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The Nature of Energy

The Nature of Energy . Chapter 5 Section 1. Energy. 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

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The Nature of Energy

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  1. The Nature of Energy Chapter 5 Section 1

  2. Energy • 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

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

  4. Kinetic Energy Potential Energy Elastic Potential Energy Gravitation Potential Energy Chemical Potential Energy How is all energy divided? All Energy

  5. Kinetic 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 mv2 • Units = kg*m/s • The SI unit is called joule (J). • KE = ½ mv2 velocity changes will impact KE more because velocity is squared.

  6. Examples of Kinetic Energy… • Shooting a rubber band. • Water falling over the fall. • A Yo-Yo in motion. • Releasing the arrow from the bow.

  7. Potential Energy • 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.

  8. Examples of Potential Energy: 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

  9. Elastic Potential Energy • Energy that is stored due to being stretched or compressed is called elastic potential energy.

  10. Chemical Potential Energy • Chemical Potential Energy – Energy stored in chemical bonds • Gasoline, food, hand warmers

  11. Gravitational Potential Energy • 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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