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Directions • ISN pg. 33- Kinetic & Potential Energy, book pgs.446-452 – Add to TOC • You only have to copy down what is in purple and the information on the 2 new formulas: KE and PE • When you complete the notes write your summary and look at the last slide for the next set of directions Energy and Work • Work- done when a force moves an object through a distance, a transfer of energy – Measured in joules (J) • Energy- the ability to do work – It is known by the changes it causes – Examples are sound and motion – Measured in joules (J) • 1 joule = 1 newton-meter • When work is done on an object, energy is transferred to that object Kinetic Energy • Kinetic Energy- the energy of motion – Comes from the Greek work kinetos, meaning “moving” – The kinetic energy of any moving object depends upon its mass and speed. Potential Energy • Potential Energy- energy that is stored as a result of position or shape – Stored energy gets converted into kinetic energy – You can store energy just by picking up a book and holding it. Let go, and that stored energy will turn into the kinetic energy of motion Gravitational Potential Energy • Gravitational Potential Energy- potential energy that depends upon an object’s height – The PE increases when an object is raised to a higher level – Depends on an object’s mass, height, and acceleration due to gravity (9.8 m/s2) Elastic Potential Energy • Elastic Potential Energy- PE of an object that is stretched or compressed – Said to be elastic if it springs back to its original shape after it is stretched or compressed – Can also be stored in objects that are compressed, such as springs – Broken rubber band: it’s elastic PE is converted into kinetic energy NEXT (directions) • On your interactive page 32, work out the “math practice” problems from your book on page 448 (SHOW YOUR WORK). ALSO, include pictures/chart/table/something demonstrating KE & PE – There are 3 problems on kinetic energy • When using the KE formula, ONLY velocity gets squared • I have worked out problem #3 on the next slide. When solving for velocity, some of you may have a more difficult time. Do the best you can. • If you look on page 449, you can see a worked PE energy problem • HOMEWORK: KE & PE math practice worksheet. Do the best you can. Show your work. Pay attention to the worked problems in your book. Use the formulas at the top of the page to help you. I will check for it. Math Practice • Problem #3: Step 1: plug your numbers into the correct spot in the formula Step 2: simplify by multiplying ½ and 50. this equals 25 Step 3: divide both sides by 25. this leaves you with 720 = v2. YOU HAVE TO GET RID OF THE SQUARE BY TAKING THE SQUARE ROOT. Step 4: the square root of 720 = 26.8 m/s