*13-3 Frictional work △K+AU+△E.=M 1. Consider a block sliding across a horizontal table and eventually coming to rest due to the frictional force For the system block table no external force does any work on the system. Applying Eq(13-2) △K+△E=0 (13-4) As the a decreases, there is a corresponding increase in internal energy of the system Ch 13 Energy III: Conservation of energyCh.13 Energy III: Conservation of energy *13-3 Frictional work 1. Consider a block sliding across a horizontal table and eventually coming to rest due to the frictional force. For the system = block + table, no external force does any work on the system. Applying Eq(13-2) (13-4) As the decreases, there is a corresponding increase in internal energy of the system. K + Eint = 0 K f v K + U + Eint = Wext