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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 521 · 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 longer ramp to the same height needs … (a) no effort (b) less effort (c) more effort (d) the same effort
  2. 2.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
  3. 3.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
  4. 4.🏋️ 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?
  5. 5.🏋️ A force of 250 N pushes a cart 2 m along the floor. How much work is done, in joules?
  6. 6.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ A 15 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  8. 8.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
  9. 9.🏋️ A force of 380 N pushes a cart 3 m along the floor. How much work is done, in joules?
  10. 10.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) only on Mondays (c) yes, always (d) no, work stays the same
  11. 11.🏋️ A 13 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.🏋️ Pushing a crate 2 m took 40 J of work. What force was used, in newtons?
  13. 13.🏋️ 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)
  14. 14.🏋️ A machine lifts a load of 140 N when you push with 70 N. What is its mechanical advantage (MA)?
  15. 15.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes an 800 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 3300 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A machine lifts a load of 300 N when you push with 150 N. What is its mechanical advantage (MA)?
  18. 18.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
  19. 19.🏋️ A force of 450 N pushes a cart 1 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A force of 120 N pushes a cart 3 m along the floor. How much work is done, in joules?
  21. 21.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
  22. 22.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A force of 330 N did 990 J of work. How many metres did the object move?
  24. 24.🏋️ Pushing a crate 3 m took 960 J of work. What force was used, in newtons?
  25. 25.🏋️ A 7 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  26. 26.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  27. 27.🏋️ Pushing a crate 5 m took 2250 J of work. What force was used, in newtons?
  28. 28.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A force of 330 N did 1650 J of work. How many metres did the object move?
  30. 30.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A machine lifts a load of 960 N when you push with 160 N. What is its mechanical advantage (MA)?
  32. 32.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  33. 33.🏋️ Pushing a crate 8 m took 880 J of work. What force was used, in newtons?
  34. 34.🏋️ A force of 30 N did 270 J of work. How many metres did the object move?
  35. 35.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
  36. 36.🏋️ A force of 40 N pushes a cart 2 m along the floor. How much work is done, in joules?
  37. 37.🏋️ Pushing a crate 8 m took 3200 J of work. What force was used, in newtons?
  38. 38.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A force of 210 N pushes a cart 6 m along the floor. How much work is done, in joules?
  40. 40.🏋️ Pushing a crate 1 m took 450 J of work. What force was used, in newtons?

Answer key

  1. less effort
  2. 1000
  3. joule (J)
  4. 320
  5. 500
  6. 100
  7. 150
  8. load ÷ effort
  9. 1140
  10. no, work stays the same
  11. 390
  12. 20
  13. 250
  14. 2
  15. 200
  16. 550
  17. 2
  18. 150
  19. 450
  20. 360
  21. through a distance
  22. 250
  23. 3
  24. 320
  25. 280
  26. 2
  27. 450
  28. 4
  29. 5
  30. 440
  31. 6
  32. 150
  33. 110
  34. 9
  35. 2
  36. 80
  37. 400
  38. 2
  39. 1260
  40. 450

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