Energy and energy resources Section 1 What is Energy?

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Presentation transcript:

Energy and energy resources Section 1 What is Energy?

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

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

Potential energy  The energy of position  Depends on weight and height  GPE=weight (in Newtons) X height (in meters)  Example- the 10 N rock is balanced on the top of the 1400 m hill. What is it’s gravitational potential energy?  GPE = 10 N X 1400 m = 14,000 joules ctural/roller-coaster3.htm ctural/roller-coaster3.htm files/energy.swf files/energy.swf

Mechanical energy  Is the combination of potential and kinetic energy  Because the two energies are closely related.  ME= GPE+KE nergy/se.cfm nergy/se.cfm

Other types of energy  Thermal – All of the atoms in things move, this molecular movement is measured by temperature. Boiling water takes thermal energy. n/collection/transportP.swf n/collection/transportP.swf n/collection/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)

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!)

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) 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.)

Section 2 Energy Conversions