PHYSICS 8A Lecture 9: Work done by Gravity and Potential Energy
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Mgay=fmg key ;) =wg] ex : obj w/ mass m is how high will it pushed against spring ( no travel b4 stopping. Wgtwnt wsp mg (yen to + tzktxixi ) mgh. Power : rate @ which w is being done. Potential e : stored e that dep . on an object"s position. Work done by some force on an olj . (begins + ends @ rest ) [sv= - w| so is pathindepmtent (so is w ) Is in deep . of that w done by the force on an travelling blw the path (work done around closed path -0 ) tmgksy ))= y ;) - mgy ( nf obj . any. Friction x can"t define frictional pe mg n"t d) tension x. =kftv] mean -0 , emwhi tmett conservation of mechanical e (only when wneo ) released from rat. fm#=2. 4m/s-ex:pendv1vm but always ltomotirmsowt :o and wneo off. my.
