PHY 220 Lecture 2: Lecture 2
Document Summary
Represent the total amount of movement during a displacement. Or, just the magnitude of the displacement. Velocity is the rate of change of displacement. Velocity is non-zero whenever displacement changes either. Change in position over the whole time interval. Or, the velocity at any given moment. If the velocity is constant , these two are equal. Change in velocity over the whole time interval. The limit as t goes to zero. Or, the acceleration at any given moment. If the acceleration is constant , these two are equal. This will be the case most of the time in this class. Acceleration is the rate of change of velocity. It"s magnitude is how much the velocity changes. Relative directions determine whether speed increases or decreases. Acceleration is non-zero whenever velocity changes either. If acceleration is in the same direction as velocity. The object"s speed increases, direction of travel remains unchanged. If acceleration is in the opposite direction as velocity.
