The discussion centers on the behavior of friction in a system involving a turntable with positive angular acceleration. Specifically, friction acts in the tangential direction despite the common understanding that it opposes motion. The scenario involves a turntable rotating counter-clockwise, with a maximum tension of 100 N in the cord and a static friction coefficient (μs) of 0.1. The analysis reveals that friction must have both tangential and radial components due to the dynamics of the system.
PREREQUISITESPhysics students, mechanical engineers, and anyone interested in understanding the dynamics of rotating systems and the role of friction in motion.
Is there some information you're not letting us in on? For instance, is the turntable undergoing negative angular acceleration?eurekameh said:http://imageshack.us/photo/my-images/440/49789320.png/
Assuming the indicated direction of motion, why is friction acting as shown in the tangential direction? Shouldn't it be acting in the opposite direction?