# Chapter 5 Section 1  Every change that occurs requires energy.  Energy is the ability to do work.  All moving objects have energy  You can tell an.

## Presentation on theme: "Chapter 5 Section 1  Every change that occurs requires energy.  Energy is the ability to do work.  All moving objects have energy  You can tell an."— Presentation transcript:

Chapter 5 Section 1

 Every change that occurs requires energy.  Energy is the ability to do work.  All moving objects have energy  You can tell an object has energy when it:  Changes its environment  Changes itself  Energy can be stored and moved from place to place

 Energy exists in many different forms  It may look different, but it’s still energy. Examples: electrical, chemical, radiant, and thermal

Potential Energy Kinetic Energy All Energy Gravitation Potential Energy Elastic Potential Energy Chemical Potential Energy

 Kinetic energy- energy in the form of motion  Depends on mass and speed of an object  Increase in either mass or speed = increase in energy  KE =1/2 mv 2  Units = kg*m/s  The SI unit is called joule (J).  KE = ½ mv 2 velocity changes will impact KE more because velocity is squared.

 Shooting a rubber band.  Water falling over the fall.  A Yo-Yo in motion.  Releasing the arrow from the bow.

 Potential Energy is stored energy.  Stored chemically in fuel, the nucleus of atoms, and in foods.  Or stored because of the work done on it: Stretching a rubber band. Winding a watch. Pulling back on a bow’s arrow. Lifting a brick high in the air.

Stretching a rubber band.. -Stores energy Water at the top of a waterfall. -Stores energy Yo–Yo in held in your hand.. -Stores energy because of position Drawing a Bow… -Stores energy because of position

 Energy that is stored due to being stretched or compressed is called elastic potential energy.

 Chemical Potential Energy – Energy stored in chemical bonds  Gasoline, food, hand warmers

 Gravitational Potential Energy- Energy stored due to position above the surface of Earth  Gravitational Potential Energy called "GPE" is a measure of how far an object can fall. The higher up it is, the further it can fall and the more GPE it has.  GPE depends on the object's mass and height.  GPE = m x h x a(9.8m/s ²)  Like all other forms of energy GPE is measured in joules.

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