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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 883 · 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 270 N when you push with 90 N. What is its mechanical advantage (MA)?
  2. 2.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
  3. 3.🏋️ 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?
  4. 4.🏋️ A force of 470 N pushes a cart 9 m along the floor. How much work is done, in joules?
  5. 5.🏋️ 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)
  6. 6.🏋️ Pushing a crate 3 m took 810 J of work. What force was used, in newtons?
  7. 7.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
  8. 8.🏋️ A force of 10 N did 60 J of work. How many metres did the object move?
  9. 9.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ A force of 230 N did 1610 J of work. How many metres did the object move?
  11. 11.🏋️ A force of 400 N did 400 J of work. How many metres did the object move?
  12. 12.🏋️ 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)
  13. 13.🏋️ A force of 40 N pushes a cart 5 m along the floor. How much work is done, in joules?
  14. 14.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) only on Mondays (c) yes, always (d) yes, by half
  17. 17.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
  18. 18.🏋️ 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?
  19. 19.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
  20. 20.🏋️ A machine lifts a load of 280 N when you push with 140 N. What is its mechanical advantage (MA)?
  21. 21.🏋️ 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)
  22. 22.🏋️ A 7 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ 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?
  24. 24.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  25. 25.🏋️ 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?
  26. 26.🏋️ A force of 350 N pushes a cart 4 m along the floor. How much work is done, in joules?
  27. 27.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
  28. 28.🏋️ Pushing a crate 5 m took 100 J of work. What force was used, in newtons?
  29. 29.🏋️ A 16 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ A force of 170 N did 680 J of work. How many metres did the object move?
  31. 31.🏋️ A force of 200 N pushes a cart 1 m along the floor. How much work is done, in joules?
  32. 32.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) load + effort (d) effort ÷ load
  33. 33.🏋️ A force of 180 N pushes a cart 8 m along the floor. How much work is done, in joules?
  34. 34.🏋️ A force of 30 N did 90 J of work. How many metres did the object move?
  35. 35.🏋️ Pushing a crate 2 m took 760 J of work. What force was used, in newtons?
  36. 36.🏋️ Pushing a crate 2 m took 300 J of work. What force was used, in newtons?
  37. 37.🏋️ A force of 290 N pushes a cart 10 m along the floor. How much work is done, in joules?
  38. 38.🏋️ A force of 420 N pushes a cart 8 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 30 N. What is its mechanical advantage (MA)?
  40. 40.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)

Answer key

  1. 3
  2. through a distance
  3. 250
  4. 4230
  5. 250
  6. 270
  7. joule (J)
  8. 6
  9. 340
  10. 7
  11. 1
  12. 650
  13. 200
  14. 300
  15. 700
  16. no, work stays the same
  17. less effort
  18. 80
  19. 1000
  20. 2
  21. 250
  22. 350
  23. 170
  24. 550
  25. 60
  26. 1400
  27. 6
  28. 20
  29. 480
  30. 4
  31. 200
  32. load ÷ effort
  33. 1440
  34. 3
  35. 380
  36. 150
  37. 2900
  38. 3360
  39. 4
  40. 400

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