Energy (chapter 5) Energy – the ability to do work Electrical, thermal, chemical, etc.

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Presentation transcript:

Energy (chapter 5) Energy – the ability to do work Electrical, thermal, chemical, etc.

Kinetic energy – energy of motion KE = ½ mass x velocity 2 The label is the kg m 2 /s 2 …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/s 2 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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