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Physics 151, Week two notes

by: Lindsey Notetaker

Physics 151, Week two notes PHYS151

Marketplace > University of Nevada - Las Vegas > Physics > PHYS151 > Physics 151 Week two notes
Lindsey Notetaker

GPA 3.585

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About this Document

Here are lecture notes, textbook notes, vocabulary from the book, and a couple websites that had flash cards of the equations to know for motion in space
General Physics I
Dr. Pang
Class Notes
Physics, motion
25 ?




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This 3 page Class Notes was uploaded by Lindsey Notetaker on Monday September 12, 2016. The Class Notes belongs to PHYS151 at University of Nevada - Las Vegas taught by Dr. Pang in Fall 2016. Since its upload, it has received 53 views. For similar materials see General Physics I in Physics at University of Nevada - Las Vegas.


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Date Created: 09/12/16
General Physics I-Week 2 Notes (September 5, 2016) Chapter 2: Motion in Space Lecture Notes  Motion is the most fundamental characteristic of nature  o Always look at what change in it occurred  Focusing on kinematics Look at things as a point particle and reference point  o Translational­ every point has exact same path Always need a ZERO point for time o Time can be negative depending where the zero is for it Displacement is the change in r o To find displacement you take the beginning location and subtract it from the end  location.  This is always absolute value meaning positive   If it is 2D or 3D always put it into component vectors and solve that way   The units are meters Elapsed time is the change in time o To find the elapsed time you take the beginning time and subtract it from the end  time. o The units are seconds  Velocity: the rate of position change  o Average velocity is (change in r)/(change in time) o Instantaneous velocity is the limit has the change in time gets closer to zero  (change in r)/(change in time) o Average speed is (total length of path)/ (change in time) o Speed is the square root of the components of the velocity   Speed is the magnitude  o Average acceleration is the limit has the change in time gets closer to zero  (change in velocity)/(change in time) o Acceleration is (change in velocity)/(change in time) o ALWAYS CONVERT VELOCITY UNITS INTO METER/SECONDS If acceleration is a constant vector, we have acceleration equal to (beginning velocity­end velocity)/(change in time) o Also beginning velocity equals end velocity + acceleration times change in speed  Displacement time relation: the change in x equals (end velocity of component x +  beginning velocity of component x)/ 2 times change in time Velocity displacement relation: velocity of component x squared equals 2 times  acceleration ties change in x Use what is given when solving problems Always checks signs, units, and magnitudes General Physics I-Week 2 Notes (September 5, 2016) Typically 3 significant figures When two objects have the same position you can say they caught up to each other   There are two answers with quadratic equations, so make sure you know which answer it  wants  Gravity is 9.80 meters/seconds squared  Projectile motion is when x and y are involved  o Time holds the x and y together  Choosing a simple zero helps a lot to make equations simple  Textbook Notes  Motion is the most fundamental characteristic of Nature because everything moves  Some motion we cannot physically see o Universe expanding   When comparing motion make something the reference point and place it on an xy or xyz plane  Break problem into smaller and simpler parts to make solving easy   Earth can be looked at as a point particle because the motion of earth is the same  throughout so to solve how fast or the position of earth, the other motion does not effect it  To find the position of something on a coordinate plane you plug in the points to the  square root of (x squared + y squared + z squared)  Time has been going for 13.7 billion years  o Since the Big Bang   Displacement can be positive or negative depending where the zero is  o If the displacement is negative, picture it as the object is moving behind the  starting point   Distance and displacement are not always the same   Average velocity= (displacement)/(elapsed time)  Speed= square root of (velocity of x squared + velocity of  y squared + velocity of z  squared)  Average speed= (total length of path)/(elapsed time)  Average acceleration=(change in velocity)/(elapsed time)  If acceleration is constant then you can solve it by adding the initial velocity with  (acceleration multiplied elapsed time  Problem­solving strategies o Picture the process involved and draw it in detail o Identify the given variables and unknowns o Choose the right coordinates o Use the most straightforward equation(s) General Physics I-Week 2 Notes (September 5, 2016) o Analyze the results   Check signs, magnitudes, figures, and units  Gravity is a constant (9.80 meters/seconds squared )  With projectile motion the object has a horizontal and vertical component o Both components are tied together by elapsed time  With free falling object there is only ONE component   Relative motion can be from comparing two objects   Websites that have the physics equations as flash cards  o­equations­with­acceleration­displacement­ velocity­acceleration­flash­cards/ o­equations­flash­cards/  There are some that we are not there yet for but good to have to be able to  look back  Vocabulary Words  Point: a mathematical abstraction of an object occupying zero dimension in space,  because the length scale involved in the motion of the object is much greater than the size of the object  Point Particle: when looking at something as it is a point and ignoring the motion of it  for the sake of studying its movement  Reference Frame: a set of coordinates fixed on the reference object to measure the  position of the object under study and a clock fixed in the coordinates  Time: a measure of causality; it allows us to record events according to their order of  occurrence  Displacement: change of the position of the object from one moment to another  Elapsed Time: difference between the two moments of time  Distance: the length of the path of an object   Average Velocity: average rate of the position change  Velocity: the rate of position change for a given moment  Speed: magnitude of the velocity  Average Speed: average rate of distance change of the object over a period of time  Average Acceleration: average rate of velocity change  Acceleration: change of velocity for the given moment and is a precise measure of what  is happening to the motion of the particle


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