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Unread 06-02-2012, 02:13
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wireties wireties is offline
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AKA: Keith Buchanan
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Re: Top/bottom roller shooter vs. bottom roller only

Quote:
Originally Posted by Ether View Post
Think about the tire of a car going down the highway at 60mph.

At any instant in time, the center of the tire is translating at 60 mph. The bottom of the tire, touching the ground, has zero speed at that instant. The top of the tire, at that instant in time, is going 120mph.
But our "car" is not moving. The speed on the edge is r * omega where omega is rps * 2 * pi. If there is a second wheel above the first why would it increase the speed on the edge of either wheel? Perhaps the real issue is that single-wheeled shooters lose velocity because of the balls interaction with the hood? And double-wheeled shooters (which generally have no hood) do not?

Jeez - I should have paid more attention in physics but I don't get it. How could you possibly accelerate the ball to an initial speed greater than the speed on the edge? Happen to know any illustrative web sites?

TIA
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