Physics 151, Week two notes
Physics 151, Week two notes PHYS151
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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 o https://quizlet.com/28212268/motionequationswithaccelerationdisplacement velocityaccelerationflashcards/ o https://quizlet.com/2523062/physicsequationsflashcards/ 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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