07 March 2010
Is it real, or is it fake?
It's obviously "just" a commercial for a product, so the knee-jerk response is to assume that this is either achieved by computer graphics or by the use of a glass-top table with the cloth under the glass etc. etc. But could it be real? Would the fabric tolerate the acceleration without ripping?
Found at Physics Buzz.
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It's fake. The trick is based on the difference between static and dynamic friction, and minimizing the time that the items touch the moving cloth. All of the items actually move, but the trick is to minimize the move. If the items don't move at all, it is fake.
ReplyDeleteIn this case, there are several problems:
1. you can see that it looks fake.
2. the motorcycle does not accelerate that fast that it would have a nice jerk only a few feet from the table. It *might* be possible with a small table if the motorcyle had slack in the rope, so that it had time to get to 60 mph before the rope went taut; that would really jerk. Dynamic friction is quite a bit less, but you have to have a nice jerk to transition from static to dynamic friction. If that transition is too long, everything drops to the floor.
3. the items on the left end of the table have to have ~hundred feet of fabric running underneath them, and in the video they don't move at all. if the video was real, the items would shift (slightly) proportional to the amount of time they are in contact with the moving fabric.
But clearly, everything in the video jiggles as if it were cut n pasted out of a video still, with zero net motion between the items.
Totally.
ReplyDeleteIt's still real to me, damn it!
ReplyDeleteFakie fake fakers... the worst part is the fake excitement at the end of the fake stunt.
ReplyDelete