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  1. 1. Warm-Up, 09.17.2009 A bullet is dropped from the same altitude and at the same time as an identical bullet is fired horizontally from a gun. They both hit the ground at the same time. Which bullet will hit first if one is fired at an upward angle at the same time the second is dropped? Une balle est lâchée de la même altitude et en même temps qu'une balle identique est mis le feu horizontalement d'un pistolet. Ils tous les deux ont frappé la terre en même temps. Quelle balle frappera d'abord si on est mis le feu à un angle ascendant en même temps que le deuxième est laissé tomber? Una bala se cae de la misma altitud y al mismo tiempo que una bala idéntica se enciende horizontalmente de un arma. Ambos golpearon la tierra al mismo tiempo. ¿Qué bala golpeará primero si uno se enciende en un ángulo ascendente al mismo tiempo que el segundo se cae?
  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>