## Tuesday, September 19, 2017

... well, more like your physics INTUITION on what should happen next.

It seems that Amazon has file a patent application that uses a physics engine to generate scenarios to see if you are a real person or a bot.

The company has filed a patent application for a new CAPTCHA method which would show you a 3D simulation of something about to happen to a person or object. That something would involve Newtonian physics — perhaps an item is about to fall on someone, or a ball is about to roll down a slope. The test would then show you several "after" scenarios and, if you pick the correct option, you've passed the test.
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The idea is that, because you are a human, you have an "intuitive" understanding of what would happen next in these scenarios. But computers need much more information about the scene and "might be unable to solve the test", according to the application.

Definitely interesting, although in Fig. 3B shown in the article, both Fig (A) and Fig (B) might be possible depending on the ambiguity of the drawing.

But this brings me an important point that I've been telling my students in intro physics classes when they dealt with mechanics. We all ALREADY KNOW many of the things that will happen in cases like this. We do not need to learn physics or to be enrolled in a physics class to know the qualitative description of the dynamics of these systems. So we are not teaching you about something you are not familiar with.

What a formal physics lesson will do is to describe these things more accurately, i.e. in a QUANTITATIVE manner. We won't simply say "Oh, the ball will roll down that inclined plane." Rather, we will describe the motion of the ball mathematically, and we will be able to say how long the ball will take to each the bottom, at what speed, etc...etc. In other words, we don't just say "What goes up must come down", but we will also say "When and where it will come down". This is what separates physics (and science) from hand-waving, everyday conversation.

All of us already have an intuitive understanding of the physical systems around us. That's why Amazon can make such a CAPTCHA test for everyone. A physics lessons simply formalize that understanding in a more accurate and non-ambiguous fashion.

Zz.