1CHAPTER 7CONSERVATION OF ENERGY• Conservation of mechanical energy• Conservation of total energy of a systemovarious examples• Origin of frictionCONSERVATION OF MECHANICAL ENERGYConsider a system consisting of an object and the Earth. We release the object from a height h above the ground. We take the ground as the zero of potential energy.At the bottom: ()vva yvgh222222=+⇒=o∆∴==Kmvmgh22212.At anyposition y:vg hy22=−()∴==−Kmvmg hy122().0U20=: Kmv22212=Umgy=: Kmv=122Umgh1=: K10=v10=v2vhy
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