Energy and energy resources

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Energy and energy resources

• Section 1
• What is Energy?

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Energy is the ability to do work.

• Work is when a force causes an object to move in
  the direction of the force
• Work and energy are both expressed in joules

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Kinetic energy

• The energy of motion.
• If it moves it has kinetic energy.
• Kinetic energy can be calculated using mass and
  velocity
• KEmv2/2
• Example If a car with a mass of 2000kg is
  traveling at 30 m/s what is its KE?
• 2000 x (30 x 30) / 2 900,000 joules

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Potential energy

• The energy of position
• Depends on weight and height
• GPEweight (in Newtons) X height (in meters)
• Example- the 10 N rock is balanced on the top of
  the 1400 m hill. What is its gravitational
  potential energy?
• GPE 10 N X 1400 m 14,000 joules
• http//science.howstuffworks.com/engineering/struc
  tural/roller-coaster3.htm
• http//www.science-animations.com/support-files/en
  ergy.swf

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Mechanical energy

• Is the combination of potential and kinetic
  energy
• Because the two energies are closely related.
• ME GPEKE
• http//www.physicsclassroom.com/mmedia/energy/se.c
  fm

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Other types of energy

• Thermal All of the atoms in things move, this
  molecular movement is measured by temperature.
  Boiling water takes thermal energy.
  http//www.nd.edu/ysun/Yang/PhysicsAnimation/coll
  ection/transportP.swf
• Chemical- Energy can be stored in the bonds
  between atoms, when you break these bonds to
  rearrange the atoms you can release the energy.
  Digesting food releases chemical energy
• ( possible in the dark lifesavers activity)

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Other types of energy

• Electrical- when the electrons in a wire ( or
  other substance) move back and forth.
• Sound- is the movement and vibrations of
  particles in the air, usually caused by movement.
  ( needs particles to work, there is no sound in
  space, so a space ship blowing up would actually
  be silent)
• Light- the vibrations of electrically charged
  particles. ( does not need atom particles to work
  so you would see the blast in space!)

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Other types of energy

• Nuclear- Energy created by changing the nucleus
  of an atom. There are two types
• Fission - which is taking a big atom and
  breaking it apart ( power plants like Cordova
  do this)
• Fusion- combining small atoms. (The
• sun takes the small atoms of
• hydrogen and fuses them to make
• helium.)

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Section 2

• Energy Conversions