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Why do curling stones curl? That is a question physicists are often asked,yet no answer has been established. Stones rotating clockwise curl right,contrary to our naive expectations. After a century of debate betweencontradicting hypotheses, this paper provides the answer based on experimentalevidence. A digital image analysis technique was used to perform precisionkinematic measurements of a curling stone's motion to identify the curlingmechanism. We observed a significant left-right asymmetric friction due tovelocity dependence on the friction constant. Combined with the discretepoint-like nature of the friction between ice and stone, swinging aroundslow-side friction points has been concluded as the dominant origin of thecurling. Many new angular momentum transfer phenomena have been found,supporting this conclusion.

Study of curling mechanism by precision kinematic measurements of curling stone's motion