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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 399 · 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.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
  2. 2.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2800 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A machine lifts a load of 950 N when you push with 190 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
  8. 8.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
  10. 10.🏋️ A 10 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  11. 11.🏋️ A force of 490 N did 1470 J of work. How many metres did the object move?
  12. 12.🏋️ A force of 380 N pushes a cart 2 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A force of 220 N pushes a cart 4 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A 2 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.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) no, work stays the same (c) only on Mondays (d) yes, always
  16. 16.🏋️ A force of 10 N pushes a cart 4 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ 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?
  20. 20.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4250 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A force of 300 N pushes a cart 8 m along the floor. How much work is done, in joules?
  22. 22.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) newton (N) (d) watt hour
  23. 23.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
  25. 25.🏋️ 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?
  26. 26.🏋️ A force of 400 N did 1200 J of work. How many metres did the object move?
  27. 27.🏋️ A force of 350 N pushes a cart 2 m along the floor. How much work is done, in joules?
  28. 28.🏋️ A force of 220 N pushes a cart 3 m along the floor. How much work is done, in joules?
  29. 29.🏋️ Pushing a crate 4 m took 800 J of work. What force was used, in newtons?
  30. 30.🏋️ A force of 390 N did 1170 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 100 N pushes a cart 6 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A force of 30 N did 60 J of work. How many metres did the object move?
  33. 33.🏋️ Pushing a crate 9 m took 630 J of work. What force was used, in newtons?
  34. 34.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  36. 36.🏋️ A force of 250 N pushes a cart 1 m along the floor. How much work is done, in joules?
  37. 37.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A 3 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.🏋️ Pushing a crate 3 m took 1440 J of work. What force was used, in newtons?

Answer key

  1. load ÷ effort
  2. 160
  3. 5
  4. 700
  5. 200
  6. 5
  7. 3
  8. 2
  9. less effort
  10. 100
  11. 3
  12. 760
  13. 880
  14. 80
  15. no, work stays the same
  16. 40
  17. 350
  18. 1000
  19. 360
  20. 850
  21. 2400
  22. joule (J)
  23. 250
  24. through a distance
  25. 280
  26. 3
  27. 700
  28. 660
  29. 200
  30. 3
  31. 600
  32. 2
  33. 70
  34. 600
  35. 320
  36. 250
  37. 400
  38. 5
  39. 90
  40. 480

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