Kinematics

__**Some Key Points - Source Dolores Gende**__
 * The study of Motion without considering its cause.**

**1. Distance is the total length that an object in motion covers. Displacement is a** **vector quantity that indicates the change in position that an object moves in a** **particular direction. Average speed is the distance covered per unit time. Average** **velocity is the displacement divided by the time interval.** **2. Acceleration occurs whenever there is a change of speed or direction of motion.** **3. Free fall problems can be solved like other acceleration problems by substituting** **'a' for 'g' = 9.8m/s/s .The sign of 'g' is (+) or (-) depending on the choice of up** **or down as the positive direction.** **4. A ball rolled off a horizontal table will take the same amount of time to hit the ground as another dropped from the same height.** **5. Projectile motion:** **a. horizontal and vertical components are independent,** **b. the horizontal component of the velocity remains constant, the vertical** **component has constant acceleration 'g',** **c. only the vertical component of the velocity at the maximum height is zero.** **d. for projectiles fired at an angle you may assign negative signs to all vectors** **going down.** __**Key Equations**__ = = __**Useful Sites** __ Physics Classroom (1-D Motion) [] Physics Classroom (2-D Motion) [] (See Lessons 1 and 2) PHET Simulation 1 [] (Projectile Motion Launcher) PHET Simulation 2 http://phet.colorado.edu/en/simulation/vector-addition (Vector Addition) PHET Simulation 3 Lady Bug Motion 2-D (2-D Motion) PHET Simulation 4 http://phet.colorado.edu/en/simulation/moving-man (Graphing for 1-D Motion) Projectile Motion Demo http://teachertech.rice.edu/Participants/pschweig/projmotdemo.html (Possible Projectile Motion Project) Physics of Projectile Motion [] Projectile Motion [] Projectile Motion http://www.youtube.com/watch?v=-yxDgwsA2Io (YouTube Explantion - not too tasteful) Projectile Motion http://www.youtube.com/watch?v=rMVBc8cE5GU&feature=related (Tutor Vista Demo)

=__**Relative Motion**__=