I need a new video to analyze for a talk I am giving at the Southeastern Section of APS this week. My kids really like this commercial, so I will use it. (I am skipping to the part I will use where a guy jumps out of a window):
Ok, here we go. Is that guy jumping out of the window fake or real? Hello Tracker Video Analysis. If I assume a typical 1.7 meter human, this is the vertical motion of the dude.
Not too bad. This says the guy has a constant vertical acceleration of about -13 m/s2 (of course, my scale could just be off). So, no problems here. What about the horizontal motion? Note, there is a problem with the motion not being perpendicular to the camera. However, the camera angle is constant so I can at least look at this motion.
I am not happy. This shows a constant velocity in the horizontal direction. What is wrong with you Burger King Commercial people? Why are you doing this to me? I wanted an example of a video that was fake, but you have not fallen for either of the two common errors (constant vertical acceleration and constant horizontal velocity). Oh, but I will find a problem. Let me look at the landing part of the jump.
So, while landing, the guy has an upward acceleration of about 24 m/s2. Is this ok? Well, I have looked at dangerous jumps before (with all the physics of jumping and landing). That acceleration should be ok.
Fine. I give up. This just must be real. No wait. Here is the proof.
See. It says "Do not attempt". It doesn't say this is a stunt man, do not attempt. There you go. Fake.
