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### 09

1. 1. Warm-up, 09.18.2009 Draw and explain action/reaction force arrows for: 1) a box sitting on the ground 2) A person running Dessinez et expliquez les flèches de force d'action/réaction pour : 1) une boîte reposant sur le moulu 2) un fonctionnement de personne añol Dibuje y explique las flechas de la fuerza de la acción/de reacción para: 1) una caja que sienta en el de tierra 2) un funcionamiento de la persona
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>