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Physics Energy

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Law of Conservation of Energy energy cannot be created or destroyed only transferred from one form to another Electric LightChemical Mechanical

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2 forms of mechanical energy 1. Kinetic energy (KE) -energy due to motion KE = ½ mv 2 (J) (kg)(m/s) 2 m is the mass of the object in kg v is the velocity in m/s

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2. Potential energy (PE) -energy due to position or condition ex: book high on a shelf stretched rubber band wound up clock Known as gravitational potential energy PE = m g h (J) (kg)(m/s 2 )(m) m is the mass of the object in kg g is the acceleration due to gravity 9.81m/s 2 h is the height in m

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Check up: Where does the pendulum have greatest PE? Where does the pendulum have greatest KE? Greatest PE Greatest KE

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Energy Every observable change requires energy.

Energy Every observable change requires energy.

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