SG_Chap2 - Chapter 2 Motion in One Dimension Motion: an...

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1 Chapter 2 Motion in One Dimension Motion: an ingredient in everything in physics. Depends on displacement, velocity and acceleration 2.1 Displacement 2.1 Displacement • Defined as the change in position • f stands for final and i stands for initial – May be represented as y if vertical – Units are meters ( m ) in SI, centimeters ( cm ) in cgs or feet ( ft ) in US Customary fi x x x
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2 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 Position of car at various times
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3 Vector and Scalar Quantities • Vector quantities need both magnitude (size) and direction to completely describe them ( number and sign ) – 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 ( only number ) 2.2 Velocity • 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 • Speed and velocity
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4 • 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 Velocity • It takes time for an object to undergo a displacement • The average velocity is rate at which the displacement occurs • generally use a time interval, so let t i = 0 fi average xx x v t t t
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SG_Chap2 - Chapter 2 Motion in One Dimension Motion: an...

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