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Transcript of Energy
![Page 1: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/1.jpg)
Energy
• Please take out your notebook, formula sheet and calculator.
![Page 2: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/2.jpg)
Energy
Def: the ability to cause change
![Page 3: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/3.jpg)
Kinetic Energy
• Def: The energy of motion • Equation to calculate Kinetic energy
– KE = ½ mv2
• The units for energy are Joules (J).
![Page 4: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/4.jpg)
KE Videos
KE ttp::: l n o :m r w:h g e c e cg a hll: om:s t s: l: r ::::::i c i e d f ee
:::::::::::::::::::::: tmlh
![Page 5: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/5.jpg)
Relationships
• The more speed an object has, the more KE it will also have
• ↑ speed ↑ KE
10 m/s 20 m/s
VS
![Page 6: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/6.jpg)
• The more mass an object has, the more KE it will also have
• ↑ mass ↑ KE
VS1000 kg 100 kg
![Page 7: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/7.jpg)
Math Practice
• What is the KE of a baseball moving at a speed of 40m/s if the baseball has a mass of .15kg?
• KE = ½ mv2
• KE = ½ (.15kg)(402 m/s)• KE = 120 J
![Page 8: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/8.jpg)
• What is the KE of a 1000 kg car moving at a speed of 10 m/s?
• KE = ½ mv2
• KE = ½ (1000kg)(10m/s)2
• KE = 50,000 J
![Page 9: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/9.jpg)
• PE http://glencoe.mcgraw-hill.com/sites/dl/free/0078600510/160350/00035807.html
![Page 10: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/10.jpg)
Potential Energy
• Def: stored energy.– Chemical potential energy – gas, food– Elastic potential energy – compressed spring,
stretched rubber band– Gravitational potential energy – anything that
can fall
![Page 11: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/11.jpg)
GPE
• GPE can be calculated. • Mass x gravity x height• GPE = mgh• Lets practice some math!
– Get out your calculators!
![Page 12: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/12.jpg)
Relationships
• The higher an object is, the more GPE it will also have
• ↑ height ↑ GPE
![Page 13: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/13.jpg)
Relationships
• The more weight an object has, the more GPE it will also have
• ↑ weight ↑ GPE
![Page 14: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/14.jpg)
More Practice
• Find the GPE of a coffee mug with a mass of .3kg on a 1m high counter top.
• GPE = mgh• GPE = (.3kg)(9.8m/s/s)(1m)• GPE = 2.94 J
![Page 15: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/15.jpg)
More Practice
• Find the GPE of a 8000 N roller coaster car 45 m off the ground.
• GPE = mgh = wt*h• GPE = (8000N)(45m)• GPE = 360,000 J
![Page 16: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/16.jpg)
Video
![Page 17: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/17.jpg)
Conservation of Energy
• Energy can be neither created nor destroyed.
• It CAN be changed, or converted.• KE to GPE and back is only one example!
![Page 18: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/18.jpg)
Forms of Energy
• Chemical – charcoal, gas, batteries• Electromagnetic – electricity, magnetism
– Light – x-rays, gamma rays, visible light• Mechanical – moving objects, KE+GPE• Nuclear – fission and fusion• Thermal or Heat – internal motion of
molecules
![Page 19: Energy](https://reader035.fdocuments.in/reader035/viewer/2022070502/56813217550346895d987361/html5/thumbnails/19.jpg)
Examples
• Rub your hands together. What does this do?
• Is there a conversion taking place here? What is it?
• Mechanical Thermal
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More Conversions
• What conversions happen in a car engine?• Chemical mechanical electromagnetic• Chemical thermal• What about a light bulb?• Electromagnetic electromagnetic and
thermal– Electricity Light
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• What conversions happen when you eat?