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September 15, 2016 Chapter 2 – Motion Section 1 – Describing Motion Reference Point – starting position Motion – change in an object’s position relative to a reference point Frame of Reference – a coordinate system in which the position of the object is measured > Graph Glenco Physical Science 2012 September 15, 2016 Change in Position Meter(m) – SI unit for distance Distance – how far traveled Displacement – the distance and direction of the object’s change in position Sample problem: Steve runs 75 m west and then turns around and runs 50 m east. How far is he from his starting point? How far did he run? September 15, 2016 Adding Displacements Always add head to tail... http://www.motherjones.com/environment/2011/10/ringling-bros-elephant-abuse 1. Same direction 2. Opposite directions 3. Not same nor opposite September 15, 2016 Speed – the distance an object travels per unit of time d s= t A bike traveling at a constant speed covers a distance of 500m in 75s. What is the bike’s speed? Constant speed – traveling the same rate for a given period of time Changing speed – speed varies over the trip Average speed – total distance traveled divided by the total time Instantaneous speed – how fast the object is moving at a single point in time Mini lab page 48 September 15, 2016 Glenco Physical Science 2012 What is represented on the x-axis? What is represented on the y-axis? How is speed represented on this graph? *Remember that a constant slope = a constant speed September 15, 2016 Homework: P 47 # 1-3 P 50 # 6-10