Disclaimer This presentation may contain copyrighted material. DO NOT DISTRIBUTE

Energy Dayna Martínez Javier Fuentes STARS University of South Florida Maniscalco Elementary

What is energy? Energy is defined as the ability to do work.

What is work? Work = Force x Distance NO YES

Potential and Kinetic Energy Potential Energy Stored energy and energy of position Kinetic Energy Energy of motion

Law of Conservation of Energy Energy can never be made or destroyed but it can change forms Example: A car transforms the gas stored into movement. This is an example of energy transformation. Can you think of another example?

Energy Transfer Movement of energy from one place or object to another.

Forms of Energy Solar energy Energy that comes from the sun Light Radiatio n that we can see Heat Radiatio n that we can feel

Forms of Energy Chemical energy Energy that can be released by a chemical reaction Fuel Food

Forms of Energy Mechanical energy The combination of all the kinetic and potential energy that something has

Forms of Energy Electrical energy Energy that comes from an electric current Electric current Results from the movement of electrons

Forms of Energy Sound Energy Waves of energy created when an object vibrates. Sound energy can travel through many objects.

-Sound waves require some kind of material to travel through. They can’t move through a vacuum. -Sound waves move much slower than light waves. -Sound waves are like heat conduction. No particles actually travel. Sound Waves Sound waves are traveling through the air from the clock to her ears. But what is really traveling is ENERGY!!!

How does sound waves travel? Particles get bumped, and they bump the ones next to them. Sound should travels faster in a solid or liquid, where the particles are closer together and can bump each other quicker.

Sound waves travel down the ear canal and hit the eardrum which vibrates The hammer, anvil and stirrup transfers the vibration and amplifies it This amplified vibration is passed into the inner ear Inside the inner ear there are nerve cells that transmit electrical pulses to the brain as they are stimulated. The brain can interpret these pulses as 'sounds'. And that's how we hear!

Lab Sound Travels Page 79