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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 299 · 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 12 m long and rises 3 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  3. 3.🏋️ Pushing a crate 5 m took 600 J of work. What force was used, in newtons?
  4. 4.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  5. 5.🏋️ A force of 20 N did 180 J of work. How many metres did the object move?
  6. 6.🏋️ A force of 10 N pushes a cart 10 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A force of 460 N did 1380 J of work. How many metres did the object move?
  9. 9.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load + effort (d) load × effort
  10. 10.🏋️ Pushing a crate 10 m took 3100 J of work. What force was used, in newtons?
  11. 11.🏋️ 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?
  12. 12.🏋️ Pushing a crate 3 m took 240 J of work. What force was used, in newtons?
  13. 13.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A force of 240 N did 1440 J of work. How many metres did the object move?
  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 smooth ramp is 5 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  18. 18.🏋️ A force of 400 N pushes a cart 6 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 50 N pushes a cart 7 m along the floor. How much work is done, in joules?
  20. 20.🏋️ 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?
  21. 21.🏋️ Pushing a crate 7 m took 1540 J of work. What force was used, in newtons?
  22. 22.🏋️ A force of 110 N pushes a cart 10 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A force of 110 N pushes a cart 7 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 5 m took 850 J of work. What force was used, in newtons?
  25. 25.🏋️ A force of 90 N did 720 J of work. How many metres did the object move?
  26. 26.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Pushing a crate 8 m took 3280 J of work. What force was used, in newtons?
  28. 28.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ Pushing a crate 6 m took 60 J of work. What force was used, in newtons?
  30. 30.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A force of 290 N did 1160 J of work. How many metres did the object move?
  32. 32.🏋️ A force of 400 N did 3600 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 8 m took 880 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 30 N did 300 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 80 N pushes a cart 1 m along the floor. How much work is done, in joules?
  36. 36.🏋️ Pushing a crate 10 m took 2000 J of work. What force was used, in newtons?
  37. 37.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A 13 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.🏋️ Pushing a crate 8 m took 560 J of work. What force was used, in newtons?

Answer key

  1. 550
  2. joule (J)
  3. 120
  4. through a distance
  5. 9
  6. 100
  7. 3
  8. 3
  9. load ÷ effort
  10. 310
  11. 600
  12. 80
  13. 250
  14. 6
  15. 620
  16. 600
  17. no, work stays the same
  18. 2400
  19. 350
  20. 720
  21. 220
  22. 1100
  23. 770
  24. 170
  25. 8
  26. 6
  27. 410
  28. 4
  29. 10
  30. 750
  31. 4
  32. 9
  33. 110
  34. 10
  35. 80
  36. 200
  37. 350
  38. 170
  39. 650
  40. 70

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