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Originally Posted by dlavery
- to avoid having the referees calculate coefficients of friction in real time to determine if a robot would stay on the bar or not, we assume that the Chin-up Bar has a frictionless surface.
A - if the attachment device (grapple hook, gripper or whatever) is just in contact with the horizontal Chin-up Bar (and does not touch the fittings or vertical post), then it is assumed that if the vertical post and fittings were removed then the robot would freely swing "inside" and under the Chin-up Bar, and would be cleanly hanging under the standard definition.
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Don't these two statements clash? If a robot is hanging from the ground, it must be exerting some lateral force since the bar is not directly above it. It is possible to counter this force with friction so that the gripping device will not slide across the bar and come in contact with the vertical bar or couplings. However, if we assume the bar is a fricitonless surface, the robot will slide across it regardless.