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Energy

Energy. Defining Energy. A. What is Energy. 1. Energy is hard define. 2. Because, energy comes in so many forms. 3. Examples: Sound, Chemical, Nuclear, Solar, Electrical, Kinetic, Potential. 4. In addition there is Radiant energy.

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Energy

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  1. Energy Defining Energy

  2. A. What is Energy • 1. Energy is hard define. • 2. Because, energy comes in so many forms. • 3. Examples: Sound, Chemical, Nuclear, Solar, Electrical, Kinetic, Potential. • 4. In addition there is Radiant energy. • 5. Radiant energy includes a range of energy like: radio, microwaves, infrared (heat), visible, ultraviolet, x-rays and gamma rays.

  3. A. What is Energy? • 6. Energy is defined as the ability to do work. • 7. Work is defined as any action that moves an object. • a. For work to occur the object must have moved. • b. No matter how much effort you put in, if it doesn’t move, then no work happened. • c. No movement = No work. • 8. Energy is the ability to move things.

  4. B. Conservation of Energy • 1. Energy can be changed from one form to another. • 2. Energy cannot be created or destroyed. • a. The total sum of energy must remain constant. • b. Most actions in the world involve energy changing.

  5. B. Conservation of Energy • 3. Examples of Energy transformations: • a. Chemical energy in fuels is transformed into heat, light, and movement. • b. Food is chemical energy and is used to run the processes of our body. • c. Electrical energy can be used for heat, light or movement.

  6. C. Mechanical Energy • 1. The two types of mechanical energy are kinetic and potential. • 2. Kinetic energy is the energy of moving objects. • a. Kinetic means moving. • b. Kinetic energy is doing work.

  7. C. Mechanical Energy • 3. Potential energy is stored energy. • a. There is the potential to move an object. • b. Energy can be stored by an object’s position. For example, can it fall. • c. Energy can be stored by an object’s condition. For example, a rubber band stores energy when it is stretched.

  8. C. Mechanical Energy • d. Chemical energy is stored in the bonds between atoms. • e. Nuclear energy is stored in the nucleus of atoms.

  9. C. Mechanical Energy • 4. Potential energy is often changed into kinetic energy. • a. A suspended object has potential energy, which becomes kinetic energy as it falls. • b. A spring in a toy is compressed and stores energy. When the spring is released, the toy moves.

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