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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 94 · 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) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
  2. 2.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ A 19 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  5. 5.🏋️ A force of 50 N pushes a cart 7 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
  7. 7.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) only on Mondays (d) yes, by half
  8. 8.🏋️ 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?
  9. 9.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  10. 10.🏋️ 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)
  11. 11.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 40 N did 240 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 5 m took 2000 J of work. What force was used, in newtons?
  14. 14.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
  15. 15.🏋️ Pushing a crate 2 m took 800 J of work. What force was used, in newtons?
  16. 16.🏋️ A force of 500 N pushes a cart 6 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1350 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A force of 140 N did 700 J of work. How many metres did the object move?
  20. 20.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ Pushing a crate 1 m took 70 J of work. What force was used, in newtons?
  22. 22.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ A force of 420 N pushes a cart 10 m along the floor. How much work is done, in joules?
  24. 24.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ A force of 50 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A machine lifts a load of 600 N when you push with 200 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ Pushing a crate 9 m took 4500 J of work. What force was used, in newtons?
  29. 29.🏋️ A force of 280 N pushes a cart 2 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 140 N pushes a cart 7 m along the floor. How much work is done, in joules?
  31. 31.🏋️ A force of 470 N pushes a cart 6 m along the floor. How much work is done, in joules?
  32. 32.🏋️ 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?
  33. 33.🏋️ A force of 490 N pushes a cart 10 m along the floor. How much work is done, in joules?
  34. 34.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
  35. 35.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ Pushing a crate 5 m took 1300 J of work. What force was used, in newtons?
  37. 37.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  38. 38.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ 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?
  40. 40.🏋️ A force of 380 N pushes a cart 6 m along the floor. How much work is done, in joules?

Answer key

  1. joule (J)
  2. 700
  3. 550
  4. 190
  5. 350
  6. less effort
  7. no, work stays the same
  8. 850
  9. 100
  10. 850
  11. 4
  12. 6
  13. 400
  14. through a distance
  15. 400
  16. 3000
  17. 450
  18. 850
  19. 5
  20. 600
  21. 70
  22. 5
  23. 4200
  24. 300
  25. 100
  26. 50
  27. 3
  28. 500
  29. 560
  30. 980
  31. 2820
  32. 170
  33. 4900
  34. load ÷ effort
  35. 4
  36. 260
  37. 280
  38. 240
  39. 360
  40. 2280

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