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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 939 · 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.🏋️ 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?
  2. 2.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
  4. 4.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A 17 kg box is lifted straight up by 4 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) the same effort (b) more effort (c) no effort (d) less effort
  7. 7.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  9. 9.🏋️ 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?
  10. 10.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
  11. 11.🏋️ A force of 470 N pushes a cart 6 m along the floor. How much work is done, in joules?
  12. 12.🏋️ A force of 70 N did 210 J of work. How many metres did the object move?
  13. 13.🏋️ A force of 450 N pushes a cart 3 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  16. 16.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ Pushing a crate 5 m took 1400 J of work. What force was used, in newtons?
  19. 19.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A machine lifts a load of 540 N when you push with 90 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 10 N pushes a cart 6 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ Pushing a crate 2 m took 20 J of work. What force was used, in newtons?
  26. 26.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  27. 27.🏋️ A force of 490 N pushes a cart 3 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A force of 190 N pushes a cart 5 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A machine lifts a load of 520 N when you push with 130 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A force of 410 N did 2460 J of work. How many metres did the object move?
  32. 32.🏋️ An 18 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 machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
  36. 36.🏋️ A force of 450 N pushes a cart 2 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A force of 330 N pushes a cart 2 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 60 N did 300 J of work. How many metres did the object move?
  40. 40.🏋️ A force of 300 N pushes a cart 8 m along the floor. How much work is done, in joules?

Answer key

  1. 720
  2. 700
  3. no, work stays the same
  4. 4
  5. 680
  6. less effort
  7. 300
  8. through a distance
  9. 600
  10. 850
  11. 2820
  12. 3
  13. 1350
  14. 3
  15. 450
  16. 550
  17. 600
  18. 280
  19. 550
  20. 2
  21. 6
  22. 60
  23. 5
  24. 4
  25. 10
  26. load ÷ effort
  27. 1470
  28. 950
  29. 4
  30. 5
  31. 6
  32. 180
  33. 3
  34. 400
  35. joule (J)
  36. 900
  37. 650
  38. 660
  39. 5
  40. 2400

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