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Energy

Energy. Kinetic and Potential Energy. What is Energy?. Remember: Work is done when a force moves an object in the same direction! The ability to do work or cause change is called energy. Types of Energy. Two basic kinds of energy are kinetic and potential energy . Potential.

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Energy

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  1. Energy Kinetic and Potential Energy

  2. What is Energy? • Remember: Work is done when a force moves an object in the same direction! • The ability to do work or cause change is called energy.

  3. Types of Energy • Two basic kinds of energy are kinetic and potential energy. Potential Kinetic Kinetic Potential

  4. Kinetic Energy • The energy of motion • Examples: car driving down the road, ball rolling down hill • Kinetic energy of an object depends on both its mass and velocity (speed) • Kinetic energy increases as mass increases • Kinetic energy increases as speed increases

  5. Potential Energy • Stored energy • This type of energy has potential to do work • Examples: toy at the top of staircase, book on bookshelf, apple on tree, stretched elastic) • 2 types of potential energy: • gravitational potential energy • elastic potential energy

  6. Elastic Potential Energy • That can be stretched or compressed (squished) • Examples: rubber band, bow and arrow, slinky, trampoline

  7. Gravitational Potential Energy • Energy based on height • Depends on height and weight • The more an object weighs the greater its gravitational potential energy • The greater the object’s height, the greater its gravitational potential energy

  8. Energy Transformations • Energy Transformations are when one type of energy is changed into another • The Law of the Conservation of Energy states that energy cannot be created or destroyed, but can be changedfrom one object to another • Objects can alternate between having kinetic and potential energy, or can have some of both at the same time.

  9. Energy Transformations • One of the most common energy transformations is the transformation between potential energy and kinetic energy.

  10. Energy Transformations • When you lift the marble off the ground it gets potential energy because of its height. • Potential energy is greatest at the highest point

  11. Energy Transformations • As the marble moves down, Potential energy is converted into kinetic energy • Kinetic energy is greatest at the lowest point

  12. Energy Transformations • The marble slows down as it goes uphill because kinetic energy is being changed back into potential energy.

  13. Energy Transformation on a Swing 0% Kinetic 100% Potential At the top of the swing, you have all potential energy, as you swing down you change your PE into kinetic energy. At the bottom of the swing you have all KE. As you go back up KE goes back to PE 100 % Kinetic 0% Potential

  14. Energy Transformations with a falling object

  15. Energy Transformation on a Roller Coaster

  16. Energy Transformations 100% Potential 100% Potential 50% potential, 50% kinetic 50% potential, 50% kinetic 100% Kinetic

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