TAKE CORNELL NOTES ON A LOOSE SHEET OF NOTEBOOK PAPER. TURN THIS IN ON THURSDAY, 2/20/14.

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Energy: Forms and Changes

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Presentation transcript:

TAKE CORNELL NOTES ON A LOOSE SHEET OF NOTEBOOK PAPER. TURN THIS IN ON THURSDAY, 2/20/14.

States of Energy  All forms of energy can be in either of two states: Potential Kinetic

States of Energy: Kinetic and Potential Energy  Kinetic Energy is energy in motion / action.  Potential Energy is stored energy waiting to be released. Watch this!

Kinetic Energy  The energy of motion is called kinetic energy.  The faster an object moves, the more kinetic energy it has.  The greater the mass of a moving object, the more kinetic energy it has.  Kinetic energy depends on both mass and velocity.

Potential Energy  Potential Energy is stored energy. Stored chemically in fuel, the nucleus of atom, 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.

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

Gravitational Potential Energy  Potential energy that is dependent on height is called gravitational potential energy.

Gravitational Potential Energy  A waterfall, a suspension bridge, and a falling snowflake all have gravitational potential energy.

Gravitational Potential Energy  If you stand on a 3-meter diving board, you have 3 times the Gravitational Potential Energy, than you had on a 1-meter diving board.

Gravitational Potential Energy  “The bigger they are the harder they fall” is not just a saying. It’s true. Objects with more mass have greater Gravitational Potential Energy.  The formula to find G.P.E. is G.P.E. =Weight X Height.

Kinetic-Potential Energy Conversion Roller coasters work because of the energy that is built into the system. Initially, the cars are pulled mechanically up the tallest hill, giving them a great deal of potential energy. From that highest point, the conversion between potential and kinetic energy powers the cars throughout the entire ride. READ ONLY: DO NOT COPY:

Kinetic vs. Potential Energy At the point of maximum potential energy, the car has minimum kinetic energy. COPY THIS DIAGRAM AND LABEL MAX KE (kinetic) AND MAX PE (potential)

Kinetic-Potential Energy Conversions  As a basketball player throws the ball into the air, various energy conversions take place.

Ball slows down Ball speeds up COPY THIS DIAGRAM INTO YOUR NOTES:

Questions and Summary  In your questions column, write 3 questions about your notes  In your summary column, write 2-3 sentences explaining what you learned in this PPT.