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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 All Energy Potential Energy Gravitation Potential Energy Elastic Potential Energy Kinetic 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 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. Shooting band. a rubber 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.
