Week 4 Notes with Terms
Week 4 Notes with Terms PHY 2048C
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This 0 page Class Notes was uploaded by Harrison Harward on Tuesday January 26, 2016. The Class Notes belongs to PHY 2048C at Florida State University taught by H. Prosper in Winter 2016. Since its upload, it has received 34 views. For similar materials see General Physics in Physics 2 at Florida State University.
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Date Created: 01/26/16
Force amp Motion Week 4 Notes PHY 2048C Notes Week 4 NOTE These are not exactly from the notes in class they are MY notes from class With terms de ned on the side Key TermsTopics The object or objects of current interest Everything outside of the system Pushes or pulls on a system exerted by the environment The sum of all the forces acting on the system Zero net force gt Zero Acceleration Nonzero net force gt Nonzero Acceleration Magnitude of force A on B magnitude of force B on A and forces are in opposite directions Science is possible because we are able to divide the world into 2 parts 0 System 0 Environment What makes science possible is the fact that we can investigate and try to understand the system without having to understand everything else The environment can exert pushes or pulls on the system otherwise known as forces Isaac Newton Aec seunsuug uo UJog 1791 I 99I apuquieg on 905 anel eeosa on SUJOL saog S 99I eanoo on sumqu L99I pauannd elpuud L89I 39 IDI SOLI Newton s laws of motion 0 1St law 0 Zero net force gt Zero Acceleration 2nOI law 0 Nonzero net force gt Nonzero Acceleration 3rOI law 0 Magnitude of force A on B magnitude of force B on A and forces are in opposite directions Newton s laws and acceleration You are currently sitting relative to the Earth 1 Are you accelerating Top Hat Question 2 Therefore is the net force on you zero or nonzero The point is that even if you do not know what forces are acting on you from Newton s laws you may conclude that the net force on you must be nonzero because you are accelerating towards the center of your latitude circle Class Problem Acceleratiun Class Problem Acceleration Doomsday 3 How short would the day have to be for Earth s gravity to lbe unable to hold an object on its sutfaee 1 What is the ttt cete39mtmn of an object in mfslj at the Earth s South Peleq 2 What is the acceleration of an object in Inf52 at the EarthaS Equam Hint The acceleration due to gramty at the Earth s surfsee is r g 93 mils2 R Z R Him The Earth s radius is 6400 km and the length ofthe day is 24 hours Tnpl lat Tonal lat Force amp Motion Week 4 Notes 0 the quantity of motion of a moving body measured as a product of its mass and velocity stands for mass stands for momentum a measure of a body s resistance to changes in velocity 0 the resistance of any object to any change in its a frame of reference that is not accelerating Newton s laws of motion Newton s 2nOI law can be written as Fji F quot Where the vector p mv is a measure Newton called the quotquantity of motionquot which today we call momentum The quantity m is called the mass Newton s 3rOI law can be written as r F 33 33 Which states that the force of A on B is of the same magnitude as the force of B on A and that the forces act in opposite directions The SI unit of mass is the kilogram kg The SI unit of force is the newton N kng39Z Inertia See de nitions on side 0 The greater the mass the greater the inertia and the greater a body s resistance to having its velocity changed Newton s laws of motion take their simplest form in the inertial frame of reference 0 Since the Earth spins on its axis everything that moves with the Earth is accelerating towards a point on its axis Consequently the Earth is not an inertial frame of reference However for short periods we can treat the earth as approximately inertiagtIlt o If the mass of the object does not change then 39 dr h EG I E Fixer Class Problem Net Form The magnitude of thc net force on a system comprising a 1200 kg truck and a 300 kg load is 300039 N l What is the net force on the system comprising the load only I39M ma 2 3000 N Tnpi at Force amp Motion Week 4 Notes Force amp Motion Week 4 Notes o The force that attracts a body toward the center of the earth or toward any other physical body having mass 0 The state or condition of physical touching o The resistance that one surface or object encounters when moving over another 0 The pulling force exerted by each end of a string cable chain etc o A region in a wave where the particles are closest together 0 The force that exists between charged particles 0 A force that arises between electrically charged particles because of their motion 0 A pair of equal and oppositely charged or magnetized poles separated by a distance 0 European Center for Particle Phygcs F0 rc e S 139 y s 1 V r 3 i H r Fundamental Forces Range of Fumes Strung ll Strung if m Mm Bmtis quarks to form protons and neutrons Binds quarks m form Fromm and neutmm E a iflv mma mi39c It 3935 Electromagnetic at a Bin EIECIWHS and nuclei l0 li n mmS Hinds electrons and nuclei to feml atoms 3 3 1 s Causes radioactivity of elements like Carbon l4 Causes radioactivity ot eiemenis like Uranium 394 LA Range CERN The at W t 3 ratita timtal Binds matter on planetary galactic and cosmic scales of forces irarila rianal a Binds matter on planetary galactic and cosmic scales Experiments demonstrate that in normal circumstances all macroscopic forces are the residual effects of the electromagnetic and the gravitational forces Consider the interaction between two particles a distance rapart of charge q and q As the charges are moved apart the strength of the interaction decreases like 1r2 Now consider the interaction between two dipoles The strength of the interaction decreases faster than it does for two charges Why On human scales residual electromagnetic forces dominate 0 However on planetary scales gravity dominates Why tophat ifquot U MAC 3 I rmnns p iun 5 omic hypothesis By con vent0n there is color By convention sweetness By con vent0n bitterness But in reality there are atoms and void Democritus 400 BCE Atomos quotindivisiblequot in Search refNames lnm lO39qm Dcwdrop 10 5 nm unawamm Emmy lDll39u Molecule 1 nm 39M U Atom l r39 nm quot W 5 7 Nucleus 10 nm a nnnnnnnnnnn 1min 233 1 Proton 1039 5 nm wP39m lamm J Quark lt1 l 39 39 mm amccuui nnnnnn mm uanUnn G ratriihr 7 Unification Uni cation of Frrrrdmrmmtri Forces urlg unit a w on T oooo genial Gamer G ravin Force amp Motion Week 4 Notes Gravity 0 See previous page 0 The Earth exerts a gravitational force on the moon and the moon exerts a gravitational force on the Earth of the same magnitude The force of gravity on an Newton s conundrum object o The two bodies are not in contact 0 So how can they act on each other Mass and Weight By de nition the weight of an object is the force of gravity on the object Experiments show that this force is given by w mg Where m is the mass of the object and g is the acceleration due to gravity 0 Near the Earth s surface its magnitude g 98 ms2 Note that the larger the mass the greater the gravitational force on a body Now suppose that gravity is the only force acting Then F me me MEI If gravity is the only active force all objects regardless of their mass have the same acceleration Summary The lg lldee quot Wide werlel inter a ee eee an the eerieeeeeem 39 rmly Hem Lenie ten the eyetem H E WT i 35 lL awe quot if the He farce w the eyetem ie zere en the la the aeeeletetieh quot if the net Feltee E the eyeteth ie henzeta 5e the is the aeeeleretien quot The intereetlln hemteen mire hf eahjeete eeneiete efepnesite feteee If i ii magnitude
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