# Do rolling objects “weight” more? We know that whenever an object is supported by a surface, the gravitational force on the object is countered by the supporting force of the surface.

Assume an object is rolling without slipping. There is an instantaneous center of zero velocity (IC) at the point at which the object touches ground. Then we can think of the center of mass of the object as momentarily "rotating" about the IC.

But we also know that whenever an object rotates about a point, there is a centripetal force keeping the object on its orbit about the point. If, say, a cylinder is rolling on the surface, does this mean there is now an extra force in addition to the gravitational force acting on the surface below that is proportional to the speed of the rolling object?

Do rolling objects therefore seem to weight more?

• The center of mass of the object DOES NOT momentarily rotate about the IC. The starting assumption is incorrect, so the analysis that follows is incorrect. – David White Apr 11 at 19:29