Conten law of conservation of energy

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    10-Aug-2015

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  1. 1. Jirupi@kku.ac.th( law of conservation of energy ) "" (Mechanical energy) ? ?
  2. 2. Jirupi@kku.ac.th ? !!!! ? m yb u ya v g ( law of conservation of energy ) "" ? (law of conservation of energy)
  3. 3. Jirupi@kku.ac.th (=0) E = Ek + Ep = Ek = 1/2 mv2 Ep = mgh + 1/2 kx2
  4. 4. Jirupi@kku.ac.th( law of conservation of energy ) 1 m h0 h1 h2 U = 0 V1 V2
  5. 5. Jirupi@kku.ac.th m h2 v1 h1 h2 v2 v2 = u2 + 2gs v1 v12 = 02 + 2g(h0 h1) 1/2 m 1/2m12 = mg(h0 h1)1/2 m12 + mgh1 = mgh0 .(a) v2 v22 = 02 + 2g(h0 h2) 1/2 m 1/2m22 + mgh2 = mgh0 .(b) (a) = (b) (Law of Conversation of energy) 2 1/2m12+ mgh1 = 1/2m22+ mgh2

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