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Representing Motion Chapter 2

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Important Terms Scalar: quantities, such as temperature or distance, that are just numbers without any direction (magnitude) EX: 15 m, $5.50, 98° Vector: quantities, such as position, that have both magnitude and direction EX: 15 m North, - 5 ft, 4 cm down

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Distance: a scalar quantity that describes how far an object is from the origin Symbol: “x” or “y” Units: m (meters) Displacement: a change in position having both magnitude and direction; it is equal to the final position minus the starting position Symbol: “Δ x” or “Δ y” Δ (delta) :“change in” Units: m How far?

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EX: Joey runs 400 m around the track and finishes exactly where he started. What is Joey’s: (a)distance traveled? (b)displacement?

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How fast? Speed: distance traveled in a time interval (scalar) Symbol: v Units: m/s (meters per second) Velocity: displacement traveled in a time interval (vector) Symbol: v Units: m/s

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Representing Motion

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Particle Models Object moves with constant velocity (speed) for 4 seconds.

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Graphing Particle Models Time (s) Distance (m) 00 110 220 330 440

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