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Change in Potential energy equals change in Kinetic energy?
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[QUOTE="conscience, post: 5815758, member: 486016"] I just noticed it is your first post . Welcome to PF ! W = ΔKE is Work Kinetic Energy theorem .W is net work done on the particle .This can further be written as W[SUB]nc[/SUB] + W[SUB]c[/SUB] =ΔKE . W[SUB]nc[/SUB] is work done by non conservative forces ( in your example it is work done by external agent pushing the block up .W[SUB]c[/SUB] is work done by conservative force ( in your example it is work done by gravity ) . Now if you write W[SUB]c[/SUB] as -∆PE , Work KE theorem can be rewritten as ∆KE+∆PE = W[SUB]nc[/SUB] . This is the complete relation .It also applies in your case .In your example ,since W[SUB]nc[/SUB] ≠0 , ∆KE+∆PE ≠ 0 . In your example net work done W = 0 . ∆KE+∆PE = Work done by external agent (whosoever is pushing the block up ) ∆KE+∆PE = 0 only when conservative forces are acting .Here the force exerted by agent pushing the block up is a non conservative force . Hence correct relation to use in your example is ∆KE+∆PE = W[SUB]nc[/SUB] . [/QUOTE]
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Change in Potential energy equals change in Kinetic energy?
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