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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 240 · 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 720 N when you push with 180 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
  3. 3.🏋️ A force of 410 N pushes a cart 2 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A force of 490 N did 1960 J of work. How many metres did the object move?
  5. 5.🏋️ 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?
  6. 6.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
  7. 7.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A 1 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.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
  10. 10.🏋️ A machine lifts a load of 950 N when you push with 190 N. What is its mechanical advantage (MA)?
  11. 11.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 20 N did 160 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 3 m took 810 J of work. What force was used, in newtons?
  14. 14.🏋️ Pushing a crate 6 m took 480 J of work. What force was used, in newtons?
  15. 15.🏋️ A machine lifts a load of 1020 N when you push with 170 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
  17. 17.🏋️ A force of 390 N did 3900 J of work. How many metres did the object move?
  18. 18.🏋️ A force of 380 N pushes a cart 9 m along the floor. How much work is done, in joules?
  19. 19.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) yes, by half (d) no, work stays the same
  20. 20.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A force of 300 N pushes a cart 4 m along the floor. How much work is done, in joules?
  22. 22.🏋️ A force of 410 N pushes a cart 10 m along the floor. How much work is done, in joules?
  23. 23.🏋️ A machine lifts a load of 30 N when you push with 10 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A force of 410 N pushes a cart 7 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  26. 26.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 290 N pushes a cart 1 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A 12 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) only upwards (d) through a distance
  32. 32.🏋️ A force of 250 N pushes a cart 8 m along the floor. How much work is done, in joules?
  33. 33.🏋️ A force of 210 N did 630 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 460 N did 3220 J of work. How many metres did the object move?
  35. 35.🏋️ A 5 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 smooth ramp is 2 m long and rises 1 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ 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)
  38. 38.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ Pushing a crate 5 m took 150 J of work. What force was used, in newtons?

Answer key

  1. 4
  2. joule (J)
  3. 820
  4. 4
  5. 850
  6. 3
  7. 3
  8. 50
  9. load ÷ effort
  10. 5
  11. 300
  12. 8
  13. 270
  14. 80
  15. 6
  16. less effort
  17. 10
  18. 3420
  19. no, work stays the same
  20. 450
  21. 1200
  22. 4100
  23. 3
  24. 2870
  25. 400
  26. 3
  27. 2
  28. 2
  29. 290
  30. 480
  31. through a distance
  32. 2000
  33. 3
  34. 7
  35. 50
  36. 550
  37. 550
  38. 340
  39. 220
  40. 30

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