Types of Energy
Energy
Do power plants CREATE energy? [Yes or No]
No, energy can't be created or destroyed
The name of the law that states:
"Energy can't be created or destroyed but may simply change forms"
Law of conservation of energy
The energy of motion
Kinetic Energy
The closest star in the universe to earth
The SUN! (Bruh... not cool man)
Energy of Motion
Kinetic Energy
The type of energy outputted by all power plants due to its convenience in converting to other forms
electrical energy
In the absence of friction, Mechanical energy is conserved.
A ball sits at the top of a hill with 200J of GPE. It is not moving. What is the Mechanical Energy of the ball at this point?
ME = KE + PE = 0 + 200 J = 200J
Stored energy due to position
Potential Energy
Patrick Star
The energy of objects bigger than molecules, equal to the sum of KE + PE
Mechanical Energy
ME = KE + PE
What do they use to turn a turbine to convert kinetic energy into electrical energy in a power plant?
Hint: Think water
STEAM
A ball sits atop a compressed spring that has 200J of elastic potential energy. When the ball is released and at the top of its height, what Gravitational Potential energy does it have? (Assume no friction or air resistance)
200 Joules (Energy is conserved)
Calculate GPE for a ball m = 10kg at a height of 10m
GPE = m*g*h where g = 10m/s^2
GPE = 10*10*10 = 1000 Joules
The mass of 1 paper clip
1 gram
The energy found in a wood log, released when burned
Chemical Energy
Overall energy transformation that occurs at a coal power plant
Write as
Initial Energy -> Final Energy
Chemical Energy -> Electrical Energy
A ball, at the top of a hill has 100J of GPE, 1/4th of the way down, how much GPE does it have?
75 Joules
Calculate the kinetic energy of a penguin recently launched off a catapult.
M = 25 kg. Velocity = 10m/s
KE = 1/2*m*v^2
KE = 1/2*25*10^2 = 1250 Joules
Mr. Mellor's favorite spiderman
Tobey Mcguire
Nuclear energy is the energy in the nucleus of all atoms. It is what type of energy?
Potential Energy
What is the most common type of power plant in the USA?
1.Hydroelectric. 2.Nuclear. 3. Thermal
4. Solar. 5. Wind
Thermal (Burning Coal)
A ball placed on top of a hill has 100 joules of gravitational potential energy.
How much kinetic energy will it have at the bottom of the hill if 25 Joules become thermal energy due to friction?
75 Joules
Calculate the elastic potential energy of a spring toy compressed x = 0.5m, with a spring constant k = 1 N/m
EPE = 1/2*k*x^2
EPE = 1/2*1*0.5^2 = 0.125 Joules
The number of subscribers to Mr. Mellor Science
76