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### 09

1. 1. Warm-Up, 09.22.2009 What is friction? Give two examples of friction you might experience every day. Quel est frottement ? Donnez deux exemples de frottement que vous pourriez éprouver journalier. ¿Cuál es fricción? Dé dos ejemplos de la fricción que usted puede ser que experimente diario.
2. 2. Notes: Gravity <ul><li>Gravity : attractive force between any 2 objects that depends on their masses and the distance between them. </li></ul><ul><ul><li>Gravity’s effect becomes weaker the further away you are from an object. </li></ul></ul><ul><ul><li>Earth’s gravitational acceleration (aka g ) = 9.8 m/s^2 </li></ul></ul>
3. 3. Gravity: Notes <ul><li>Weight: The gravitational force exerted on an object. Weight increases as mass increases. Weight is NOT mass. </li></ul><ul><li>Falling objects : </li></ul><ul><ul><li>Due to gravity, all objects have the same DOWNWARD acceleration. </li></ul></ul><ul><ul><li>Free fall: when all forces except gravity that are acting on a falling object can be ignored. </li></ul></ul>
4. 4. <ul><li>Centripetal Force: the force that pulls objects moving in a circle towards the center of that circle. </li></ul><ul><li>Centrifugal Force: the force that pushes objects moving in a circle away from the center of that circle. </li></ul><ul><li>Momentum = Mass x Velocity </li></ul><ul><ul><li>Law of conservation of momentum: </li></ul></ul><ul><ul><ul><li>The momentum of an object doesn’t change unless its mass, velocity, or both change. </li></ul></ul></ul><ul><ul><ul><ul><li>If it does, then some momentum is lost. </li></ul></ul></ul></ul><ul><ul><ul><li>total momentum does not change on objects interacting with each other . </li></ul></ul></ul><ul><ul><ul><ul><li>If they interact with something else, then some momentum is lost. </li></ul></ul></ul></ul>
5. 5. Notes, Chapter 5 <ul><li>Energy: the ability to do work. </li></ul><ul><li>Kinetic Energy: the energy caused by motion. </li></ul><ul><li>Potential Energy: stored energy due to position (ex: a book hanging from a string). </li></ul><ul><li>- Elastic potential energy (ex: stretching a rubber band) </li></ul><ul><li>- Chemical potential energy: energy stored in chemical bonds. </li></ul><ul><li>-Gravitational potential energy: energy stored in objects due to position above Earth’s surface. </li></ul>
6. 6. Notes, Chapter 5 & 10 <ul><li>Law of Conservation of Energy : Energy can only be converted, NOT created or destroyed. The total amount of energy in the universe does not change. </li></ul><ul><li>Wave: a repeating disturbance or movement that transfers energy through matter/space. </li></ul><ul><li>Medium: the thing that a wave transfers energy through. It can be a solid, liquid, gas, plasma, or space (or a combo of these). </li></ul>
7. 7. Test!!!!!!!
8. 8. Labs!!!!! <ul><li>Labs!!! </li></ul>
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