Figure 5
From: A surface topography analysis of the curling stone curl mechanism
Top: The color map shows the angle between the front-most and the rear-most speed vectors as a function of the rotational speed of the contact annulus and the translational speed of the center of mass of the stone; this quantity is taken to be a proxy of SAD. A typical relation between the longitudinal and rotational speeds (data obtained from ref.11) is superimposed. Middle: Typical SAD-time relation and typical transverse velocity-time relation (data obtained from ref.11), indicating that some correlation between the curl and SAD exists. Bottom: Comparison of the time integral of SAD and the transverse velocity, showing that the two are linearly proportional [as predicted by Eq. (2)] up to sliding time of roughly 18 s, with only the last few seconds of sliding, corresponding to large SAD values, displaying deviation from the prediction of the linearized model.
