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Energy(chapter 5)• Energy – the ability to do work
• Electrical, thermal, chemical, etc.
Kinetic energy – energy of motion
• KE = ½ mass x velocity2
• The label is the kg m2/s2…or the Joule (J)• How does friction affect KE?
Gravitational Potential Energy• Energy stored by objects due to their position above Earth’s
surface• GPE = mgh g = 9.8m/s2
• Let’s look at the connection between GPE and KE…
Potential energy• Stored energy or energy of position• Elastic PE – energy that can be stored in something that
can be stretched or compressed
• Chemical PE – energy stored in chemical bonds
Law of Conservation of Energy
• Energy is neither created nor destroyed, but transformed!• Light bulb (electrical light)• Mechanical energy = PE + KE
Nuclear reactions• Fusion – the combining of 2 hydrogen nuclei
• Fission – splitting one atom into 2!
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