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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 357 · 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 machine lifts a load of 150 N when you push with 30 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ Pushing a crate 2 m took 280 J of work. What force was used, in newtons?
  4. 4.🏋️ 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?
  5. 5.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A force of 50 N pushes a cart 3 m along the floor. How much work is done, in joules?
  7. 7.🏋️ Pushing a crate 2 m took 740 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 90 N did 450 J of work. How many metres did the object move?
  9. 9.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  10. 10.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2100 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?
  12. 12.🏋️ Pushing a crate 8 m took 800 J of work. What force was used, in newtons?
  13. 13.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  14. 14.🏋️ 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?
  15. 15.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 700 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  17. 17.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
  18. 18.🏋️ Pushing a crate 1 m took 340 J of work. What force was used, in newtons?
  19. 19.🏋️ Pushing a crate 8 m took 1600 J of work. What force was used, in newtons?
  20. 20.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  21. 21.🏋️ A machine lifts a load of 550 N when you push with 110 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A machine lifts a load of 120 N when you push with 30 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A force of 500 N pushes a cart 3 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4750 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ Pushing a crate 7 m took 3430 J of work. What force was used, in newtons?
  26. 26.🏋️ 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?
  27. 27.🏋️ A force of 440 N pushes a cart 3 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 2 m took 780 J of work. What force was used, in newtons?
  29. 29.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ 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?
  31. 31.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ Pushing a crate 2 m took 840 J of work. What force was used, in newtons?
  33. 33.🏋️ A force of 30 N pushes a cart 8 m along the floor. How much work is done, in joules?
  34. 34.🏋️ Pushing a crate 8 m took 3600 J of work. What force was used, in newtons?
  35. 35.🏋️ 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
  36. 36.🏋️ A force of 200 N did 2000 J of work. How many metres did the object move?
  37. 37.🏋️ 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)
  38. 38.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A force of 300 N pushes a cart 6 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A force of 230 N pushes a cart 8 m along the floor. How much work is done, in joules?

Answer key

  1. 5
  2. 5
  3. 140
  4. 350
  5. 850
  6. 150
  7. 370
  8. 5
  9. less effort
  10. 700
  11. 450
  12. 100
  13. through a distance
  14. 360
  15. 350
  16. 4
  17. joule (J)
  18. 340
  19. 200
  20. load ÷ effort
  21. 5
  22. 4
  23. 1500
  24. 950
  25. 490
  26. 200
  27. 1320
  28. 390
  29. 2
  30. 180
  31. 100
  32. 420
  33. 240
  34. 450
  35. no, work stays the same
  36. 10
  37. 50
  38. 5
  39. 1800
  40. 1840

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