How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon.
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Simple rings | small cabochon | stone no holes | irregular shape stone | How to do 599Main wire = number of round x circumference of ring + 5cm ( 2 inch ) - wire bending = 10cm ( 4 inch ) * With this ring model you can use a variety of stone shapes (can be applied to irregular ...
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