notes_ch02 - Ch 2 Scalars quantities that have only a...

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Ch. 2 • Scalars - quantities that have only a magnitude, no direction Examples of scalars time, distance, speed, mass, weight, work, energy, power, density, volume, temperature • Vectors - quantities that have magnitude and direction Examples of vectors displacement, velocity, force, momentum, impulse, acceleration, torque • Mathematical operations like addition, subtraction, multiplication work differently for Scalars and Vectors • Distance - the total distance you travel in a certain period of time • Displacement - the difference between your final position from your intial positioin and its direction • Speed - the total distance you travel ÷ a certain period of time (distance/time) Instantaneous speed ( S inst ) = (speedometer) lim t 0 d t Average speed ( s ) = d/t • Velocity = (Dislpacement / Time) Instantaneous Velocity ( V inst ) = (speedometer + compass) lim t 0 D t Average Velocity ( V ) = (Displacement/ Time) (i.e. - vector ÷ scalar = vector) S inst = V inst ││ x = means magnitude of x S V x = means average of x x = means x is a vector • Acceleration = how fast you are changing velocity Average acceleration ( a ) = V f - V i t Instantaneous acceleration ( a inst ) = lim t 0 v t (derivative = d v / d t ) Example #1 You walk 10 miles West in ½ hr. . Then you rest at Starbucks for 1 hr. . Then you walk 15 miles East in 5/4 hr. Assume constant speed during each stage. 15 miles in 5/4 hr 10 miles in 1/2 hr 1 hr. rest
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Example # 1 15 miles in 5/4 hr 1 hr. rest 10 miles in 1/2 hr Stage 1: 10 miles in 1/2 hours Rest for 1 hour Stage 2: 15 miles in 5/4 hours Assume constant speed during each stage!
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This note was uploaded on 06/27/2008 for the course PHYSICS 001 taught by Professor Kiledjian during the Spring '08 term at East Los Angeles College.

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notes_ch02 - Ch 2 Scalars quantities that have only a...

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