Understanding Physics of Circular Motion
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A 3-axis (x,y,z) inertial sensor is attached at the periphery of the wheel along with a heavy mass. Forces (or accelerations) on the mass are sensed with the help of the inertial sensor. Two components are displayed - one component is radially outward and the other one is tangent to the circle (Tyre).
Tangent component is damped sinusoid whereas the radial component is unchanged for small oscillations. Changes in radial component can be seen for large angle. Centrifugal force is responsible for it.