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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 619 · 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 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
  3. 3.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 400 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ 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)
  7. 7.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
  8. 8.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
  12. 12.🏋️ A force of 440 N pushes a cart 2 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A force of 70 N pushes a cart 3 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A force of 80 N did 80 J of work. How many metres did the object move?
  19. 19.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
  20. 20.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  21. 21.🏋️ A force of 370 N pushes a cart 5 m along the floor. How much work is done, in joules?
  22. 22.🏋️ 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?
  23. 23.🏋️ A force of 460 N did 460 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A force of 500 N pushes a cart 7 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 440 N pushes a cart 1 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 210 N pushes a cart 1 m along the floor. How much work is done, in joules?
  30. 30.🏋️ Pushing a crate 8 m took 2640 J of work. What force was used, in newtons?
  31. 31.🏋️ Pushing a crate 3 m took 1230 J of work. What force was used, in newtons?
  32. 32.🏋️ Pushing a crate 2 m took 800 J of work. What force was used, in newtons?
  33. 33.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 260 N pushes a cart 3 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ 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?
  38. 38.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ Pushing a crate 4 m took 120 J of work. What force was used, in newtons?
  40. 40.🏋️ 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)

Answer key

  1. 1000
  2. through a distance
  3. 2
  4. 100
  5. 2
  6. 150
  7. less effort
  8. 10
  9. 50
  10. 3
  11. load ÷ effort
  12. 880
  13. 600
  14. 5
  15. 2
  16. 210
  17. 950
  18. 1
  19. joule (J)
  20. no, work stays the same
  21. 1850
  22. 60
  23. 1
  24. 2
  25. 250
  26. 3500
  27. 2
  28. 440
  29. 210
  30. 330
  31. 410
  32. 400
  33. 2
  34. 780
  35. 640
  36. 50
  37. 170
  38. 2
  39. 30
  40. 100

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