CHAPTER 4.

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Presentation transcript:

CHAPTER 4

Kinetic Energy Kinetic E – energy in the form of motion Units are joules (J) KE = ½ m × v 2 Mass in kg Velocity in m/s

Kinetic Energy Determine the kinetic energy of a 625-kg roller coaster car that is moving with a speed of 18.3 m/s.

Potential Energy Potential E – stored energy due to position Three types of potential energy: 1. Elastic potential energy 2. Chemical potential energy 3. Gravitational potential energy

Gravitational Potential Energy GPE = mass x gravity x height GPE = m × 9.8 m/s2 x h GPE in J Mass in kg Height in m

Gravitational Potential Energy A 0.06kg ball starts to fall from a height of 2.9m. How much gravitational potential energy does the ball have at that height?

Law of Conservation of Energy Energy can be converted back and forth between the potential and kinetic Law of conservation of E – energy cannot be created nor destroyed, only the form changes

Fission vs. Fusion Nuclear fission – breaking apart of nuclei, which releases energy Nuclear fusion – 2 H nuclei fuse together to form a He nucleus, which also releases a large amount of energy Ex: how the sun heats the earth

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