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by: Emma Shoupe

65

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4

# Week 1 - August 16, 18 PHYS 1500

Marketplace > Auburn University > Physics > PHYS 1500 > Week 1 August 16 18
Emma Shoupe
AU
GPA 3.7

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These notes cover classes from Tues, August 16, and Thurs, August 18.
COURSE
General Physics I
PROF.
TYPE
Class Notes
PAGES
4
WORDS
KARMA
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## Popular in Physics

This 4 page Class Notes was uploaded by Emma Shoupe on Thursday August 18, 2016. The Class Notes belongs to PHYS 1500 at Auburn University taught by in Fall 2016. Since its upload, it has received 65 views. For similar materials see General Physics I in Physics at Auburn University.

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Date Created: 08/18/16
Physics 1500 Week of August 14, 2016 Dr. Hebert Physics  Units o Study of the fundamental laws of the universe o Without units, most numbers in physics are meaningless  Example: weight o SI units – units give scale o Fundamental qualities of nature have fundamental units  Length o Distance between two points in space o Meter (m) o 1 m approx. 3 feet  Time o Physical quantity at a constant pace  Steadily marches forward o Seconds (s)  Mass o Fundamental measure of how much stuff makes up an object o NOT THE SAME as weight o “if you travel to the moon, mass is the same as earth, however, weight will be different” o kilogram (kg)  Prefixes o SI makes comparison easy o Table 1.4 in book o Nano, micro, milli, centi, kilo, mega  Derived Units o Combination of fundamental units (density, speed) o Some have names (Newtons, Joules) o Can have prefixes  Dimensional Analysis o Natural ideas that are represented by units o Used to make sure our units match what we expect  Unit Conversion o Can be treated like algebraic quantities  Example: Moving 30 mph, how fast is speed in feet per second? August 18, 2016  Motion in One Direction o Position – where an object is in space relative to some reference point o Reference point- origin of a coordinate system o Position changes as it moves (in motion) o Over a time interval, a moving object covers some distance (path length)  Distance is always added, regardless of direction o After some time interval, a moving object may have been displaced through some displacement  Displacement doesn’t care about the path taken, only starting and ending point  Scalar Quantities v. Vector Quantities o Vector quantities- specify both a magnitude and a direction  Example: position and displacement  In one dimension, direction denoted with a + and – o Scalar quantities- only numerical, no direction  Example: direction and mass  Velocity and Speed o Also useful to compare time interval that passes as something travels through some distance d o combined as a ratio it becomes average speed (V avg) o average speed and average velocity are NOT the same thing o average velocity is a vector quantity o average speed is a scalar quantity o both velocity and speed have units m/s  Position – Time Graphs  Time- independent variable on the x axis  Position – dependent variable on the y axis  Average velocity is slope of a line connecting two points on a position – time plot  Instantaneous Velocity and Speed  Reduce time interval over which we’re taking our average to get a better guess  Can be done a lot making the time interval very small  Instantaneous velocity- slope of the line tangent to the position- time graph at a given time  Instantaneous speed- magnitude of instantaneous velocity  from now on, speed and velocity will be refered to as instantaneous unless specified  Example problem solved:  Acceleration  Velocity and speed are not always constant  Acceleration tells us how velocity is changing and is defined similarly to velocity  vector quantity- so it has magnitude and direction  units – meters per second squared  dimensions – length per time squared  acceleration and velocity are not necessarily the same direction  velocity- time graph – average acceleration is the slope of a line connecting two points on the graph and instantaneous acceleration is the slope of the line tangent to the graph at a given point in time  Object Under Constant Acceleration o If we assume acceleration is constant, from the definition of acceleration we can find an expression for the velocity at any future time o If acceleration is constant, velocity increases (or decreases) linearly in time o Average velocity, then is the mean of starting and ending velocities  4 IMPORTANT EQUATIONS CALLED KINEMATIC EQUATIONS o ONLY FOR CONSTANT ACCELERATION o Usually will need to combine use of the four equations in a problem o No mention of mass EXAMPLE PROBLEM

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