PHYS 0110 Lecture 2: Physics Video Module 2
Document Summary
Position: represented by a vector, ~r that is drawn from the origin of the coordinate system to a point on the coordinate system. Displacement: a vector that points from the initial location to the nal location; the di erence between nal position and initial position. 2. 2 speed and velocity average velocity: the average rate of change in position per unit of time. Instantaneous velocity: the instantaneous rate of change at time t. Motion with constant velocity: displacement is proportional to elapsed time. x(t) = x0 + vt (1) (2) (3) (4) Acceleration with constant velocity: when velocity is constant, which means acceler- ation is zero. The acceleration vector ~a is always parallel to the velocity vector, ~v. Average acceleration: the change in velocity per unit of time. Instantaneous acceleration: the instantaneous rate of change of velocity. The e ect on speed: if acceleration and velocity vectors are pointing in the same direc- tion, speed increases.
