What is energy?. Forms of Energy: KE = Kinetic Energy (motion) PE = Potential Energy (position) ME = Mechanical Energy = KE + PE = ½ mv 2 + mgh.

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Presentation transcript:

What is energy?

Forms of Energy: KE = Kinetic Energy (motion) PE = Potential Energy (position) ME = Mechanical Energy = KE + PE = ½ mv 2 + mgh

What is energy? Forms of Energy: KE = Kinetic Energy (motion) PE = Potential Energy (position) ME = Mechanical Energy = KE + PE = ½ mv 2 + mgh Where do you measure h from?

What is energy? Forms of Energy: KE = Kinetic Energy (motion) PE = Potential Energy (position) ME = Mechanical Energy = KE + PE = ½ mv 2 + mgh What happens when you bounce a ball?

What is energy? Forms of Energy: KE = Kinetic Energy (motion) PE = Potential Energy (position) ME = Mechanical Energy = KE + PE = ½ mv 2 + mgh Chemical Energy Nuclear Energy Thermal Energy Electrical Energy Radiant Energy (electromagnetic radiation; “light”) Physical Wave Energy (sound, water waves, seismic waves) Mass Unit is the joule

Thermal energy is a measure of the total kinetic energy of the particles of a substance.

Temperature is a measure of the average kinetic energy of the particles of a substance.

Heat is the transfer of thermal energy

Work is the transfer of mechanical energy: W = F d = (Force x Distance) F = ma = (Mass x Acceleration)

Law of conservation of energy

Power = work / time 1 Watt = 1 joule / sec

Many implications!!

World Energy Consumption, by Source

What are the fastest growing energy sources (global)?

World Energy Consumption, by Source

Where in the world is the fastest growth in energy production?

Energy Consumption in the US, by Source

How much of U.S. energy is imported?

Is U.S. per capita energy use increasing or decreasing?

Historical World Energy Production (Gboe = billion barrels of oil equivalent)

What is most U.S. energy used for?

What are the energy sources for transportation?

What is the efficiency of U.S. cars and trucks?

What are the major energy sources produced in the U.S.?

Where does your electricity come from?

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