I am talking about high speed shots with the 2 OBs close or touching (within a couple of inches, so cloth friction is insignificant).mikepage said:I can think of two other causes (besides transferred spin) of the middle ball going forward. First is, as I said, topspin on the middle ball from friction with the cloth. Second is any inelasticity of collision between the two object balls would cause the middle ball to go forward.
I'm sceptical. I would think if it works to any practical degree for the backspin shot (to put follow on the middle ball), it should also work with the topspin shot (to put backspin on the middle ball). I haven't seen anthing that convinces me.
mike page
fargo
I am also contrasting stun to draw shots. With stun, the inelasticity of the collision allows the middle object ball to travel forward some. The draw can add significantly to this forwad motion by adding a component of topspin to the middle CB.
For a topspin shot to make the middle ball come backward of the tangent line, it would have to be greater that the forward component produced by the inelasticity of the OB to OB collision. It is likely of similar or slightly less magnitude though, so you won't see backward movement.
You can however easily test the draw converted to topspin effect by hitting a few straight shots on two touching balls. Hit some with stun and others with draw. See how far the middle ball travels forward with the two methods.