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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 345 · 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 force of 10 N pushes a cart 5 m along the floor. How much work is done, in joules?
  2. 2.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) watt hour (d) metre (m)
  3. 3.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ 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?
  5. 5.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A force of 80 N did 640 J of work. How many metres did the object move?
  7. 7.🏋️ Pushing a crate 9 m took 2340 J of work. What force was used, in newtons?
  8. 8.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
  9. 9.🏋️ Pushing a crate 2 m took 80 J of work. What force was used, in newtons?
  10. 10.🏋️ Pushing a crate 4 m took 1040 J of work. What force was used, in newtons?
  11. 11.🏋️ A force of 100 N did 900 J of work. How many metres did the object move?
  12. 12.🏋️ Pushing a crate 9 m took 3510 J of work. What force was used, in newtons?
  13. 13.🏋️ A force of 160 N did 1120 J of work. How many metres did the object move?
  14. 14.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3200 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A force of 310 N pushes a cart 2 m along the floor. How much work is done, in joules?
  16. 16.🏋️ A machine lifts a load of 540 N when you push with 90 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A force of 350 N pushes a cart 1 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Pushing a crate 7 m took 2730 J of work. What force was used, in newtons?
  19. 19.🏋️ Pushing a crate 3 m took 150 J of work. What force was used, in newtons?
  20. 20.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
  22. 22.🏋️ A 3 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 smooth ramp is 2 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1600 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A force of 460 N pushes a cart 9 m along the floor. How much work is done, in joules?
  27. 27.🏋️ Pushing a crate 10 m took 1400 J of work. What force was used, in newtons?
  28. 28.🏋️ A force of 360 N pushes a cart 7 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 30 N did 90 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 210 N did 840 J of work. How many metres did the object move?
  31. 31.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  32. 32.🏋️ Pushing a crate 2 m took 860 J of work. What force was used, in newtons?
  33. 33.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ Pushing a crate 5 m took 2450 J of work. What force was used, in newtons?
  35. 35.🏋️ Pushing a crate 2 m took 960 J of work. What force was used, in newtons?
  36. 36.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ 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?
  40. 40.🏋️ A 15 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 50
  2. joule (J)
  3. 6
  4. 50
  5. 280
  6. 8
  7. 260
  8. no, work stays the same
  9. 40
  10. 260
  11. 9
  12. 390
  13. 7
  14. 800
  15. 620
  16. 6
  17. 350
  18. 390
  19. 50
  20. 3
  21. 2
  22. 30
  23. 900
  24. 50
  25. 400
  26. 4140
  27. 140
  28. 2520
  29. 3
  30. 4
  31. through a distance
  32. 430
  33. 40
  34. 490
  35. 480
  36. 4
  37. 6
  38. 2
  39. 150
  40. 600

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