# Kinetic Energy to Potential Energy: Relationship in Different Energy Types

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• 0:05 Relationships in…
• 0:58 What Is Kinetic Energy?
• 2:14 What Is Potential Energy?
• 4:04 Relationship Between…
• 5:10 Lesson Summary

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Lesson Transcript
Instructor: John Simmons

John has taught college science courses face-to-face and online since 1994 and has a doctorate in physiology.

This video defines and describes kinetic and potential energy. You'll learn how different types of energy can be classified as potential and kinetic. You'll also find out how kinetic and potential energy are transformed.

## Kinetic Energy to Potential Energy: Relationship in Different Energy Types

Energy gets things done. Energy warms the surface of our planet and blows the wind through our hair. Energy contracts muscles and transmits signals within our brain. Energy illuminates the lights in our homes and moves cars down the road. Energy is usually defined as the ability to do work. Scientists have learned how to change energy from one form into another to make our lives more comfortable. Energy exists in different forms, such as heat, motion, light, chemical, and sound. While there are different forms of energy, all the different forms can be put into two categories. One category would be kinetic energy. That's energy of motion. The other category is potential energy. That's energy stored in an object due to its position.

## What Is Kinetic Energy?

Let's first explore kinetic energy. Kinetic energy of an object is the energy it contains due to movement. If an object is at rest, it doesn't have kinetic energy. If it's moving, then it has kinetic energy. It's pretty simple!

The amount of kinetic energy of an object is dependent upon two variables, one being the mass of the object, the other being the speed or the velocity of the object. Let's look at an equation that will help us calculate kinetic energy and understand the relationship of these variables. Here it is:

Kinetic Energy = ½ mass x velocity^2

Therefore, kinetic energy is directly proportional to both the mass of the object and the square of its speed. This is important because small changes in speed will result in larger changes in kinetic energy. For example, if a car moves twice as fast as another, it will contain four times as much kinetic energy. That is assuming that both cars have the same mass - or even if you talk about the same car and it moves twice as fast, it will also have four times as much kinetic energy.

## What Is Potential Energy?

Now that we have explored kinetic energy, let's now take a look at potential energy. Potential energy is stored in an object when work is done on that object. Work is done when a force moves an object some distance to a new position. In other words, potential energy is stored in a system when something is moved from its natural resting state.

Let's look at an example of potential energy. A mouse trap contains potential energy when the lever is forced into its set position. Within the mouse trap, the potential energy is stored specifically within the spring. When the trap is tripped, the potential energy is released from the spring when the trap resumes its original shape and then perhaps catches a mouse. Potential energy can be stored in other devices as well, such as tires on your car, the shock absorbers on your car, and even wrecking balls that are used to tear down buildings. Metal beams that are used to construct buildings also contain potential energy.

At a much smaller level, potential energy is stored in chemicals. This chemical potential energy is related to the arrangement of the chemicals. The arrangement may be a result of bonds that hold an individual chemical together, or the arrangement could be the arrangement of different chemicals that are existing together within a system. Let's look at a couple of examples. Gasoline is a chemical. That's obviously what we use to run our automobiles. When gasoline is burned, these bonds within the gasoline are broken, and that releases potential energy. Likewise, our bodies break down food chemicals to release energy.

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