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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 131 · 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 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  2. 2.🏋️ An 18 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A force of 220 N pushes a cart 5 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A force of 20 N did 120 J of work. How many metres did the object move?
  5. 5.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
  10. 10.🏋️ Pushing a crate 6 m took 660 J of work. What force was used, in newtons?
  11. 11.🏋️ 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)
  12. 12.🏋️ Pushing a crate 2 m took 860 J of work. What force was used, in newtons?
  13. 13.🏋️ In which unit is work measured? (a) joule (J) (b) newton (N) (c) watt hour (d) metre (m)
  14. 14.🏋️ A force of 230 N pushes a cart 6 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  17. 17.🏋️ Pushing a crate 9 m took 630 J of work. What force was used, in newtons?
  18. 18.🏋️ A force of 80 N did 800 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 350 N pushes a cart 3 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 380 N pushes a cart 1 m along the floor. How much work is done, in joules?
  21. 21.🏋️ A force of 330 N did 1650 J of work. How many metres did the object move?
  22. 22.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
  23. 23.🏋️ Pushing a crate 4 m took 1080 J of work. What force was used, in newtons?
  24. 24.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A force of 20 N did 20 J of work. How many metres did the object move?
  30. 30.🏋️ A 12 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 smooth ramp is 10 m long and rises 2 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ A force of 180 N did 720 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 6 m took 1200 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 30 N did 150 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 90 N did 180 J of work. How many metres did the object move?
  36. 36.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2850 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 280 N pushes a cart 7 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 250 N did 2000 J of work. How many metres did the object move?
  39. 39.🏋️ Pushing a crate 7 m took 3010 J of work. What force was used, in newtons?
  40. 40.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 150
  2. 720
  3. 1100
  4. 6
  5. 2
  6. 150
  7. 500
  8. 750
  9. no, work stays the same
  10. 110
  11. 250
  12. 430
  13. joule (J)
  14. 1380
  15. 700
  16. through a distance
  17. 70
  18. 10
  19. 1050
  20. 380
  21. 5
  22. load ÷ effort
  23. 270
  24. 4
  25. 850
  26. 570
  27. 550
  28. 800
  29. 1
  30. 120
  31. 250
  32. 4
  33. 200
  34. 5
  35. 2
  36. 950
  37. 1960
  38. 8
  39. 430
  40. 200

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