09_dtvtgraphs - Lesson 9 d-t v-t Graphs Graphing the motion...

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Graphing the motion of objects gives us a way to interpret the motion that would otherwise be difficult. Graphs will also allow you to show a large amount of information in a compact way. Essentially you need to be able to sketch and interpret two main kinds of graphs in kinematics: 1. Displacement – Time Graphs Sometimes called d-t graphs, or position – time graphs. 2. Velocity – Time Graphs Sometimes called v-t graphs. Displacement - Time (d-t) Graphs This type of graph is based on the most basic things we need to know about the motion of an object (position and time). Typically you will be given a table of values that show the displacement of the object over a particular period of time. If the graph shows complex motion (such as Illustration 1 below), you do not just draw a single best fit line. Instead, you need to look at each section of motion and determine what kind of line best fits the data. Don't worry too much about sketching these complex situations. .. it is much more likely that you will draw an object moving in one way only. For the example graph shown below, imagine that you are running in a marathon, and we have decided to graph your movement. 7/22/2011 © studyphysics.ca Page 1 of 5 / Section 1.2 – 1.4 Illustration 1: d-t graph of a person running a marathon.
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Now lets look at a description of the person's movement in each of the major sections. Zero to 90s Look at how you are running in those first 90 seconds. Every 30 seconds you have moved about another 150m away from the starting point… you must be moving at a constant positive velocity! A constant positive velocity is shown on a d-t graph
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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09_dtvtgraphs - Lesson 9 d-t v-t Graphs Graphing the motion...

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