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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 465 · 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 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)
  2. 2.🏋️ A force of 440 N did 880 J of work. How many metres did the object move?
  3. 3.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) yes, always (d) only on Mondays
  5. 5.🏋️ Pushing a crate 5 m took 350 J of work. What force was used, in newtons?
  6. 6.🏋️ 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?
  7. 7.🏋️ Pushing a crate 5 m took 500 J of work. What force was used, in newtons?
  8. 8.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Pushing a crate 8 m took 1680 J of work. What force was used, in newtons?
  10. 10.🏋️ 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?
  11. 11.🏋️ A force of 170 N pushes a cart 1 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A force of 130 N did 390 J of work. How many metres did the object move?
  15. 15.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 290 N pushes a cart 7 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 320 N pushes a cart 5 m along the floor. How much work is done, in joules?
  19. 19.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
  20. 20.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A force of 450 N did 450 J of work. How many metres did the object move?
  22. 22.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load
  23. 23.🏋️ A force of 430 N did 1290 J of work. How many metres did the object move?
  24. 24.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ Pushing a crate 10 m took 1000 J of work. What force was used, in newtons?
  26. 26.🏋️ A machine lifts a load of 660 N when you push with 110 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Pushing a crate 7 m took 210 J of work. What force was used, in newtons?
  28. 28.🏋️ Pushing a crate 7 m took 140 J of work. What force was used, in newtons?
  29. 29.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
  30. 30.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 20 N did 100 J of work. How many metres did the object move?
  33. 33.🏋️ A force of 230 N did 1840 J of work. How many metres did the object move?
  34. 34.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 400 N did 2400 J of work. How many metres did the object move?
  36. 36.🏋️ A machine lifts a load of 500 N when you push with 100 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 320 N did 3200 J of work. How many metres did the object move?
  38. 38.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ Pushing a crate 9 m took 3780 J of work. What force was used, in newtons?
  40. 40.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it

Answer key

  1. 600
  2. 2
  3. 400
  4. no, work stays the same
  5. 70
  6. 100
  7. 100
  8. 150
  9. 210
  10. 60
  11. 170
  12. 800
  13. 950
  14. 3
  15. 120
  16. 20
  17. 2030
  18. 1600
  19. joule (J)
  20. 6
  21. 1
  22. load ÷ effort
  23. 3
  24. 2
  25. 100
  26. 6
  27. 30
  28. 20
  29. less effort
  30. 400
  31. 2
  32. 5
  33. 8
  34. 5
  35. 6
  36. 5
  37. 10
  38. 800
  39. 420
  40. through a distance

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