PHYS 152 Lecture Notes - Lecture 3: Electric Field, Net Force, Electric Potential Energy
Document Summary
Gravitational potential energy: objects lose gravitational potential energy when they fall down (u converted to k, observe that the gravitational force points towards lower u. Electric potential energy (u: electric force points towards lower u, f = mg = weight of object, electric field lines point towards lower u for positive charges and higher u for negative charges. Voltage = electric potential difference between 2 points have the same sign when q is positive: v and u e, v and u e have the opposite signs when q is negative. U vs v: electric potential energy (u): property of an object, analogous to gravitational u. = mg y: electric potential (v): property of a point in space, analogous to altitude = y. Equipotential lines: line of points with constant electric potential in a uniform electric field, equipotential lines are straight and perpendicular to electric field.