Chapter 15: Energy

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Chapter 15 Energy

• Section 15.2
• Energy Conversion and Conservation

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Conservation of Energy

• Energy cannot be created or destroyed.
• Energy can only be changed from one form to
  another.
• Energy can change into several different forms at
  one time.
• Example light bulb

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• Most common energy conversion is from potential
  to kinetic energy
• Gravitational potential energy of an object is
  converted to kinetic energy as the object falls.
• Potential energy can become kinetic and vice
  versa.
• Example Pendulums

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Energy Conversion Calculations

• Mechanical Energy KE PE
• Law of conservation of energy can be applied to
  any mechanical process if friction can be
  ignored.
• (KE PE)beginning (KE PE)end
• Math problems page 458

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Energy and Mass

• Einsteins famous equation
• E mc2
• m mass
• c speed of light (3 x 108 m/s)
• Shows that matter can be converted into energy
  and energy can be converted into mass.

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