Energy Conversion and Conservation of Energy. Energy Conversion  Energy can be changed from one form to another. Changes in the form of energy are called.

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Energy: Forms and Changes

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Presentation transcript:

Energy Conversion and Conservation of Energy

Energy Conversion  Energy can be changed from one form to another. Changes in the form of energy are called energy conversions.  All forms of energy can be converted into other forms.

Examples of Energy Conversions The sun’s energy through solar cells can be converted directly into electricity. Green plants convert the sun’s energy (electromagnetic) into starches and sugars (chemical energy). In an electric motor, electromagnetic energy is converted to mechanical energy. In a battery, chemical energy is converted into electromagnetic energy. The mechanical energy of a waterfall is converted to electrical energy in a generator. In an automobile engine, fuel is burned to convert chemical energy into heat energy. The heat energy is then changed into mechanical energy.

States of Energy  The most common energy conversion is the conversion between potential and kinetic energy.  All forms of energy can be in either of two states: Potential Kinetic

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. K.E. = mass x velocity 2

Potential Energy  Potential Energy is stored energy.  Potential energy that is dependent on height is called 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 G.P.E. G.P.E. = Weight X Height.  Energy that is stored due to being stretched or compressed is called elastic potential energy.

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 point, the conversion between potential and kinetic energy powers the cars throughout the entire ride.

Kinetic vs. Potential Energy At the point of maximum potential energy, the car has minimum kinetic energy.

The Law of Conservation of Energy  Energy can be neither created nor destroyed by ordinary means. It can only be converted from one form to another. If energy seems to disappear, then scientists look for it – leading to many important discoveries.  All energy can be accounted for. The total amount of energy is the same before and after any process

Law of Conservation of Energy  In 1905, Albert Einstein said that mass and energy can be converted into each other.  He showed that if matter is destroyed, energy is created, and if energy is destroyed mass is created.