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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 813 · 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 2 kg box is lifted straight up by 4 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) through a distance (d) very slowly
  3. 3.🏋️ A machine lifts a load of 50 N when you push with 10 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  7. 7.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) effort ÷ load (d) load × effort
  8. 8.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A 5 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  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 smooth ramp is 15 m long and rises 3 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ A force of 130 N pushes a cart 3 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) joule (J) (d) newton (N)
  17. 17.🏋️ Pushing a crate 4 m took 440 J of work. What force was used, in newtons?
  18. 18.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ An 11 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.🏋️ A force of 170 N did 510 J of work. How many metres did the object move?
  21. 21.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) only on Mondays (d) yes, by half
  23. 23.🏋️ A force of 390 N did 780 J of work. How many metres did the object move?
  24. 24.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ Pushing a crate 2 m took 980 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 20 N did 20 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 220 N pushes a cart 10 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A force of 190 N did 190 J of work. How many metres did the object move?
  29. 29.🏋️ A force of 100 N did 800 J of work. How many metres did the object move?
  30. 30.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A force of 500 N did 2000 J of work. How many metres did the object move?
  32. 32.🏋️ An 8 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A force of 340 N pushes a cart 3 m along the floor. How much work is done, in joules?
  34. 34.🏋️ 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?
  35. 35.🏋️ A force of 20 N did 40 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 250 N did 1750 J of work. How many metres did the object move?
  37. 37.🏋️ A force of 90 N did 720 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 400 N pushes a cart 7 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 310 N pushes a cart 2 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 80
  2. through a distance
  3. 5
  4. 120
  5. 450
  6. less effort
  7. load ÷ effort
  8. 100
  9. 200
  10. 60
  11. 700
  12. 350
  13. 390
  14. 6
  15. 700
  16. joule (J)
  17. 110
  18. 550
  19. 330
  20. 3
  21. 900
  22. no, work stays the same
  23. 2
  24. 50
  25. 490
  26. 1
  27. 2200
  28. 1
  29. 8
  30. 70
  31. 4
  32. 320
  33. 1020
  34. 90
  35. 2
  36. 7
  37. 8
  38. 2800
  39. 620
  40. 550

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