Physics 101 Lecture 2 - Chapter 2 Motion in One Dimension...

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Chapter 2 Motion in One Dimension Dr. Armen Kocharian
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Dynamics ± The branch of physics involving the motion of an object and the relationship between that motion and other physics concepts ± Kinematics is a part of dynamics ± In kinematics, you are interested in the description of motion ± Not concerned with the cause of the motion
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Quantities in Motion ± Any motion involves three concepts ± Displacement ± Velocity ± Acceleration ± These concepts can be used to study objects in motion
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Brief History of Motion ± Sumaria and Egypt ± Mainly motion of heavenly bodies ± Greeks ± Also to understand the motion of heavenly bodies ± Systematic and detailed studies ± Geocentric model
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“Modern” Ideas of Motion ± Copernicus ± Developed the heliocentric system ± Galileo ± Made astronomical observations with a telescope ± Experimental evidence for description of motion ± Quantitative study of motion
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Position ± Defined in terms of a frame of reference ± One dimensional, so generally the x- or y-axis ± Defines a starting point for the motion
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Displacement ± Defined as the change in position ± ± f stands for final and i stands for initial ± May be represented as Δ y if vertical ± Units are meters (m) in SI, centimeters (cm) in cgs or feet (ft) in US Customary fi xx x Δ≡
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Displacements
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Vector and Scalar Quantities ± Vector quantities need both magnitude (size) and direction to completely describe them ± Generally denoted by boldfaced type and an arrow over the letter ± + or – sign is sufficient for this chapter ± Scalar quantities are completely described by magnitude only
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Displacement Isn’t Distance ± The displacement of an object is not the same as the distance it travels ± Example: Throw a ball straight up and then catch it at the same point you released it ± The distance is twice the height ± The displacement is zero
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Speed ± The average speed of an object is defined as the total distance traveled divided by the total time elapsed ± Speed is a scalar quantity = = total distance Average speed total time d v t
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Speed, cont ± Average speed totally ignores any variations in the object’s actual motion during the trip ± The total distance and the total time are all that is important ± SI units are m/s
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Velocity ±
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This note was uploaded on 03/05/2011 for the course PHYS 101 taught by Professor Armenn.kocharian during the Fall '10 term at California State University Los Angeles .

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Physics 101 Lecture 2 - Chapter 2 Motion in One Dimension...

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