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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 772 · 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 5 m long and rises 1 m. What effort pushes a 3000 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) no, work stays the same (d) yes, always
  3. 3.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
  4. 4.🏋️ A force of 440 N pushes a cart 5 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 3900 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
  7. 7.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  8. 8.🏋️ An 8 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  9. 9.🏋️ Pushing a crate 1 m took 270 J of work. What force was used, in newtons?
  10. 10.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
  11. 11.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  12. 12.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A force of 410 N did 1230 J of work. How many metres did the object move?
  14. 14.🏋️ A 16 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  15. 15.🏋️ A force of 340 N pushes a cart 1 m along the floor. How much work is done, in joules?
  16. 16.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
  17. 17.🏋️ A force of 20 N pushes a cart 8 m along the floor. How much work is done, in joules?
  18. 18.🏋️ A force of 140 N did 420 J of work. How many metres did the object move?
  19. 19.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
  21. 21.🏋️ A force of 20 N did 180 J of work. How many metres did the object move?
  22. 22.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
  23. 23.🏋️ Pushing a crate 6 m took 540 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 180 N did 1620 J of work. How many metres did the object move?
  25. 25.🏋️ A force of 70 N pushes a cart 2 m along the floor. How much work is done, in joules?
  26. 26.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  28. 28.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
  29. 29.🏋️ A force of 300 N did 1800 J of work. How many metres did the object move?
  30. 30.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3250 N box up it, in newtons? (ideal ramp, no friction)
  31. 31.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  32. 32.🏋️ Pushing a crate 4 m took 640 J of work. What force was used, in newtons?
  33. 33.🏋️ Pushing a crate 3 m took 420 J of work. What force was used, in newtons?
  34. 34.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load ÷ effort (d) load + effort
  35. 35.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  37. 37.🏋️ 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?
  38. 38.🏋️ A force of 140 N pushes a cart 1 m along the floor. How much work is done, in joules?
  39. 39.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Answer key

  1. 600
  2. no, work stays the same
  3. 900
  4. 2200
  5. 650
  6. 5
  7. 300
  8. 160
  9. 270
  10. through a distance
  11. 400
  12. 700
  13. 3
  14. 160
  15. 340
  16. joule (J)
  17. 160
  18. 3
  19. 250
  20. 50
  21. 9
  22. 6
  23. 90
  24. 9
  25. 140
  26. 300
  27. 80
  28. less effort
  29. 6
  30. 650
  31. 200
  32. 160
  33. 140
  34. load ÷ effort
  35. 4
  36. 170
  37. 20
  38. 140
  39. 2
  40. 80

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