Energy ...basics

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This text is meant to accompany class discussions. It is not everything there is to know about energy. It is meant as a prep for class. More detailed notes and examples are given in the class notes, presentations, and demonstrations (click here.)

Energy Forms ...Kinetic Energy

The first form, or representation of energy, is kinetic energy. The word, "kinetic," implies motion and that is what kinetic energy measures. It is the energy of motion. If a body is moving, then it has kinetic energy. The equation for calculating kinetic energy is

Example:

Example

Question
Solution

Calculate the kinetic energy of a heavy 2.0 kg rock that is thrown at 10.0 m/s.

Important:

Example 2

Question
Solution

What is the same about each of the kinetic energies in the two animations?

The maximum kinetic energy is when the ball is moving the fastest at the bottom the drop. The kinetic energy is zero at the highest point in the motion.

To add or remove kinetic energy, "work" must be done to exchange energy to or from another body.

by Tony Wayne ...(If you are a teacher, please feel free to use these resources in your teaching.)

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