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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 901 · 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 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ 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?
  3. 3.🏋️ A 2 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  4. 4.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
  5. 5.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
  8. 8.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  9. 9.🏋️ A force of 40 N did 40 J of work. How many metres did the object move?
  10. 10.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) newton (N) (d) watt hour
  11. 11.🏋️ An 11 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  12. 12.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) the same effort (d) no effort
  13. 13.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  16. 16.🏋️ Pushing a crate 7 m took 3290 J of work. What force was used, in newtons?
  17. 17.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  18. 18.🏋️ 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)
  19. 19.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A force of 60 N did 60 J of work. How many metres did the object move?
  21. 21.🏋️ A machine lifts a load of 760 N when you push with 190 N. What is its mechanical advantage (MA)?
  22. 22.🏋️ A force of 60 N did 300 J of work. How many metres did the object move?
  23. 23.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2250 N box up it, in newtons? (ideal ramp, no friction)
  24. 24.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
  25. 25.🏋️ A machine lifts a load of 600 N when you push with 200 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ A force of 310 N did 1860 J of work. How many metres did the object move?
  28. 28.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
  29. 29.🏋️ A force of 160 N pushes a cart 10 m along the floor. How much work is done, in joules?
  30. 30.🏋️ A force of 150 N pushes a cart 8 m along the floor. How much work is done, in joules?
  31. 31.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
  32. 32.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ A force of 130 N pushes a cart 7 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2500 N box up it, in newtons? (ideal ramp, no friction)
  35. 35.🏋️ A force of 30 N did 120 J of work. How many metres did the object move?
  36. 36.🏋️ A force of 180 N did 540 J of work. How many metres did the object move?
  37. 37.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
  38. 38.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  39. 39.🏋️ A force of 390 N pushes a cart 4 m along the floor. How much work is done, in joules?
  40. 40.🏋️ Pushing a crate 1 m took 210 J of work. What force was used, in newtons?

Answer key

  1. 3
  2. 20
  3. 20
  4. 1000
  5. 900
  6. 120
  7. no, work stays the same
  8. 750
  9. 1
  10. joule (J)
  11. 330
  12. less effort
  13. 2
  14. 6
  15. through a distance
  16. 470
  17. 40
  18. 700
  19. 900
  20. 1
  21. 4
  22. 5
  23. 750
  24. 300
  25. 3
  26. 6
  27. 6
  28. 750
  29. 1600
  30. 1200
  31. load ÷ effort
  32. 250
  33. 910
  34. 500
  35. 4
  36. 3
  37. 5
  38. 50
  39. 1560
  40. 210

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