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# Physics work done and change in energy

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### Physics work done and change in energy

1. 1. Physics-Work done and change in energy
2. 2. Conservation of energy <ul><li>Change in Kinetic energy= Work Done on the system </li></ul><ul><ul><li>E2-E1=W </li></ul></ul><ul><li>Change in Potential energy=negative of work done on the system </li></ul>
3. 3. Work done by gravity and change in KE <ul><li>=mg. x </li></ul><ul><ul><li>If displacement is towards earth x is positive </li></ul></ul><ul><ul><li>When body is lowered, work done on the body by the gravity= mgx( positive) </li></ul></ul><ul><ul><li>Change in PE=negative of work done </li></ul></ul><ul><ul><li>= - mgx </li></ul></ul><ul><ul><li>Change in KE= work done by the gravity=mgx </li></ul></ul><ul><ul><li>Alternatively, KE +PE=C </li></ul></ul><ul><ul><li>Delta KE=-Delta PE </li></ul></ul><ul><ul><li>Delta KE= mgx </li></ul></ul>
4. 4. Total energy <ul><li>TE=PE+KE+any other form of energy </li></ul><ul><li>Total energy is conserved </li></ul><ul><li>PE1+KE1=PE2+KE2 </li></ul>