Following a discussion on the internet was the following text.
The question was:
the downhill putt is harder than the uphill putt?
After am still not yet come in with Dave Pelz, I've been searching for my physics papers, and what shall I say nothing, absolutely nothing about golf, and certainly not for downhill putt. So much of the practical teaching German schools. In the standard work on biomechanics, biomechanics for not biomechanics "now is the following:
- have now the same forces acting on at athletic moves are typically different directions. Size and direction of the resultant, ie the impact on that body are not readily identifiable. The method to construct the resultant is, however, understand simple: we have then the two vectors (F1 and F2) to just draw a parallelogram. The diagonal of the parallelogram is the resultant.
If F1 stronger acting Downhill force and F2 to the lower lateral force, the Fr is, the product of these two forces. Of course, results from the lateral forces acting a gradient, but this is lower in the relation, see graph. Which is evident when F1 away would leave. Then only does F2. If we now add a third force, namely the Puttschlag (F3, which is now made in relation to the previously determined force vector Fr), who, let's assume in the direction as F1 goes, a clear predominance arises from forces and the lateral forces lose again to influence the ball 
therefore be assumed that the downhill putt is directionally stable and less is left to short.
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