THE NATURE OF ENERGY

THE NATURE OF ENERGY

Energy Is the Ability to Do Work

Work involves motion

Is this guy working?

Why is he sweating?

Work happens when a force moves an object over a distance!

Who is working?

The 2 types of energy

Potential

Energy in motion

Stored energy (the potential to do work is there but not seen)

Kinetic

Potential Energy

KINETIC ENERGY

The amount of mass and velocity there is determines how much Kinetic Energy there is

Mass then Kinetic Energy

Velocity then Kinetic Energy

Kinetic Energy = mass x velocity 2

2

http://www.schooltube.com/video/c4ea045957576318dbbe/Bill%20Nye%20The%20Science%20Guy%20-%20Energy%20(Full%20Clip)

Different

Forms of

Energy

Mechanical

Heat or Thermal

Electrical

Electromagnetic

Chemical

Nuclear

Mechanical Energy

•energy that is possessed by an object due to its motion or due to its position

•can be either kinetic energy (energy of motion) or potential energy (stored energy of position)

Ex. A moving car possesses mechanical energy due to its motion

Ex. A barbell lifted high above a weightlifter's head possesses mechanical energy due to its vertical position above the ground

An object that possesses mechanical energy is able to do work. In fact, mechanical energy is often defined as the ability to do work. Any object that possesses mechanical energy - whether it is in the form of potential energy or kinetic energy - is able to do work. That is, its mechanical energy enables that object to apply a force to another object in order to cause it to be moved.

Mechanical Energy is defined as the Ability to Do Work

ElectricalComes from moving electrical

charges in the atom (electrons)Seen as power lines, batteries, lightening, and static electricity

ChemicalPotential energy that is stored as chemical bonds holding together chemical compounds

Examples are chemical batteries, candles (wax), and food in our bodies

http://www.youtube.com/watch?v=n48H-wmXoPk&safe=active

ElectromagneticTravels in wavesIs a combination of magnetic and electrical wavesExamples include light, microwaves, x-rays, radiation, and radio waves

http://www.youtube.com/watch?v=cfXzwh3KadE&safe=active

Heat or Thermal

Can be Kinetic or Potential

Comes from energy inside atoms and molecules

As the atoms or molecules move faster, the thermal energy increases

http://www.schooltube.com/video/a36c86c08bd8e6d290ee/Bill%20Nye%20The%20Science%20Guy%20on%20Heat%20(Full%20Clip)

NuclearEnergy stored in the nucleus of an atomResults when the nucleus splits or joins with another nucleus

Can happen naturally, from a star, or manmade, from a nuclear power plant

http://www.youtube.com/watch?v=VJfIbBDR3e8&safe=active

Energy can be transformed from 1 form to another, especially from potential to kineticExamples include:

The electrical energy from a power line causes a motor to run which creates wind, which travels in waves

A wax candle creates heat which travels in waves and can turn a fan

http://www.gamequarium.org/cgi-bin/search/linfo.cgi?id=7223