Disadvantages and Advantages of pulleys
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Two advantages are you can pull up , uses only half of the effort force of a fixed pulley
A disadvantage is very difficult to build!
An advantage is that you only need half of the effort force of a fixed pulley.
A disadvantage is you have to pull up.
An advantage is you can pull down which is easier than pulling up.
The disadvantage is you have to use the same amount of force as if you were not using a pulley.