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1-23-2008 Lecture 8

# 1-23-2008 Lecture 8 - Kinetic Energy Amount of kinetic...

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Kinetic Energy - Amount of kinetic energy of a moving object = ½ mv 2 - If mass (m) is in kg and velocity (v) is in m/s, energy is in joules. - On the microscopic level o The average kinetic energy of the particles within a substance is called the temperature. Temperature vs Heat - Temperature is the average kinetic energy per particle - Heat (thermal energy) is the total kinetic energy. Gravitational Potential Energy - The energy which an object stores due to its ability to fall. - It depends on: o The object’s mass (m) o The mass of the planet (Earth) o The distance from the center of the gravitating object. Mass Potential Energy - Energy is stored in matter itself. - This mass-energy is what would be released if an amount of mass, m, were converted into energy. - E = mc 2 Conservation of Energy - Energy can be neither created nor destroyed - It merely changes it form or is exchanged between objects - This principle/law is fundamental to science.

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1-23-2008 Lecture 8 - Kinetic Energy Amount of kinetic...

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