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    • Thread Starter

    Two questions about a syringe

    If a syringe is pushed such that the end is completley down and then the tip is covered
    1) Why, when pulled back, does the pulley part of the syringe try to move forward
    2) Why is it hard to pull the syring back when the end is covered?

    by the "pulley" part i assume you mean the piston part.

    Think about the pressure of the gas in the syringe. When you pull it back you are creating a partial vacuum. If atmospheric pressure is greater the there will be a resultant force pushing the piston back in.
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