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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 959 · 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.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  2. 2.🏋️ Pushing a crate 3 m took 60 J of work. What force was used, in newtons?
  3. 3.🏋️ 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)
  4. 4.🏋️ A force of 360 N pushes a cart 6 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A 6 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  6. 6.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) the same effort (d) more effort
  7. 7.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A force of 300 N pushes a cart 3 m along the floor. How much work is done, in joules?
  9. 9.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
  10. 10.🏋️ A 10 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 5100 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  13. 13.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
  14. 14.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  15. 15.🏋️ A machine lifts a load of 510 N when you push with 170 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  19. 19.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  20. 20.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  22. 22.🏋️ A force of 20 N pushes a cart 10 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A 17 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A force of 110 N pushes a cart 5 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 3 m took 270 J of work. What force was used, in newtons?
  27. 27.🏋️ Pushing a crate 6 m took 1080 J of work. What force was used, in newtons?
  28. 28.🏋️ Pushing a crate 6 m took 2400 J of work. What force was used, in newtons?
  29. 29.🏋️ Pushing a crate 3 m took 870 J of work. What force was used, in newtons?
  30. 30.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A 12 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ 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?
  36. 36.🏋️ A force of 280 N did 2800 J of work. How many metres did the object move?
  37. 37.🏋️ A force of 310 N pushes a cart 5 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 30 N did 180 J of work. How many metres did the object move?
  39. 39.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ Pushing a crate 3 m took 1260 J of work. What force was used, in newtons?

Answer key

  1. joule (J)
  2. 20
  3. 50
  4. 2160
  5. 180
  6. less effort
  7. 360
  8. 900
  9. 450
  10. 200
  11. 850
  12. 80
  13. through a distance
  14. no, work stays the same
  15. 3
  16. 50
  17. 3
  18. load ÷ effort
  19. 6
  20. 600
  21. 450
  22. 200
  23. 900
  24. 850
  25. 550
  26. 90
  27. 180
  28. 400
  29. 290
  30. 200
  31. 3
  32. 6
  33. 360
  34. 500
  35. 70
  36. 10
  37. 1550
  38. 6
  39. 3
  40. 420

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