Geometry of the Circle

[BerntR]

2-C-1#3 is a tiny draw.

The ball takes on a side spin that equals the RPM of the horizontal hinge. You can see the ball take on a spin in all thee drawings at page 17 in the 6th edition.

[3Putt]

2-C-1#3 is a tiny draw.

The ball takes on a side spin that equals the RPM of the horizontal hinge. You can see the ball take on a spin in all thee drawings at page 17 in the 6th edition.

Hey Bernt, is this really a true statement? When in contact with the clubface, every part of the ball is rotating at the RPM of the horizontal hinge (ie the ball is not spinning horizontally around its centre of gravity). Once the ball separates from the clubface, there is no more force causing the ball to accelerate to the center of the hinge so every part of the ball will assume a straight line motion, tangential to the circle that it was moving on when in contact with the clubface. The outermost point on the ball will have more speed than the innermost point on the ball so there may be some adjustment until a steady state is achieved but I don't see how that can turn into a sustained horizontal spin.

You appear to be wise in the ways of physics. If you can explain the mechanism, I'd appreciate it. Thanks

3putt