Energy and energy Energy and energy resourcesresources

Section 1Section 1

What is Energy?What is Energy?

Energy is the ability to do work.Energy is the ability to do work.

Work is when a force causes an object to Work is when a force causes an object to move in the direction of the forcemove in the direction of the force

Work and energy are both expressed in Work and energy are both expressed in joulesjoules

Kinetic energyKinetic energy

The energy of motion.The energy of motion. If it moves it has kinetic energy.If it moves it has kinetic energy. Kinetic energy can be calculated using Kinetic energy can be calculated using

mass and velocitymass and velocity KE=mvKE=mv22/2/2 Example If a car with a mass of 2000kg is Example If a car with a mass of 2000kg is

traveling at 30 m/s what is it’s KE?traveling at 30 m/s what is it’s KE? {2000 x (30 x 30) } / 2 = 900,000 joules{2000 x (30 x 30) } / 2 = 900,000 joules

Potential energyPotential energy

The energy of positionThe energy of position Depends on weight and heightDepends on weight and height GPE=weight GPE=weight (in Newtons)(in Newtons) X height X height (in meters)(in meters) Example- the 10 N rock is balanced on the top Example- the 10 N rock is balanced on the top

of the 1400 m hill. What is it’s gravitational of the 1400 m hill. What is it’s gravitational potential energy? potential energy?

GPE = 10 N X 1400 m = 14,000 joulesGPE = 10 N X 1400 m = 14,000 jouleshttp://science.howstuffworks.com/engineering/struhttp://science.howstuffworks.com/engineering/structural/roller-coaster3.htmctural/roller-coaster3.htmhttp://www.science-animations.com/support-files/ehttp://www.science-animations.com/support-files/energy.swfnergy.swf

Mechanical energyMechanical energy

Is the combination of potential and kinetic Is the combination of potential and kinetic energyenergy

Because the two energies are closely Because the two energies are closely related.related.

ME= GPE+KEME= GPE+KE

http://www.physicsclassroom.com/mmedia/ehttp://www.physicsclassroom.com/mmedia/energy/se.cfmnergy/se.cfm

Other types of energyOther types of energy

Thermal –Thermal – All of the atoms in things move, this All of the atoms in things move, this molecular movement is measured by molecular movement is measured by temperature. Boiling water takes thermal temperature. Boiling water takes thermal energy. energy. http://www.nd.edu/~ysun/Yang/PhysicsAnimatiohttp://www.nd.edu/~ysun/Yang/PhysicsAnimation/collection/transportP.swfn/collection/transportP.swf

Chemical- Chemical- Energy can be stored in the bonds Energy can be stored in the bonds between atoms, when you break these bonds to between atoms, when you break these bonds to rearrange the atoms you can release the rearrange the atoms you can release the energy. Digesting food releases chemical energy. Digesting food releases chemical energyenergy

( possible in the dark lifesavers activity)( possible in the dark lifesavers activity)

Other types of energy Other types of energy

Electrical-Electrical- when the electrons in a wire ( or other when the electrons in a wire ( or other substance) move back and forth.substance) move back and forth.

Sound-Sound- is the movement and vibrations of is the movement and vibrations of particles in the air, usually caused by movement. particles in the air, usually caused by movement. ( needs particles to work, there is no sound in ( needs particles to work, there is no sound in space, so a space ship blowing up would space, so a space ship blowing up would actually be silent) actually be silent)

Light- Light- the vibrations of electrically charged the vibrations of electrically charged particles. ( does not need atom particles to work particles. ( does not need atom particles to work so you would see the blast in space!) so you would see the blast in space!)

Other types of energyOther types of energy

Nuclear-Nuclear- Energy created by changing the Energy created by changing the nucleus of an atom. There are two types…nucleus of an atom. There are two types…

Fission - which is taking a big atom and Fission - which is taking a big atom and breaking it apart ( power plants breaking it apart ( power plants

like Cordova do this)like Cordova do this)

Fusion- combining small atoms. (The Fusion- combining small atoms. (The

sun takes the small atoms of sun takes the small atoms of

hydrogen and fuses them to make hydrogen and fuses them to make

helium.) helium.)

Section 2 Section 2

Energy ConversionsEnergy Conversions