Nov

16

13 Comments

  1. um  

    inaccurate. some things don't have mass or acceleration but still can apply a force (e.g. F = qE). Though we can easily take the mass and acceleration of one's hand using F=ma to get this, we could have also induced this force using something akin to the reverse piezoelectric effect, where an electric field causes mechanical work. in any case, the sign should probably not have been changed, as people will now find ways to apply forces on that poor blue button, such as with massless energetic particles like photons.

    • hmmm.....  

      I would argue that the door or blue button is not reflective enough to be affected by radiation pressure if flooded by photons, and that the energies required of photons to exert significant force may instead dissociate the atoms. Also, other forces such as the electrostatic force will require the door or button to be charged (hence the q in F=qE), and will in any case require a ridiculous large electric field. Thus, the best way to open the door would be to exert a simple push or pull with your hand, which the vandalizer nicely sums up in a way that Newton would be proud of.

      • ah, but  

        but what if we increased the pressure of the elevator so greatly that the force per area on the button were enough to counteract the force of the spring behind the button? this would surely be another option. Clearly, Newton would not be happy by the vandal's activity.

        • hmmm.....  

          Did you not read what I wrote before responding?

          "I would argue that the door or blue button is not reflective enough to be affected by radiation pressure if flooded by photons, and that the energies required of photons to exert significant force may instead dissociate the atoms"

  2. uhhh...  

    .... *facepalm*

  3. 2012  

    steve ma is possibly the cutest asian boy i have ever seen.

  4. to posters 1-3  

    1) Learn some physics, #1. You are completely wrong.
    2) None of these comments were funny.

  5. The Issue  

    The electronic door opener should've been designed to handle forces resulting from a manual door opening in the first place.

  6. The Force  

    This is not the blue button you are looking for.

  7. anonymous  

    i <3 you, steve ma!!!!

  8. Mike  

    Wouldn't it actually more precisely be torque because the door is on a hinge and it would be circular motion?

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