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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 372 · 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 360 N when you push with 60 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ A force of 250 N did 500 J of work. How many metres did the object move?
  3. 3.🏋️ A force of 70 N pushes a cart 2 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A force of 120 N pushes a cart 2 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A force of 400 N did 2400 J of work. How many metres did the object move?
  6. 6.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) no, work stays the same (d) only on Mondays
  7. 7.🏋️ A force of 140 N pushes a cart 6 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A force of 90 N pushes a cart 7 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A force of 250 N did 2250 J of work. How many metres did the object move?
  10. 10.🏋️ A force of 50 N pushes a cart 9 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
  12. 12.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A machine lifts a load of 260 N when you push with 130 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A force of 220 N did 220 J of work. How many metres did the object move?
  15. 15.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load ÷ effort (d) load × effort
  16. 16.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  17. 17.🏋️ A force of 180 N pushes a cart 3 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A 13 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  19. 19.🏋️ A force of 200 N pushes a cart 3 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  22. 22.🏋️ A force of 230 N did 2070 J of work. How many metres did the object move?
  23. 23.🏋️ A force of 400 N pushes a cart 10 m along the floor. How much work is done, in joules?
  24. 24.🏋️ Pushing a crate 6 m took 120 J of work. What force was used, in newtons?
  25. 25.🏋️ A force of 260 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ Pushing a crate 6 m took 2280 J of work. What force was used, in newtons?
  27. 27.🏋️ 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?
  28. 28.🏋️ A force of 340 N pushes a cart 10 m along the floor. How much work is done, in joules?
  29. 29.🏋️ A force of 30 N did 150 J of work. How many metres did the object move?
  30. 30.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
  31. 31.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
  33. 33.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ Pushing a crate 3 m took 960 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 450 N pushes a cart 7 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A machine lifts a load of 300 N when you push with 50 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A force of 480 N pushes a cart 5 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 6
  2. 2
  3. 140
  4. 240
  5. 6
  6. no, work stays the same
  7. 840
  8. 630
  9. 9
  10. 450
  11. less effort
  12. 900
  13. 2
  14. 1
  15. load ÷ effort
  16. 400
  17. 540
  18. 520
  19. 600
  20. 2
  21. 120
  22. 9
  23. 4000
  24. 20
  25. 520
  26. 380
  27. 220
  28. 3400
  29. 5
  30. 2
  31. 2
  32. joule (J)
  33. 3
  34. 320
  35. 3150
  36. 2
  37. 6
  38. 2400
  39. 3
  40. 1000

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