640
  7. 750
  8. 480
  9. 2
  10. 5
  11. 130
  12. 9
  13. 40
  14. 1000
  15. 200
  16. 4
  17. 50
  18. 2500
  19. 250
  20. 660
  21. no, work stays the same
  22. 350
  23. 300
  24. through a distance
  25. 660
  26. less effort
  27. 3
  28. 800
  29. 3
  30. 3010
  31. 1700
  32. 250
  33. 2730
  34. 550
  35. 550
  36. 180
  37. 1840
  38. 100
  39. 750
  40. 800

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