CAS PY 211 Final: PY211 Final Study Guide
Document Summary
Work kinetic energy theorem: k = wnet (units = j) Work involves the component of the force that is parallel to the displacement. Two ropes are used to lower a steel beam a distance m at constant speed. There are three forces (t1, t2 ad fg), so three components of work. Car driving up a hill at constant speed. Total work done on car by all forces as it moves up hill is 0. Pav = w/ t (units = w (j/s): the rate of energy transfer. Kinetic and energy: depends of mass and speed of object: k = mv2, k = mv2 (unit = j (kgm2/s2)) Work and potential energy: depends on the mass and position of object: ug = mgh (unit = j (kgm2/s2), conservative force: if the work is independent of the path taken. Potential e for this force: u = -w.