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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 863 · 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 3 m long and rises 1 m. What effort pushes a 1650 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
  3. 3.🏋️ A machine lifts a load of 560 N when you push with 140 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ A force of 90 N did 90 J of work. How many metres did the object move?
  5. 5.🏋️ A force of 480 N pushes a cart 1 m along the floor. How much work is done, in joules?
  6. 6.🏋️ Pushing a crate 9 m took 3690 J of work. What force was used, in newtons?
  7. 7.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
  8. 8.🏋️ A force of 230 N pushes a cart 3 m along the floor. How much work is done, in joules?
  9. 9.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) effort ÷ load (c) load × effort (d) load + effort
  10. 10.🏋️ Pushing a crate 2 m took 260 J of work. What force was used, in newtons?
  11. 11.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1050 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A force of 70 N did 700 J of work. How many metres did the object move?
  13. 13.🏋️ A machine lifts a load of 240 N when you push with 60 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ Pushing a crate 3 m took 1290 J of work. What force was used, in newtons?
  15. 15.🏋️ A force of 230 N did 920 J of work. How many metres did the object move?
  16. 16.🏋️ A force of 150 N pushes a cart 7 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A force of 460 N pushes a cart 9 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 400 N pushes a cart 10 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 250 N did 1250 J of work. How many metres did the object move?
  20. 20.🏋️ A machine lifts a load of 20 N when you push with 10 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ 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?
  22. 22.🏋️ A force of 160 N did 320 J of work. How many metres did the object move?
  23. 23.🏋️ A 7 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 2600 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ Pushing a crate 2 m took 100 J of work. What force was used, in newtons?
  27. 27.🏋️ A force of 500 N did 3500 J of work. How many metres did the object move?
  28. 28.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
  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.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) no, work stays the same (d) only on Mondays
  31. 31.🏋️ A force of 260 N did 1820 J of work. How many metres did the object move?
  32. 32.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ 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?
  34. 34.🏋️ A machine lifts a load of 540 N when you push with 180 N. What is its mechanical advantage (MA)?
  35. 35.🏋️ A force of 300 N pushes a cart 5 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3400 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ A force of 270 N pushes a cart 6 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A force of 210 N pushes a cart 6 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 600 N when you push with 200 N. What is its mechanical advantage (MA)?

Answer key

  1. 550
  2. through a distance
  3. 4
  4. 1
  5. 480
  6. 410
  7. joule (J)
  8. 690
  9. load ÷ effort
  10. 130
  11. 350
  12. 10
  13. 4
  14. 430
  15. 4
  16. 1050
  17. 4140
  18. 4000
  19. 5
  20. 2
  21. 60
  22. 2
  23. 210
  24. 650
  25. 2
  26. 50
  27. 7
  28. less effort
  29. 600
  30. no, work stays the same
  31. 7
  32. 4
  33. 320
  34. 3
  35. 1500
  36. 850
  37. 250
  38. 1620
  39. 1260
  40. 3

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