CHAPTER 7 ENERGY

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CHAPTER 7 ENERGY

• Section 7.2 Energy Transformations

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7.2 Conservation of Energy

• Systems change as energy flows and changes from
  one part of the system to another.
• Each change transfers energy or transforms energy
  from one form to another.

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7.2 Energy flow

• How can we predict how energy will flow?
• One thing we can always be sure of is that
  systems tend to move from higher to lower energy.

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7.2 Sources of energy

• The chemical potential energy stored in the food
  you eat is converted into simple sugars that are
  burned as your muscles work against gravity as
  you climb the hill.

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7.2 Units of energy

• Some units of energy that are more appropriate
  for everyday use are the kilowatt hour (kWh),
  food Calorie, and British thermal unit.

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7.3 Conservation of Energy

• When you throw a ball in the air, the energy
  transforms from kinetic to potential and then
  back to kinetic.

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