Bwog reader and Punny Physicist Steve Ma sent in this sign found in Pupin:
Somewhere, in his non-relativistic afterlife, Newton is smiling.
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Bwog Staff on
Nov 16, 2009 
13 Comments
Bwog reader and Punny Physicist Steve Ma sent in this sign found in Pupin:
Somewhere, in his non-relativistic afterlife, Newton is smiling.
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13 Comments
@Mike Wouldn’t it actually more precisely be torque because the door is on a hinge and it would be circular motion?
@anonymous i <3 you, steve ma!!!!
@The Force This is not the blue button you are looking for.
@The Issue The electronic door opener should’ve been designed to handle forces resulting from a manual door opening in the first place.
@i would second that.
@to posters 1-3 1) Learn some physics, #1. You are completely wrong.
2) None of these comments were funny.
@2012 steve ma is possibly the cutest asian boy i have ever seen.
@uhhh... …. *facepalm*
@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”
@uhhh why so serious?