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5/22/2017 What is energy? Where does it come from? How is it made/used up? Pre-Test Vocabulary Introduction 1. What is energy, and it’s unit of measure? (2) 2. Identify ALL variables in the following equations (2) a) PE=mgh b) KE=1/2mv2 3. What is the potential energy of a toy car with mass .1kg on a 2m high shelf? 4. What is the Kinetic Energy of a bullet train with mass 20,000 kg with a velocity of 50m/s Unit: Energy Section – Types of Energy Pretest Vocab Cover Flip Hamburger Trim The Fold Share your ½ sheet Hamburger Hotdog Trim Both Folds Hold Vertical Fold top edge 1cm Glue into book sideways Vocab Foldables On the front… Vocab Word On the Inside… Your own definition 1 use or fact Illustration about word Energy Potential Energy Kinetic Energy Conservation of Energy 5/22/2017 What does it mean to have potential? What are some areas you have heard the word potential used? Types of Energy Textbook definition: The ability to do work. What that really means: The ability to make something happen Honestly… No one really knows what energy is, we can only describe how it is manifested! Energy is Measured in Joules (J) Mechanical Energy Potential Energy Elastic Gravitational Kinetic Energy Other Thermal Energy Chemical Energy Nuclear Energy Potential Energy Stored Energy Gravitational PE A skydiver A boulder teetering on a cliff Elastic PE Bow & Arrow Slingshot Spring We will mostly use gravitational PE in class Two Factors Height & Weight Weight = mass x gravity (9.8m/s2) So… PE mgh What is the PE of Mr. Simo’s Heisman Trophy? (Shown Below) 25kg 1.0 m Find 4 separate items around the room For each Item… Sketch the item & location Measure the mass (kg) Measure the height from the ground (m) Calculate the PE (j) using PE=mgh Example: M=2k g H=1.5 m PE mgh PE 2 9.8 1.5 29.4 J Kinetic Energy Energy of Motion Two Factors Mass & Velocity So… 1 2 KE mv 2 If I go twice as fast, how much does my KE increase? Mr. Simonson once got a speeding ticket for going 45 mph (20m/s) in his radical ‘86 transam, (m=1,500kg). My Kinetic energy should have been 181,500J, what was it? Ex Credit: what was the speed limit? Conservation of Energy Potential Energy Kinetic Energy It has always been around! Even before the big bang! Energy CANNOT be created Energy is never used up… Energy transfers from one object to another Energy CANNOT be destroyed! Energy Has NO kryptonite... Awesome! Conservation of Energy Energy is neither created nor destroyed, it merely changes form! PE transfers to KE & Vice Versa The total amount of mechanical Energy in the diagram below will always be 50,000 j. The energy levels of KE & PE change according to height & velocity… Find the energy value in the blanks for each scenario…