What is energy?. What is energy? What is energy? Energy can be defined as the ability to do work. It exists in many forms and can be changed from one.

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Presentation transcript:

What is energy?

What is energy? Energy can be defined as the ability to do work. It exists in many forms and can be changed from one form to another. For example: Chemical energy in food is converted to thermal energy and kinetic energy by our bodies. Gravitational potential energy in a ball is converted to kinetic energy when it falls to the ground. Photo credit: © 2011 Jupiterimages Corporation What other energy transfers can you think of? In all these transfers the energy is not lost, it is conserved. Energy cannot be destroyed or created.

Different types of energy There are many different types of energy: thermal light sound elastic gravitational kinetic electrical chemical nuclear Photo credit: © 2011 Jupiterimages Corporation Can you think of examples of each type of energy?

Different types of energy

Converting energy