PHYS 1021 Lecture 1: Chapter 2

• School: Temple University
• Department: Physics
• Course: PHYS 1021
• Professor: Edward Gawlinski

Document Summary

2-1 reference frames and displacement: any kind of measurement regarding speed or distance but have a frame of reference, direction of motion must be specified. 2-2 average velocity: average speed: distance traveled/time, velocity includes magnitude and direction divided by time, average velocity: (final position initial position)/time, elapsed time is always positive. 2-3 instantaneous velocity: instantaneous velocity: average velocity over an infinitely small time period, though t approaches 0, it should not be set as 0, average velocity is the same as instantaneous velocity if objects travel at. This is not the same as a negative acceleration which inidcates direction. Instantaneous acceleration (a): the value of the average acceleration as t approaches 0. Ie the slope of the tangent line of the line in a graph of velocity vs time. 2-7 free falling objects: all free falling objects have constant acceleration, air resistance is usually negligible until the object is large and the velocity is large.