# Physics Test 2

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } equilibrium experiencing zero net force equilibrium position When nothing is pushing or pulling on the spring, and the free end is in equilibrium at a particular position stable equilibrium the end of the spring when it naturally returns to its equilibrium position if it is stretched or compressed Hooke's law The stiffer the spring and the farther you stretch it, the harder it pulls backF = -kxrestoring force = -spring constant x distortion spring constant k, measure of the spring's stiffness collision energy kinetic energy absorbed during the collision rebound energy kinetic energy released during the rebound coefficient of restitution coefficient of restitution = rebound speed of ball / collision speed of the ball vibrational node points near each end of the bat that do not move when the bat vibrates elastic collisions bounces so perfect that all of the collision energy is stored and returned as rebound energy inelastic collisions collisions that fail to return some of the collision energy as rebound energy centripetal acceleration "center-seeking"brings toward the center Nicolaus Copernicus 1473-1543Heliocentric theorystart of modern astronomydelayed publication of his book till the year of his death Galileo Galilei 1564-1642championed heliocentric universe by observationtelescope observations Johannes Kepler laws of planetary motionused data of Tyco Brahe as postulate motion of planets Kepler's laws 1. planet orbits = ellipses2. area swept fro the sun to a planet is constant in time (conservation of angular momentum, speeds up closer to foci)3. the bigger the orbit, the longer it takes the planet to go around its orbit geosynchronous orbit at 35,900km above the earth's surfaceorbits the earth every 24 hours, stays at same place above the earth .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } AuthorAnonymous ID239961 Card SetPhysics Test 2 DescriptionPhysics Test 2 Updated2013-10-10T22:01:48Z Show Answers