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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 735 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Pushing a crate 4 m took 720 J of work. What force was used, in newtons?
  3. 3.🏋️ Pushing a crate 4 m took 80 J of work. What force was used, in newtons?
  4. 4.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
  5. 5.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  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 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)
  8. 8.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1950 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ Pushing a crate 10 m took 900 J of work. What force was used, in newtons?
  11. 11.🏋️ A longer ramp to the same height needs … (a) less effort (b) the same effort (c) more effort (d) no effort
  12. 12.🏋️ A force of 100 N pushes a cart 9 m along the floor. How much work is done, in joules?
  13. 13.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
  14. 14.🏋️ Pushing a crate 10 m took 2700 J of work. What force was used, in newtons?
  15. 15.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
  16. 16.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A force of 240 N pushes a cart 1 m along the floor. How much work is done, in joules?
  19. 19.🏋️ Pushing a crate 6 m took 120 J of work. What force was used, in newtons?
  20. 20.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ Pushing a crate 10 m took 100 J of work. What force was used, in newtons?
  22. 22.🏋️ Pushing a crate 4 m took 480 J of work. What force was used, in newtons?
  23. 23.🏋️ A force of 450 N pushes a cart 4 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 5 m took 100 J of work. What force was used, in newtons?
  25. 25.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 3900 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A force of 320 N pushes a cart 8 m along the floor. How much work is done, in joules?
  27. 27.🏋️ Pushing a crate 3 m took 240 J of work. What force was used, in newtons?
  28. 28.🏋️ 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?
  29. 29.🏋️ A force of 310 N did 3100 J of work. How many metres did the object move?
  30. 30.🏋️ A force of 80 N did 720 J of work. How many metres did the object move?
  31. 31.🏋️ Pushing a crate 3 m took 1200 J of work. What force was used, in newtons?
  32. 32.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  34. 34.🏋️ A force of 160 N pushes a cart 5 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 280 N did 560 J of work. How many metres did the object move?
  36. 36.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A force of 240 N pushes a cart 2 m along the floor. How much work is done, in joules?
  38. 38.🏋️ Pushing a crate 2 m took 160 J of work. What force was used, in newtons?
  39. 39.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A force of 40 N pushes a cart 1 m along the floor. How much work is done, in joules?

Answer key

  1. 950
  2. 180
  3. 20
  4. joule (J)
  5. through a distance
  6. 150
  7. 900
  8. 650
  9. 300
  10. 90
  11. less effort
  12. 900
  13. no, work stays the same
  14. 270
  15. load ÷ effort
  16. 4
  17. 3
  18. 240
  19. 20
  20. 150
  21. 10
  22. 120
  23. 1800
  24. 20
  25. 650
  26. 2560
  27. 80
  28. 600
  29. 10
  30. 9
  31. 400
  32. 5
  33. 250
  34. 800
  35. 2
  36. 850
  37. 480
  38. 80
  39. 100
  40. 40

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