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5. 3 Motion, Forces and Energy Book

Energy information Chapter 5 only
by

Brad Dawson

on 23 September 2014

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Transcript of 5. 3 Motion, Forces and Energy Book

Energy Chemical energy Energy stored in chemical bonds Electrical Energy Energy carried by an electrical current (moving electrons) Thermal Energy All objects have thermal energy Radiant Energy Radiant energy is energy Nuclear Energy Released during fusion or fission 5.1 What is energy? Energy is the ability to cause change Everytime a change occurs, energy has changed form We need to know where the energy came from, what caused the change and what form it is now in The nature of energy Energy of Motion Transferring Energy Transferring energy Kinetic energy and Speed Kinetic Energy and Mass Energy of Position Potential Energy, energy due to position Effected by mass and distance
from the ground Forms of Energy Thermal energy increases as
temperature increases Thermal energy is released by chemical reactions examples include: food,
gasoline, oil, wood Examples: sunlight, infrared radiation, Used to easily transport energy over long distances Nuclear power plants release energy from atoms and convert it to electricity 5.2 Energy Transformations Changing forms of Energy Energy is always changing forms.
It's nonstop usually. Tracking Energy Transformations We can identify what happened to the energy.
Don't worry about the amount, just yet. The Law of Conservation of Energy Energy is never created or destroyed, it only changes form Changing Kinetic and Potential Energy Energy changes form Transforming Chemical Energy Electrical energy Cooking in the microwave Radiant energy Produced by the microwave oven From the wall outlet Thermal energy warm food/water Example: swing (draw swing on board) Transforming
Electrical Energy Transforming
Thermal Energy Kinetic Energy listening to the Radio Sound Energy of air speaker system Electrical Energy Radio Signal Kinetic energy movement of eardrum and fluid Electrical Energy of brain and nerve cells Discribe an example for thermal energy Generating Electrical Energy A generator transforms kinetic energy into electrical energy A motor transforms electrical energy into kinetic energy. A turbine is a type of generator. Most power plants use a turbine to generate electricity. Power Plants For power plants to gernate electricty something needs to spin the turbine. Coal, Oil and Nuclear power plants use the heat to boil water. The steam us pushed through tubing and aimed at the turbine to spin it. Wind turbines simply have the wind turning the turbine. Hydroelectric Dams use falling water to turn the turbines. 5. 3 Sources of energy Using Energy Energy Resources Nearly all the energy you use
is traced back to the Sun. A bit comes from the Earth's interior as (radioactive) heat. Fossil fuels All fossil fuels come from the remains of organisms How do fossil fuels form? Organisms absorb sunlight Sunlight Radiant Energy Chemical Energy Chemical Energy Heat and pressure Using fossil fuels Fossil fuels are non-renewable resources. Once it's used, its gone for for good. Pollution, like acid rain, is created while burning fossil fuels Nuclear Energy Diagram how nuclear energy is produced. Page 141 Pollution is created by the remains of the radioactive material Nuclear energy could create a large amount of pollution that would devastate an area for many generations. Hydroelectricity Renewable energy - will replenish itself (use energy from the sun) Solar Energy Inexhaustible resource.
Will 'never' run out. Pollution is created while building photovoltaic devices Photovoltaics convert radiant energy directly to electrical energy Geothermal Energy underground temperature, close to the surface, is about 60 degrees ALL YEAR! As you move closer to the earths center, temperature begins to get very hot. We believe that radioactive materials release, at least, a portion of this energy. Converting it from nuclear to thermal. Geothermal reservoirs Pumping water deep in to the earth, then piping it out as very hot water or steam Geothermal power plants Energy from the ocean Using Tidal Energy Water flows into a bay during high tide, then out during low tide. As the water moved into and out of the bay, it passes through a man made channel. Conserving Energy Small changes in your behavior can save you and your family money each month. Wind Turbines convert kinetic energy of the wind into electrical energy. Wind Somethings spins the turbine, which spins the generator, which produces electricity for us! Heat pumps can be used to help heat and cool a building. The ground temperatures stays around 60 degrees year round (see video next)
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