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# 15.1 notes

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### 15.1 notes

1. 1. Energy and its forms Energy is the ability to do work Work is the transfer of energy
2. 2. Kinetic Energy <ul><li>The energy of motion </li></ul><ul><li>Kinetic energy depends on its mass and speed </li></ul><ul><li>Kinetic Energy = 1/2mv 2 </li></ul><ul><li>Example – A .10kg bird is flying at a constant speed of 8.0 m/s What is the bird’s kinetic energy? </li></ul><ul><li>m = .10kg v = 8.0 m/s </li></ul><ul><ul><li>½(.10kg)(8.0 m/s) 2 =3.2J </li></ul></ul>
3. 3. Potential Energy <ul><li>Two types </li></ul><ul><li>Gravitational depends on mass, height and gravity. Height is relative to a point </li></ul><ul><li>GPE = mgh </li></ul><ul><li>Elastic Potential energy of an object that is stretched or compressed. </li></ul><ul><li>A diver at the top of a 10 m board has a mass of 50 kg. What is her potential energy relative to the water below? </li></ul><ul><ul><ul><ul><li>M= 50kg g= 9.8m/s 2 h= 10m </li></ul></ul></ul></ul><ul><ul><ul><ul><li>(50kg)(9.8m/s)(10m)=4900J </li></ul></ul></ul></ul>
4. 4. Forms of energy <ul><li>Mechanical – energy associated with position and motion of everyday objects </li></ul><ul><li>Thermal – Total kinetic and potential energy of all particles of an object </li></ul><ul><li>Chemical – is the energy stored in the chemical bonds in compounds </li></ul>
5. 5. Forms of energy <ul><li>Electrical – energy associated with electrical charges </li></ul><ul><li>Electromagnetic – Energy that travels through space in waves (visable light and x-rays are examples) </li></ul><ul><li>Nuclear – energy stored in atomic nuclei. </li></ul>
6. 6. <ul><li>Nuclear power plants produce electricity </li></ul><ul><li>Atoms are split and the heat generated is used to heat water </li></ul><ul><li>Steam Spins turbines making electricity </li></ul>
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