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Homework Help: Basic Force Concepts

  1. May 15, 2007 #1
    1. The problem statement, all variables and given/known data
    An an electric field.
    An electron is held stationairy in a vacuum between two charges metal plates.
    It is attracted to the positive plate since unlike charges attract. The weight of the electron balannces the electric force.

    Now these two forces are balanced. Acceleration is 0 ms^-2
    That would also mean the electron is moving with constant velocity. But if thats true, how could the electron be held stationairy?
  2. jcsd
  3. May 15, 2007 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    You've made an erroneous leap there. Zero acceleration does not imply non-zero velocity. Consider yourself sat in your chair in front of your computer. Are you accelerating? Do you have a non-zero velocity?

    Edit: Okay, Doc Al put it simpler than me :blushing:
    Last edited: May 15, 2007
  4. May 15, 2007 #3

    Doc Al

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    Staff: Mentor

    Not moving is a perfectly fine example of constant velocity! :wink: (The velocity is zero.)
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