What was the effort distance in the movable pulley you built?  What difficulties did you have to overcome to complete this assignment?  Answer in three to five complete sentences.
Your Answer:
The effort distance was 1 foot and 4 inches for the movable pulley. I had some difficulty in keeping the string moving while the pulley was operating. Sometimes I ran out of string and the pulley would only go so far. This is a really good example of mechanical advantage.


Question 3
8 / 8 pts
    The advantage of using a movable pulley over a fixed pulley is ___.



Correct!
  less required force
  shorter rope required
  more required force
  more stable apparatus
  less stable apparatus
  longer rope required

Question 4
8 / 8 pts
     If a movable pulley system is lifting 120 N, each support rope is lifting [answer] N.
Correct!

60
Correct Answers
60

Question 5
0 / 8 pts
     What is the added difficulty when combining the fixed and movable pulley?





  less maneuverability
  complicated rigging
  more expensive
You Answered
  more force required
Correct Answer
  more friction
  more support needed

Question 6
0 / 8 pts
     One man has been hired to clean the rubble out of a narrow mine shaft in which a section has collapsed from the rotten timber.  The shaft he has to work in is long and narrow, but its timber has been replaced and is sturdy.  Which simple machine would be the most efficient to help him accomplish this job?
Correct Answer
  combined fixed and movable pulley system
  wheel and axle
You Answered
  fixed pulley system
  inclined plane
  movable pulley system
  screw

Question 7
8 / 8 pts
     If a business was made up of ten large pickup trucks and the workers had to back them under a machine lifting bails of hay to be lowered into the truck bed,  which simple machine would be best for the job?
  screw
  wheel and axle
  movable pulley
  wedge
  inclined plane
Correct!
  fixed pulley

Question 8
Not yet graded / 12 pts
    Create a situation in which the fixed pulley would be a better option than a movable pulley and explain why.
Your Answer:
In the example mentioned before with the long mineshaft, you wouldn't need as much rope with the fixed pulley than the movable pulley. This would pan out for better business and easier to make the job less costly.


Question 9
Not yet graded / 12 pts
     Create a situation in which the movable pulley would be a good solution to moving the load.
Your Answer:
Lifting heavier objects would be an easier situation for a movable pulley rather than a fixed pulley. Since less force is required because of the shortened friction and the weight it distributed throughout the different pulleys, it would make it easier to lift heavier objects than a fixed pulley could.


Question 10
Not yet graded / 12 pts
      Think of a situation in which the combination of a  fixed and movable pulley would work well.
Your Answer:
Fishing nets would make good use of the combination of pulleys because you have more strength in your longer and thicker ropes. This would also allow heavier loads to be pulled up with the sacrifice of some extra force exerted.