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One-Dimensional Motion

One-Dimensional Motion. Physics Unit 2 Speed introduction. Describing motion is the aim of the area of physics known as kinematics . Key Terms Distance is how far an object travels (in total). Think of how an odometer reads milage .

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One-Dimensional Motion

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  1. One-Dimensional Motion Physics Unit 2 Speed introduction

  2. Describing motion is the aim of the area of physics known as kinematics. Key Terms Distance is how far an object travels (in total). Think of how an odometer reads milage. Displacement is a straight line from where an object starts to where it stops (an overall change in position). x-----------------------x Can these terms mean the same thing at times?

  3. Quantities used to describe motion are either scalars or vectors. Scalar values give the magnitude (numerical value) of a measurement. Speed is an example of a scalar (ie. 55 mph). Vector values give the magnitude and direction of a measurement. Velocity is an example of a vector (ie. 55 mph North)

  4. So we derive units of speed like miles per hour and meters per second to describe the motion of an object. As a formula, speed is calculated as v = d/t or velocity = distance/time Even though velocity technically needs a direction, it is often used as the preferred term in physics problems instead of speed.

  5. Speed can primarily take two forms • Instantaneous speed – speed travelled at a particular instant in time. The speedometer of a car gives speed at that time. • Average speed – total time travelled over a given distance. A 300 mile trip finished 4.5 hours would yield an average speed of approximately 67 mph.

  6. Copy the following website address: • http://www.physicsclassroom.com • This site will serve as a supplement to help you to better understand the concepts we will be studying in this course. • Our current unit of study includes 1-D motion and Newton’s Laws of Motion which can be found in the tutorial sections of the website.

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