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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 843 · 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 12 m long and rises 3 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  2. 2.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
  4. 4.🏋️ A force of 380 N pushes a cart 5 m along the floor. How much work is done, in joules?
  5. 5.🏋️ A machine lifts a load of 60 N when you push with 10 N. What is its mechanical advantage (MA)?
  6. 6.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
  7. 7.🏋️ A force of 310 N pushes a cart 2 m along the floor. How much work is done, in joules?
  8. 8.🏋️ A machine lifts a load of 680 N when you push with 170 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 290 N pushes a cart 4 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A force of 200 N pushes a cart 6 m along the floor. How much work is done, in joules?
  11. 11.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) no effort (d) less effort
  12. 12.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  13. 13.🏋️ A machine lifts a load of 480 N when you push with 160 N. What is its mechanical advantage (MA)?
  14. 14.🏋️ A force of 350 N pushes a cart 9 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
  16. 16.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) only on Mondays (d) yes, by half
  17. 17.🏋️ A force of 450 N pushes a cart 1 m along the floor. How much work is done, in joules?
  18. 18.🏋️ Pushing a crate 4 m took 160 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 40 N pushes a cart 2 m along the floor. How much work is done, in joules?
  20. 20.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ A force of 150 N did 1350 J of work. How many metres did the object move?
  22. 22.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  23. 23.🏋️ A 3 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.🏋️ A force of 390 N pushes a cart 2 m along the floor. How much work is done, in joules?
  25. 25.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
  26. 26.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
  27. 27.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 700 N box up it, in newtons? (ideal ramp, no friction)
  28. 28.🏋️ Pushing a crate 5 m took 950 J of work. What force was used, in newtons?
  29. 29.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
  30. 30.🏋️ A force of 360 N did 3240 J of work. How many metres did the object move?
  31. 31.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, 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 200 N did 1600 J of work. How many metres did the object move?
  34. 34.🏋️ A force of 120 N did 960 J of work. How many metres did the object move?
  35. 35.🏋️ A force of 170 N pushes a cart 1 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A machine lifts a load of 60 N when you push with 30 N. What is its mechanical advantage (MA)?
  37. 37.🏋️ A force of 140 N did 700 J of work. How many metres did the object move?
  38. 38.🏋️ A force of 450 N did 900 J of work. How many metres did the object move?
  39. 39.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4250 N box up it, in newtons? (ideal ramp, no friction)
  40. 40.🏋️ 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?

Answer key

  1. 450
  2. 5
  3. through a distance
  4. 1900
  5. 6
  6. joule (J)
  7. 620
  8. 4
  9. 1160
  10. 1200
  11. less effort
  12. 450
  13. 3
  14. 3150
  15. 3
  16. no, work stays the same
  17. 450
  18. 40
  19. 80
  20. 270
  21. 9
  22. 300
  23. 30
  24. 780
  25. 4
  26. 300
  27. 350
  28. 190
  29. 4
  30. 9
  31. 700
  32. load ÷ effort
  33. 8
  34. 8
  35. 170
  36. 2
  37. 5
  38. 2
  39. 850
  40. 120

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