PHYS 221 Study Guide - Quiz Guide: Algebraic Number Field, Net Force
Document Summary
*only the component of the force parallel to the displacement does any work: work done by a constant force: Force do positive work on an object if they have a component that points in the same direction as displacement of the object. Forces do positive work on an object if they have a component that points in the opposite direction as displacement of the object. Forces do zero work on an object if they are perpendicular to the displacement of the object: work done by gravitational force: * y= vertical displacement: object moving down, f and r point in the same direction, object moving up, f and r point in the opposite direction, wg>0, =-mg y and y<0, wg<0, =0-mg y+0 and y>0. Wg= mg h: work done by a spring, equilibrium: where net force is zero, the farther the spring is pulled away from the equilibrium, the larger the force exerted by the spring.