ENERGY.

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Presentation transcript:

ENERGY

Energy The ability to do work or cause change. Has different forms (position, motion, heat) Can travel in different ways (light, sound, electricity)

Kinetic Energy Energy that comes from motion A spinning bicycle wheel Sprinting runners ANYTHING moving!

Kinetic Energy Ek = 1 mv2 2 May also see it as KE To solve these problems you MUST square velocity first – order of operations!!! Mass (kg) Ek = 1 mv2 2 Speed (m/sec) Kinetic Energy (joules) KE Video

Example Problem What is the kinetic energy of a jogger with a mass of 65.0 kg traveling at a speed of 2.5 m/s?

Potential Energy Stored energy that comes from position A drawn bow (elastic PE) A book on the top shelf (gravitational PE) A stretch rubber band

Potential Energy Ep = mgh Depends on the position above the ground The greater the height, the greater the PE Formulas: GPE = weight x height EP =mgh Mass (kg) Potential Energy (joules) Ep = mgh Height (m) Acceleration of gravity (m/sec2) PE Video

Example Problem Find the gravitational potential energy of a light that has a mass of 13.0 kg and is 4.8 m above the ground.

Roadrunner Examples of KE and PE Videos KE and PE Song Roadrunner Examples of KE and PE

Law of Conservation of Energy Energy can change from one form to another but it can never be created or destroyed under ordinary conditions

Law of Conservation of Energy More Videos Law of Conservation of Energy Types of Energy http://www.youtube.com/watch?v=k60jGJfV8oU&list=PL538B87C890F6F3A1&index=16