kwlq what is energy? k: what do you know? w: what do you want to know? l: what did you learn? q:...
TRANSCRIPT
![Page 1: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/1.jpg)
KWLQ• What is Energy?
K: What do you know?
W: What do you want to know?
L: What did you learn?
Q: What questions do you have?
![Page 2: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/2.jpg)
Notes: Energy
![Page 3: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/3.jpg)
• Energy is the ability to work.
•Work is done when a force exerted on an object moves that object some distance.
•Work is a transfer of energy
NOTES 98-101
![Page 4: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/4.jpg)
Both work and energy are measured in joules.
Units are: Newtons x meters
or
Joules
Work & energy is force times distance
![Page 5: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/5.jpg)
Two Types of Energy
• Kinetic Energy• Energy
associated with motion
• Ex. Dropping the bowling ball.
• Potential Energy
• Stored energy• Ex. Lifting a
bowling ball to a height.
![Page 6: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/6.jpg)
Kinetic Energy= 1/2mass X velocity squared
Kinetic Energy = ½m x v²
![Page 7: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/7.jpg)
Kinetic energy depends on the square velocity! So at twice the speed the truck has 4 x the energy
A more massive truck has more kinetic energy.
If the truck has a mass of 3,600Kg and a velocity of 10m/s, what’s it’s Kinetic energy?
KE = (½ 3600Kg) X (10m/s)² = 180000J
![Page 8: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/8.jpg)
Equation for Gravitational Potential energy
• PEgrav = mass x gravity x height
or• PEgrav = m x g x h
![Page 9: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/9.jpg)
![Page 10: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/10.jpg)
![Page 11: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/11.jpg)
Another type of Potential Energy
• Elastic PE• PE associated with
objects that can be stretched or compressed.
![Page 12: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/12.jpg)
Elastic Potential Energy
![Page 13: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/13.jpg)
Gravitational Potential Energy
PEgrav = mass x gravity x height
50Kg
10 meters high
PEgrav = 50Kg x 9.8m/s/s x 10m = 4900J
![Page 14: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/14.jpg)
Now calculate Kinetic Energy
KE = (½ 50Kg) X (9.8m/s)² = 2401 J
50Kg
What’s its velocity if it falls for one second?
Kinetic Energy = ½m x v²
![Page 15: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/15.jpg)
• Energy conversion – a change from one form of energy to another form.
![Page 16: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/16.jpg)
Energy conversion cont…
• Most forms of energy can be converted into other forms
• Example: Mechanical energy (running water) can be converted into electrical energy (electricity)
![Page 17: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/17.jpg)
Gas engine
photosynthesis
Heat lamp or hair dryer
Oil electricity via power plant
Food your body
For example burning coal at an electrical power plant converts chemical energy into heat. The heat makes steam which turns turbines mechanical energy to make electrical energy. The electrical energy is converted back into heat (oven), light (lights in the house), and mechanical energy (a car’s engine) when it is used.
![Page 18: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/18.jpg)
![Page 19: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/19.jpg)
Conservation of Energy
• Law of Conservation of Energy: when one form of energy is converted into another form of energy, no energy is destroyed in the process
• Energy can not be created or destroyed
![Page 20: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/20.jpg)
![Page 21: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/21.jpg)
Different Forms of Energy
• Mechanical = motion or position of an object
• Thermal = total energy of the particles in an object (the more energy the more heat is given off)
• Chemical = PE stored in chemical bonds (food)
![Page 22: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/22.jpg)
• Electrical = energy caused by moving electric charges
![Page 23: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/23.jpg)
• Electromagnetic energy = visible light, microwaves, x-rays, and uv light
![Page 24: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/24.jpg)
• Nuclear = fission and fusion
![Page 25: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/25.jpg)
Power• Power is the amount of work done in a given time.
Equation for powerPower = work/time
orPower= force x distance/time
![Page 26: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/26.jpg)
Power cont…..
• Units for Power
Joules/second or…
Watt (w)
![Page 27: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/27.jpg)
![Page 28: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/28.jpg)
![Page 29: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/29.jpg)
Formation of fossil fuels
• In the earth’s crust, under distinct pressure, temperature and geological processes, nonrenewable energy formed from once living organisms.
![Page 30: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/30.jpg)
![Page 31: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/31.jpg)
Common Types of Fossil Fuels
•Coal
•Oil (petroleum)
•Natural Gas
![Page 32: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/32.jpg)
• Fossil Fuels make good fuels because the energy stored in them is abundant and easy to release when heated.
• Methane CH4 (gas)• Ethane C2H6 (gas)• Propane C3H8 (gas)• Butane C4H10 (gas)• Pentane C5H12 (liquid, found in gasoline)• Hexane C6H14 (liquid, found in gasoline)• Heptane C7H16 (liquid, found in gasoline)• Octane C8H18 (liquid, found in gasoline)• Pentadecane C15H32 (liquid, found in kerosene and
jet fuel)• Tetracosane C24H50 (liquid, found in lubricating
oil)
![Page 33: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/33.jpg)
Some common uses of Crude Oil
• Solvents• Fertilizers• Pesticides• Plastics • Diesel fuel• Jet fuel• liquified petroleum gas • plastics
•Kerosene
•Synthetic fibers
•Synthetic rubber
•Detergents
![Page 34: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/34.jpg)
![Page 35: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/35.jpg)
![Page 36: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/36.jpg)
![Page 37: KWLQ What is Energy? K: What do you know? W: What do you want to know? L: What did you learn? Q: What questions do you have?](https://reader036.vdocuments.mx/reader036/viewer/2022062300/56649b55550346318e8d2cef/html5/thumbnails/37.jpg)
Source: Energy Information Administration