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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 687 · 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 longer ramp to the same height needs … (a) no effort (b) less effort (c) the same effort (d) more effort
  2. 2.🏋️ An 8 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A force of 450 N did 450 J of work. How many metres did the object move?
  4. 4.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
  6. 6.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A 3 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Pushing a crate 7 m took 1190 J of work. What force was used, in newtons?
  10. 10.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 440 N pushes a cart 8 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A force of 240 N did 720 J of work. How many metres did the object move?
  14. 14.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A force of 130 N did 910 J of work. How many metres did the object move?
  16. 16.🏋️ 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?
  17. 17.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ Pushing a crate 5 m took 1150 J of work. What force was used, in newtons?
  19. 19.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A force of 260 N pushes a cart 4 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 480 N did 4800 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 140 N pushes a cart 5 m along the floor. How much work is done, in joules?
  24. 24.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  25. 25.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ 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?
  27. 27.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
  29. 29.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A force of 40 N pushes a cart 7 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 20 N pushes a cart 5 m along the floor. How much work is done, in joules?
  33. 33.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  34. 34.🏋️ A force of 90 N did 270 J of work. How many metres did the object move?
  35. 35.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  36. 36.🏋️ A force of 410 N pushes a cart 3 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A force of 50 N pushes a cart 4 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A force of 200 N pushes a cart 5 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 300 N did 2400 J of work. How many metres did the object move?

Answer key

  1. less effort
  2. 400
  3. 1
  4. 3
  5. no, work stays the same
  6. 150
  7. 150
  8. 250
  9. 170
  10. 900
  11. 400
  12. 3520
  13. 3
  14. 140
  15. 7
  16. 390
  17. 560
  18. 230
  19. 800
  20. 1040
  21. 6
  22. 10
  23. 700
  24. joule (J)
  25. 240
  26. 550
  27. 180
  28. load ÷ effort
  29. 2
  30. 4
  31. 280
  32. 100
  33. through a distance
  34. 3
  35. 100
  36. 1230
  37. 200
  38. 2
  39. 1000
  40. 8

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