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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 524 · 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 machine lifts a load of 480 N when you push with 120 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A 13 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
  4. 4.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A force of 170 N did 850 J of work. How many metres did the object move?
  6. 6.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A longer ramp to the same height needs … (a) less effort (b) no effort (c) more effort (d) the same effort
  8. 8.🏋️ A force of 450 N pushes a cart 6 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  11. 11.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 10 N did 10 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 5 m took 2400 J of work. What force was used, in newtons?
  14. 14.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
  15. 15.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A force of 30 N pushes a cart 4 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A force of 470 N pushes a cart 9 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 470 N did 2820 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 170 N pushes a cart 10 m along the floor. How much work is done, in joules?
  20. 20.🏋️ Pushing a crate 1 m took 360 J of work. What force was used, in newtons?
  21. 21.🏋️ A force of 310 N pushes a cart 4 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 30 N did 90 J of work. How many metres did the object move?
  23. 23.🏋️ Pushing a crate 6 m took 300 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 440 N pushes a cart 10 m along the floor. How much work is done, in joules?
  25. 25.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
  26. 26.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A force of 130 N pushes a cart 8 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 a 900 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A force of 110 N pushes a cart 5 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Pushing a crate 8 m took 560 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 370 N pushes a cart 1 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ A force of 100 N pushes a cart 3 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 310 N pushes a cart 5 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 360 N did 2880 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 50 N pushes a cart 2 m along the floor. How much work is done, in joules?

Answer key

  1. 4
  2. 390
  3. no, work stays the same
  4. 6
  5. 5
  6. 80
  7. less effort
  8. 2700
  9. 150
  10. load ÷ effort
  11. 800
  12. 1
  13. 480
  14. through a distance
  15. 800
  16. 120
  17. 4230
  18. 6
  19. 1700
  20. 360
  21. 1240
  22. 3
  23. 50
  24. 4400
  25. joule (J)
  26. 450
  27. 600
  28. 500
  29. 1040
  30. 450
  31. 450
  32. 550
  33. 3
  34. 70
  35. 370
  36. 50
  37. 300
  38. 1550
  39. 8
  40. 100

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