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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 70 · 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 smooth ramp is 8 m long and rises 2 m. What effort pushes a 3800 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
  3. 3.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
  4. 4.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A force of 180 N did 1620 J of work. How many metres did the object move?
  6. 6.🏋️ A force of 280 N pushes a cart 7 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A 7 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ A 2 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.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
  10. 10.🏋️ 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)
  11. 11.🏋️ A force of 80 N did 320 J of work. How many metres did the object move?
  12. 12.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  13. 13.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  14. 14.🏋️ A force of 210 N pushes a cart 7 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) only upwards (d) very slowly
  17. 17.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A force of 250 N did 2250 J of work. How many metres did the object move?
  19. 19.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A force of 120 N did 720 J of work. How many metres did the object move?
  21. 21.🏋️ A force of 160 N pushes a cart 4 m along the floor. How much work is done, in joules?
  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 machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
  24. 24.🏋️ A machine lifts a load of 570 N when you push with 190 N. What is its mechanical advantage (MA)?
  25. 25.🏋️ A force of 240 N pushes a cart 4 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 4750 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
  28. 28.🏋️ A 3 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  29. 29.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  30. 30.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ Pushing a crate 8 m took 1200 J of work. What force was used, in newtons?
  32. 32.🏋️ A 14 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  33. 33.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 20 N did 200 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 300 N did 1500 J of work. How many metres did the object move?
  37. 37.🏋️ A 1 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.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ A force of 300 N pushes a cart 7 m along the floor. How much work is done, in joules?

Answer key

  1. 950
  2. no, work stays the same
  3. less effort
  4. 5
  5. 9
  6. 1960
  7. 70
  8. 100
  9. joule (J)
  10. 350
  11. 4
  12. 3
  13. 120
  14. 1470
  15. 1000
  16. through a distance
  17. 100
  18. 9
  19. 450
  20. 6
  21. 640
  22. 4
  23. 2
  24. 3
  25. 960
  26. 950
  27. load ÷ effort
  28. 60
  29. 300
  30. 700
  31. 150
  32. 420
  33. 240
  34. 5
  35. 10
  36. 5
  37. 20
  38. 1000
  39. 150
  40. 2100

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