Kinetic vs Potential Energies
What is potential energy? What is kinetic energy?
Potential Energy = Stored energy
Kinetic Energy = Motion energy
What are the 5 non-renewable energy sources?
Petroleum (oil)
Nuclear energy (uranium)
Natural gas
Propane
True or false: A turbine makes electricity by itself.
False!
A turbine turns a generator.
The generator makes electricity!
What are the 5 renewable energy sources?
Solar power
Wind power
Geothermal energy
Biomass
Hydropower
The ability to produce change or do work is called _____.
Energy!
You are on a roller coaster. At the top, you have _______ energy. At the bottom, you have ________ energy.
Potential energy
Kinetic energy
What is the main gas found in natural gas?
Methane (C4)
A ____ _______ takes the kinetic energy from wind and turns a generator in order to make electricity.
Wind Turbine
Why does air move?
Uneven heating of Earth causes convection
Using the formula distance ÷ time, calculate the velocity of a runner that sprints 270m in 15 seconds.
velocity = 18m/s
What unit do we measure energy in?
Joule (J)
What are two benefits of non-renewable energies?
Transportation (gasoline and diesel for vehicles)
Heating for homes
Plastic
High energy density and energy efficiency
For a steam turbine, water changes from a liquid to a gas. When this happens ______ and ________ increase.
a) pressure, density
b) volume, pressure
c) density, volume
b) volume and pressure
How does the sun produce its energy?
Fusion!
A 100kg toy is on a 2m shelf. What is the potential energy of the toy?
Use the formula PE= mgh (where g = 9.8).
Don't forget your units!
PE= 1,960 J
What are the four types of Kinetic Energy?
Electrical energy
Radiant energy- solar (sun) energy
Thermal energy- geothermal energy
Motion energy- the wind
What element is coal made out of?
Carbon
There is a name for the special shape of a turbine blade. What is it?
Airfoil
What is a benefit (positive) of using renewable energy?
Does not produce pollution
We can use forever
A 2,000kg song taew rolls down the incline at 3m/s. What is its kinetic energy?
Use the formula: KE = 1/2mv²
Don't forget your units!
KE = 9,000 J
What are the four types of Potential Energy?
Elastic energy- rubber band, bow and arrow
Gravitational Potential energy- water behind a dam
Chemical Energy- food, petroleum
Nuclear Energy- any atom's nucleus
True or False:
Petroleum is not made from the remains of sea animals.
False!
Petroleum was made over millions of years from the remains of small sea animals.
A thermal generator _______ fuel and uses _______ to make electricity.
a) Freezes, steam
b) Burns, water
c) Burns, steam
c) Burns, steam
A thermal generator burns fueld (coal, petroleum) to make steam that will turn a turbine and generator!
Energy is not created nor destroyed, but changed from one form to another.
What is the name of the Law that tells us this?
The Law of Conservation of Energy
What are SI units? And why do we use them? Give one example.
SI unit: International System of units
Used to make exchanging information easier between scientists- we do not need to convert our units.
Examples: Kelvin, meter, kilogram, seconds, ampere, mole