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# Kinetic & Potential Energy

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### Kinetic & Potential Energy

1. 1. Kinetic & Potential Energy December 8th, 2008
2. 2. Kinetic Energy <ul><li>Energy of an object due to its motion </li></ul><ul><li>Depends on speed and mass </li></ul><ul><li>KE = 1/2 mv 2 </li></ul><ul><ul><li>So what would hurt more, a bigger car, or a faster car? </li></ul></ul><ul><li>Units? </li></ul><ul><ul><li>Mass (kg) </li></ul></ul><ul><ul><li>Velocity (m/s) </li></ul></ul><ul><ul><li>Kg * m/s * m/s = (kg*m 2) / (s 2 ) = N * m = J!! </li></ul></ul>
3. 3. Work-Kinetic Energy Theorem <ul><li>Net work done by an object is equal to the CHANGE in kinetic energy of the object </li></ul><ul><li>W = ∆KE </li></ul>
4. 4. Potential Energy <ul><li>Energy associated with an object due to the position of an object </li></ul><ul><li>Gravitational Potential Energy </li></ul><ul><ul><li>Potential energy associated with an object due to the position of an object relative to the Earth </li></ul></ul><ul><ul><li>PE= mgh </li></ul></ul><ul><ul><ul><li>M = mass </li></ul></ul></ul><ul><ul><ul><li>G= acceleration due to gravity </li></ul></ul></ul><ul><ul><ul><li>H = height </li></ul></ul></ul>
5. 5. Conservation of Energy <ul><li>Energy is neither created or destroyed </li></ul><ul><ul><li>Where have you heard this before??? </li></ul></ul><ul><ul><li>Sum of all energies in a system is constant </li></ul></ul><ul><li>Mechanical Energy </li></ul><ul><ul><li>Sum of kinetic energy and all forms of potential energy </li></ul></ul><ul><ul><ul><li>ME = PE + KE </li></ul></ul></ul><ul><ul><li>Can change forms, but total amount is constant </li></ul></ul>