ENERGY

Energy – The ability to do work How is energy involved in the following picture? The tennis player does work On her racket The racket does work on the ball The ball does work on the net Energy Video http://player.discoveryeducation.com/index.cfm?guidAssetId=2FBE6C5D-0DD3-4210-B476-1A679001C8EE&blnFromSearch=1&productcode=US

Increase Mass Increase K.E. Increase Velocity Increase K.E. STATES OF ENERGY 1. Kinetic - The energy of motion, when energy is being transferred. The faster the motion, the more kinetic energy it has. The bigger the mass, the more Kinetic energy it has. Depends on mass and velocity Increase Mass Increase K.E. Increase Velocity Increase K.E.

Why would a high speed collision cause more damage than a low speed collision?

Stored Energy or energy that is waiting to be transferred. STATES OF ENERGY Stored Energy or energy that is waiting to be transferred. 2. Potential - -Object is not moving or doing work. BUT… the shape or position of the object can change the amount of potential energy. -When work is done on an object, potential energy is stored. -Has the ability to turn into kinetic energy.

What type of energy does each Picture demonstrate? Kinetic – When you Swing hammer Potential Potential Kinetic

The Roller Coaster http://www.ohiomathworks.org/themeparks/coastequation.gif

7 Forms of Energy http://www.teachertube.com/viewVideo.php?video_id=127807

FORMS OF ENERGY Mechanical – Energy associated with motion, anything moving. POTENTIAL OR KINETIC Examples of mechanical energy

FORMS OF ENERGY 2. Thermal – Heat Energy Is Kinetic Results from friction, causes temperature and phase changes, ALL OTHER TYPES of energy TURN INTO THIS. Solid to Liquid Liquid to Gas

FORMS OF ENERGY Chemical – Energy that is released as a result of molecular bonds being broken. A Form of Potential Energy Examples: All forms of fuel (gasoline, coal, wood, food, radioactive materials) Photosynthesis, batteries.

Chemical Energy in this picture? What are examples of Chemical Energy in this picture? 1. Wood Burning; chemical energy stored in the wood is used to toast your marshmallows 2. Chemical energy is stored in the marshmallow’s sugar molecules. When you eat a marshmallow, chemical energy stored becomes available for you to use.

FORMS OF ENERGY Electrical Energy – Energy of moving electrons. Is always kinetic. The electrical outlets in your home allow you to use electrical energy

FORMS OF ENERGY Sound – Caused by an object’s vibrations. Can also be considered mechanical. Is potential and kinetic Example: Guitar Strings Vibrating Is potential and kinetic

Light – Produced by the vibrations of electrically charged particle that are visible. Is kinetic. LIGHT IS ELECTROMAGNETIC ENERGY

Electromagnetic Spectrum

Other Examples of Electromagnetic Energy Microwave Infrared Radio Waves X-Rays

FORMS OF ENERGY Nuclear – energy associated with changes in the nucleus of an atom. Is potential. Examples: Sun’s Energy Nuclear Power Plant

WHICH FORM OF ENERGY IS REPRESENTED IN EACH PICTURE?

Energy is that "certain something" inside stuff (or matter to be more precise) that makes everything happen. When something or somebody moves or jumps or falls or explodes or breathes or thinks or dances or does anything, it's because energy is being transformed.

CONSERVATION OF ENERGY The Law of Conservation of Energy states that when one form of energy is converted into another form of energy, no energy is destroyed in the process. Energy cannot be Created or Destroyed.

BELLRINGERS Define potential and kinetic energy. Name the 7 types of energy and give an example of each. Which energy types are potential? Which are kinetic? Which are both? Explain the energy tranformations from the sun to your alarm clock. Explain the energy transformations from the sun to you riding a bike. Explain the energy transformations as a pendulum swings. Define renewable and nonrenewable resources and give an example of each.

Bellringer #2 The energy conversion involved with photosynthesis is: a. Nuclear to light to heat to chemical b. Light to chemical c. Chemical to light The energy conversion involved with a flashlight is: a. Electrical to light to heat b. Chemical to electrical to light to heat c. Light to heat The Law of Conservation of Energy states that in energy conversions: a. Energy is used up during conversions b. Energy is not transferred from one form to another. c. Energy is neither created or destroyed only changed from one form to another with no energy loss.