PHYS1001 Lecture Notes - Lecture 2: Greek People'S Liberation Army, Electronvolt, Conservative Force
67 views3 pages
Document Summary
Dynamics can be analysed using work and energy. It has an exact value, but it is very abstract. Potential energy: a type of energy an object has because of its position. Kinetic energy: energy an object possesses because of its motion. Work: work done is through some distance. Work done is along some direction we consider 0 work to have been done if something is pushed along a perpendicular to the direction of motion. Work done is the dot product of force and distance vectors. Friction does negative work by opposing motion. If we consider that work is done in several steps. Along a straight line, w = fscos . Work done is equal to the change in kinetic energy. Bullets have a high ke, the force is too great. If force varies with position (such as a spring) You can still apply f = ma. Probably easier to calculate integral of f ds.