1. Energy! IT MAKES THINGS MOVE

2. Objectives  SWBAT  Identify the seven forms of energy  Define energy

3. What is Energy?  Objects move because of energy  Energy: the ability to make things move  Energy is NOT like matter  Energy has no mass and does not take up space

4. Forms of Energy  1. Chemical energy : holds atoms in molecules together. Chemical energy can be released during chemical reactions; such as the burning of wood  Ex: H 2 O 2 : hydrogen peroxide  2. Electrical energy : movement of electrons through matter.  Ex: electricity

5. Forms of energy continued…..  3. Heat energy : is the vibration of particles within matter. Faster the particles vibrate, the more heat energy they have.  Ex: think of some examples and share with the class.  4. Light energy : energy carried by light

6. Forms of energy continued…..  5. Mechanical energy : the energy of moving things  Ex: a pulley, washing machine, air conditioner, generator  6. Nuclear energy : holds the protons and neutrons together in the nucleus.

7. Forms of energy continued  7. Sound energy : sound energy vibrates air molecules. The vibrating molecules move tiny bones in your ear. The message is then interpreted by the brain. Sound energy vibrates through matter; water, air…..  Ex: make a loudspeaker and say hello through the opening…what do you feel as your voice moves through the paper?

8. Can energy change forms?  Energy can be changed, or converted, from one form to another. For example, a hot air balloon:  The air that fills the balloon is heated  The heat energy causes the air molecules inside the balloon to move very fast  Warm air rises above cool air: The temperature inside the balloon is much different than outside the balloon so this difference creates “lift” or causes the balloon to rise  In other words the heat energy used to lift the balloon is converted into mechanical energy to move the balloon.  What other energy, not mentioned in notes, is used to move the balloon?

9. Potential and Kinetic Energy  Potential Energy: Energy of position; stored energy that is not being used  Kinetic Energy: Moving energy or energy in action

10. Potential Energy  A roller coaster sits on top of a hill. It is about to speed down the track, but it has not moved yet.  It has energy because of where it is.  Once the roller coaster begins to move the potential energy converts to Kinetic energy.  Substances like wood, coal, oil and gasoline have stored energy because of their chemical composition. They can burn.  When they burn they give off heat and light energy

11. Potential Energy

12. Kinetic Energy  The potential energy of the roller coaster at the top of the hill is converted into kinetic energy as the roller coaster speeds down the hill

13. Conservation of Energy  The sum of KE and PE remain constant at each successive position  https://www.youtube.com/watch?v=LrRdKmjhOgw https://www.youtube.com/watch?v=LrRdKmjhOgw