Energy

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Energy
2
Nature of Energy

• Energy is all around you.
• Energy can be transferred.
• You use energy when you hit a tennis ball,
  compress a spring, or lift a grocery bag.
• Energy is the ability to do work.

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Kinetic and Potential Energy

• Kinetic energy is energy in motion
• Potential energy is energy that is stored in an
  object. If you stretch a rubber band, you will
  give it potential energy. As the rubber band is
  released, potential energy is changed to kinetic
  energy.

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Forms of Energy

• Solar Energy
• Chemical Energy
• Mechanical energy
• Electric energy
• Sound Energy

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Solar Energy

• Energy that comes from the sun.
• Solar energy is the solar radiation that reaches
  the earth.
• Solar energy is free but the cells and collectors
  are expensive

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Chemical Energy

• Energy stored in fuel.
• Released by a chemical reaction.
• Digesting foodbonds are broken to release energy
  for your body to store and use.
• Sports your body uses energy stored in your
  muscles obtained from food.
• Firea chemical change.

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Mechanical Energy

• Combination of all potential and kinetic energy
• Water in a waterfall, Wind, and Moving vehicles

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Electric Energy

• Electricity of energy from an electric current
• Appliances, Cell phones, music players and other
  battery operated appliances

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Sound Energy

• Energy in the form of vibrations that travel
  through the air
• Can travel through objects

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Changing Energy Forms

• Batteries in a flashlight contain chemical energy
  which is transferred to electric and then light
  energy when the bulb is turned on.

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Example

• Batterieschemical energy then you turn on the
  radio and there is electric energy which turns
  into sound energy.

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Heat and Temperature

• Heat is the transfer of thermal energy between
  objects
• Thermal energy travels from a warmer object to a
  colder object
• Example of a system-a set of parts acting together

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Thermal Energy Transfer

• 3 ways heat can move through a system
  conduction, convection, and radiation
• Conduction-thermal energy moves directly to
  another object
• Convection-thermal energy transferred through the
  movement of a gas or liquid
• Radiation-heat is transferred across space.

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ExamplesMatch the thermal energy transfer method
with the picture

• Conduction
• Convection
• Radiation

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Nonrenewable Resources

• A resource is something that can be used to
  satisfy a need.
• Fossils are remains of dead plants and animals
  found in rock.
• Once used they can not be replaced
• We need to conserve our natural resources
• Needs to be burned

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Examples of Nonrenewable resources
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Renewable Resources

• A resource that can be replaced within a
  reasonable amount of time
• Does not need to be burned
• Solar energy
• Falling water
• Recycled water

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Examples of renewable resources
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Science Up Close

• Hybrid Cars use both electricity and gasoline
• Receives more miles per tank of gas than regular
  cars
• Batteries store chemical energy until it is
  changed into electrical energy
• Reduces pollution because less gas is released
  into the atmosphere

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Questions

• What are kinetic and potential energy?
• What are some forms of energy?
• How is heat transferred?
• How do people use energy resources?
• What are renewable and nonrenewable resources?