http://www.directscience.info Featured article found on the homepage of DirectScience.Info Copyright 2006 Boyang Zhao Sun, 24 Sep 2006 08:21:04 EDT http://www.directscience.info/physics/equations_of_kinematics Equations of linear kinematics for constant linear acceleration can be used to solve physics problems. Five variables are concerned: x (displacement), a (acceleration), v (final velocity), v0 (initial velocity), and t (time). Sun, 24 Sep 2006 08:21:04 EDT http://www.directscience.info/physics/impulse Impulse is a vector quantity and is the product of the average force and the time interval during which the force is applied. The SI unit for impulse is Newton times s. Thu, 14 Sep 2006 21:18:03 EDT http://www.directscience.info/physics/restoring_force The restoring force is the force that a spring exerts back when a force is applied to the spring (according to Newton's third law of motion. Based on Hooke's law, restoring force is equal of the negative of the product of the displacement of the spring from its unstrained position and the spring constant. Fri, 01 Sep 2006 05:36:52 EDT