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PHYS 211 Lecture 02 Reading Guide

PHYS 211 Lecture 02 Reading Guide -...

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Lecture 02 Reading Guide (8/26/2011): 1D Motion Before we start to explain why things move they way they do, we will first start off by developing notation and vocabulary to describe motion. This area of physics is called kinematics (from the Greek word for motion). These important concepts will appear in the reading and learning kinematics involves understanding how all these concepts relate to one another: Origin and +/D directions of a coordinate system (How do you know these? Is it an arbitrary choice? Are some choices better than others?) Vector (what is special about a vector quantity?) Position Displacement (how is this related to position?) Velocity (how is this related to position? How is average velocity different from instantaneous velocity?) Speed (how is this different from velocity?) Acceleration (how is this related to velocity?) Be sure to study figure 2D5 to study the difference between average and instantaneous velocity ( Content Objective #1 ). Is it possible that a system is never moving at its average velocity for more than an instant? Is it possible that the object has a positive average velocity during an interval but a negative velocity during most of the time in that interval? Make a very careful study of figure 2D6 and be sure you understand (and could reproduce on your own) how to go from one graph to another one (e.g., from velocity to acceleration). This exercises captures the fundamental relationships between position (x), velocity (v), and acceleration (a) and is one of the really big ideas in this course ( Content Objective #2 ). Use Figure 2D6 to answer some questions: How would the velocity and acceleration graphs change if the position graph were shifted downwards by 10 meters (i.e., the initial position was at D10 meters, not 0). Between 8D9 seconds, the elevator cab is slowing down and the acceleration is negative. Can you think of a situation in which the elevator cab is slowing down but the acceleration is positive?
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