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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 760 · 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 4 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A force of 170 N did 510 J of work. How many metres did the object move?
  3. 3.🏋️ A force of 290 N pushes a cart 1 m along the floor. How much work is done, in joules?
  4. 4.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
  5. 5.🏋️ A force of 120 N pushes a cart 7 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A machine lifts a load of 700 N when you push with 140 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A force of 330 N did 3300 J of work. How many metres did the object move?
  8. 8.🏋️ A force of 170 N did 1700 J of work. How many metres did the object move?
  9. 9.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it
  10. 10.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
  11. 11.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 500 N pushes a cart 3 m along the floor. How much work is done, in joules?
  13. 13.🏋️ 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)
  14. 14.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) the same effort (d) more effort
  15. 15.🏋️ A 10 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A force of 40 N pushes a cart 7 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A force of 270 N pushes a cart 7 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Pushing a crate 6 m took 360 J of work. What force was used, in newtons?
  19. 19.🏋️ A 7 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  20. 20.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
  21. 21.🏋️ A force of 160 N pushes a cart 3 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A force of 180 N did 720 J of work. How many metres did the object move?
  24. 24.🏋️ A force of 50 N did 150 J of work. How many metres did the object move?
  25. 25.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
  26. 26.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ 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?
  28. 28.🏋️ A force of 450 N did 900 J of work. How many metres did the object move?
  29. 29.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ A force of 150 N pushes a cart 7 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A force of 290 N did 580 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 5 m took 950 J of work. What force was used, in newtons?
  34. 34.🏋️ Pushing a crate 4 m took 600 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 340 N did 680 J of work. How many metres did the object move?
  36. 36.🏋️ Pushing a crate 3 m took 1410 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 480 N pushes a cart 10 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 410 N did 2870 J of work. How many metres did the object move?
  39. 39.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?

Answer key

  1. 250
  2. 3
  3. 290
  4. joule (J)
  5. 840
  6. 5
  7. 10
  8. 10
  9. through a distance
  10. load ÷ effort
  11. 800
  12. 1500
  13. 250
  14. less effort
  15. 200
  16. 280
  17. 1890
  18. 60
  19. 210
  20. no, work stays the same
  21. 480
  22. 750
  23. 4
  24. 3
  25. 150
  26. 90
  27. 10
  28. 2
  29. 190
  30. 1050
  31. 250
  32. 2
  33. 190
  34. 150
  35. 2
  36. 470
  37. 4800
  38. 7
  39. 360
  40. 2

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