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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 18 · 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 force of 140 N pushes a cart 7 m along the floor. How much work is done, in joules?
  2. 2.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) less effort (d) the same effort
  3. 3.🏋️ A force of 180 N pushes a cart 9 m along the floor. How much work is done, in joules?
  4. 4.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) only on Mondays (c) no, work stays the same (d) yes, by half
  5. 5.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ A force of 390 N pushes a cart 2 m along the floor. How much work is done, in joules?
  7. 7.🏋️ A force of 300 N did 1800 J of work. How many metres did the object move?
  8. 8.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  9. 9.🏋️ A force of 120 N pushes a cart 3 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A force of 160 N pushes a cart 7 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A machine lifts a load of 900 N when you push with 150 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
  15. 15.🏋️ A machine lifts a load of 200 N when you push with 40 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ 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?
  17. 17.🏋️ A force of 450 N did 4500 J of work. How many metres did the object move?
  18. 18.🏋️ A force of 470 N did 4230 J of work. How many metres did the object move?
  19. 19.🏋️ A force of 400 N pushes a cart 1 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 110 N pushes a cart 9 m along the floor. How much work is done, in joules?
  21. 21.🏋️ 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?
  22. 22.🏋️ Pushing a crate 5 m took 750 J of work. What force was used, in newtons?
  23. 23.🏋️ Pushing a crate 10 m took 3200 J of work. What force was used, in newtons?
  24. 24.🏋️ 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?
  25. 25.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) effort ÷ load (d) load ÷ effort
  26. 26.🏋️ Pushing a crate 4 m took 600 J of work. What force was used, in newtons?
  27. 27.🏋️ A machine lifts a load of 220 N when you push with 110 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ A force of 180 N pushes a cart 4 m along the floor. How much work is done, in joules?
  29. 29.🏋️ 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?
  30. 30.🏋️ Pushing a crate 3 m took 1410 J of work. What force was used, in newtons?
  31. 31.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A force of 160 N did 1600 J of work. How many metres did the object move?
  33. 33.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  34. 34.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A force of 250 N pushes a cart 6 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ Pushing a crate 6 m took 540 J of work. What force was used, in newtons?
  38. 38.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  39. 39.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A force of 190 N pushes a cart 7 m along the floor. How much work is done, in joules?

Answer key

  1. 980
  2. less effort
  3. 1620
  4. no, work stays the same
  5. 2
  6. 780
  7. 6
  8. joule (J)
  9. 360
  10. 1120
  11. 3
  12. 250
  13. 6
  14. 450
  15. 5
  16. 160
  17. 10
  18. 9
  19. 400
  20. 990
  21. 400
  22. 150
  23. 320
  24. 20
  25. load ÷ effort
  26. 150
  27. 2
  28. 720
  29. 600
  30. 470
  31. 3
  32. 10
  33. 250
  34. 700
  35. 1500
  36. 50
  37. 90
  38. 150
  39. 6
  40. 1330

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