Centre of Mass PDF

Summary

This document discusses the concept of centre of mass, including calculations for different systems, like variable mass systems, and uniform rods and hemispheres. It includes derivations and equations for calculating the centre of mass in various physical situations.

Full Transcript

Cone omas Cewainvoaluonw or-Anaan momintum VaruiablL MAMAHatem dm- dv N oaAyshm a numb o parkels, Ao a pan Cw...

Cone omas Cewainvoaluonw or-Anaan momintum VaruiablL MAMAHatem dm- dv N oaAyshm a numb o parkels, Ao a pan Cwantng u entve has whue bekavi as s tha prnt and SHptem tentenbralnd a o tm m mouov mottn t UT dunubld Awms of u motun o- syatm Can ki Core o man Aysttm N baukoles o manis mas t Cemide aw1HK 0huvess YYY N An figo shnen ti o shnn Fig0) nive atiud aigm o T r Coubrond suptem otarrole o u The ThL Cehe o that ot mam Cavin hration vuew duine a bru w T t Y,t N N M frtal ma) o a sptem ThThu expema w lhe gtun veav oUa Censye omam (c.M) o astom porheles to venh N m Yi - roAn abo duhunihw, we draw two Cnelumms Ci) all t N hrhelun Rave a sane 4nas m N N N M=Nm N CN Conedw Ths npiyhak D e né enve Kpttm enre otm (i) weak huw or nk Attm N Th w u um ok h mauenb mami yphtm ab n Chre omax b uo. s condinalis o 9e ew a s Kawr N L 2 2 arhel. Cnhr oAA o arid bodu bodus ne a ung numb o SCaA 14d parked,madium hahen N ) a tight A mmakun bw hhnawn amd i onst nuas oLeen tnterahun ie torkt nuruy Ca h ekangad vetkw ou oparhele, u bcntun Asm n t e n an wnten An o mas wre o wh dm a,duhalFy may elm ( w n in hg) hunk o d n an nteyod, visualig Ahai ovome dv Jstated nan elmn Dhmam mam donm at r. aohtuw H n dm = dv ad elomint i , Tdv. Y mtyral enlnd a voum ib Tw tegrad Tw an a m r ad uin raollsy s o-e.H of-C.H and om ) Va dw dm d dn 7 dm dm 2 d = dm dm ervdinaln o &teuhal ma elumim dm ad Xem +Yo +2 Ycm Cenhre oa vuw daen i enbruman tv \hu pmtu Astew o badkelen M hae Rittounkahng t 0.r.t. tmu N H i Ve =P mininkun MM Vw As Cnhr otma and A velru ot Thn Hu vtn 1 bavtrel, velru h wapMtm h velsih oR-asyple»dot-pedrhelks lhi t t l h hi e M Onent Ve h.S. e g 2 ) i l tral inan mgmintun Th oenwtnalr u abstnti Jw Yenatnß lonat mOmUntum P 2 m 0; tor n k ensiof. srt u VYunaus and n e e H as ha ua eM b an Imhelm punr A absnes oerlnal absnel o eltnal Tw T h unthard n u vuluty Tenalns Konaradio atttve u l e p ub fd enanpA dos v eonan vebu, move tn ditfeu moviny A91 patkele phel, A bu he velou umb i&ipteaunt veiu its ma n a n m e diyuks Aeir Conbe o gpANtpdsg- stav_ Thetts k M G wp R k Imlonal tovee bueon a New ton A izd aw batttel oha syaem dhiy u fovUo ir TMatual Inlinthas bMotm Etk eultans e a t l behw TWin erlbnal 1e attung n ln Apkem, t ave a Vem F o a C.H sspm e bartelus mo ves Thu u erlot nal yanlrat a total mam and sena abplied a thu pn ve te F o n ), No wtung eirnad = d th CBskrn reaultnt enlornal tar hws hun Aave a m patreles Yemalnd etantF ie. n uomAntuN AhT e N ethu a Cemalnved n meh a a Mort L8h Cotant velsTih Cm O mn pli dephklvotun Tws kmth n Cnhre eGrav qrailakiend bauieles na ni owm aAsun o CaUlP Lhe Cerre a A AOmd emty idd, Core o ra (10) Calewdalcb eahye o mam (CH- Conhe o ma o wo bolhiolw P X- a s d omass MA Cenaielu a s4ptem oAO burcles d aMd M, Alpandted ey d antl eN. o u systen We Aave elullz 1uz and lk x -am als omqpn 0 a m, a nu 10nhg nd m and m an_gevenb ane_gvn Udimalus o Th Th (0,0,0), (d,0,o) pwvelz mt2 mam N The tt AiU bt a hm lhi C.H. dne O 2 en CAM two pantt ols u l n oun (IO Conre o mam oa wtYm sou gkt-so o A B X-ans lgu MandL l Aq mam and i uM Osiqtn a a L end o Yod akl k rod X-ann aling i longbk ohz od o d ana rod lautwten Ue elannt (dm) o- i an Conadev O n d ntdx 0 h on o f i Tod M long The mas 2 n unt d = M dx emen-b (,0,0). ohi &uT rod londindis e utCN o nd X-Lndinal The d == Xn d M i e.M e. M e nmdd nnaa lltt ot o 2 T s n d. Ond Y, 0,2-0) vod u at(X at(Xe T h eH oU 0 Cemhre omas oawnmtam Smi irtnlan wire M lo lh M a and R h -Rdo r a d i u o u Unsorm R6mo semicAra r e ORus X ive a A eLnhre o nds a X-a 0UnungJu two amd hu u aun ve md u Y-an n X-1 Xant heM. mus Rdt o aire ak an dnint o y& b oh m lnyh e d i n a l u n me) ( = Rer,, 7 R eire nu ntk o TR Th mam dm= M(RdA) Rdo) elonn JTR AL o =Hdg JT aCH nu Tu Cdinal Hd CRe) 0 d m JT M JT (R h t ) Mdo 2R JT JT oie at0, 2R ) AL C.N. h (101) 4 Conre s ma t a unem inieirtwla pla R 0 a sinieirenlonpadi , a A eCahre o a and iY-aww shaighF edga X-0 alg shauy ma and R u vaduuo of-ki KM b drad a n d n i id o Yodiwr and Yodiw d Y Cenidn l oTods aKd YHdr smieirnlM hi h) Can treaed rgion h a d a d ryion shodsd mh m his u Riknun dr dr No tye o elemnhol ALeirla Non oe fov lu aAki eH. o ARNUYulan| ah (105 NA nloa o h adsd yuiom e JTrr 2 2M T mas JTR TR T mas o smd nm Ye b MTdr dr, 2 m ITY JTR R b d t CH. We kwno kT nderulm i r hrd vegim 2 R 2H rdr dn R eeM M dr AR.4 3T M JTR Y 0 m Ound Xex = AUmitirwm pil b at Tw CH. o A ( 4 (oG) 55 onre o ma oaa1Uom Aolyd gomishonu aduus a D 0h 2-a no omipusu nb divid Ah radius r O als 'o sud eirtwan O hnn n que AbepA an ueh KuGn b h i t k n e be d h Onre oA otane ki ha Conve ot om d rcudan blali 0 G1= 24-a thiekun eirtnlan blut othieknun eirulan pluti ot voum o-IU N JTYd2=F ila )de dz omisskn omis4hnu t UI denila eirenlanXA L u g b eirm 'Tue maM d o0(a-z)d2 and 20 Xoz0 Ye t hae Thu 2d 2 T(a2)dz 2 20 2/5 Ta w Codrdinalus Conre omas Condre 0 man oRhnene alarhei t revgeu tHh aa bod bod. tyam tyam polurebs ot CH. a mo a piilim NAutu b stve Ru b Vey T h u) COAL a foo ^arhiels ilsbalin Byskom to1K uninal Condina t n ane eated AkT parhfeln and Har cH, and H a r eH -Y-2, and Y' a a r t mY2 wt 22 C o h omav We no w oadnal Mam O eere maN sadiral (108 osiens mR uskm ane supanakd Csvdinali Mm and old a veuw R b0nton vess ao o and W,r.tUnt mew tw0 in and m, 0ma&darala e Conhre ane Cve 0 OundY Y- R Y - R Cundinal h n he ma/o Jr Conbre e mas a tval l dm a 1% Cen 5nee o um Fwlkamae untrm mov cdn wn S w H esodumal Atem, Atem, o Csrdunalk 0 M CH m,Y=O m r+ divaety bonttk hrtiraT divuty trll3 So o b fiore oka AL mot o syakrn dvuablL man Motu o-a vuckeh hne, aw Cwla yms WhosL manA do ns bu vau remaln nandwuA Har motm wilk um Amaluaen ln betemn en n wiek n a' of ma tyrap Nuwto's laos blindl T mst dramati enaxplu et sa A Yotke povidis u pepelld b We kni Hat a rotkel- a Mm wiueh eaualy ttrud anan a t h n g bwntud aLilwaluy divwasn as Ah yotkeF Yoek Mot a vrke- u m Mrnlokung A rotke M o vvanuab a u a L l na uay a tt bas o u i baus ena b enblamed &n lhi Shmouw an Ahe prineuAlu marun and Nuom's Anvarun 3ra lao m o m i n t u m ekambr a embustuy tnkans owwwt. h L otkh yAlFAtgaal As a windn ni hawem Qa- oil Evdh an a u n teye er diveihn 0oeek Nh yoekel baek0 md 4a-1 n U tovu on IN turo a venttum @nd k panju axc dirtton When UTYoeket un UtW m a triwand ytkeF auduatug n U Rup tntn h a ane h n ahal duvesrm tkut+ q 1e) Astcen J OlbsenkLU aenlutnak kovtu hu trtal s R i n (rorket a-jet) mbment umm ewsnved yocket m dlaul, A wotum o nalyze a eanal Annal V momentum Vt4V+ N M V4V Tn tt4t t. bitwcen e nkntcal atm rocker, dm CPwidnw u (EF4E a may o f u l velsi lh n t t and an Aas-je Qnd npallud The erhawa bwnl relaiye a vtke. hu natm dliamimad b u Vlou i rotlung Ahe wplants tAvuluy ofreh , iy ndtptrdt ehens er. bu (16 above shw Suem a la and a tnt ttAt) T ayhm towavb O pus renan ma o K rotke H.Jene Mt4mn A veleeily Yotker a ime t i V Cnd a ns (t +4t), Vt4V The nittal Amowomfum (t) Mtm)v u) P(ttt) = MV4V)+4wVt4V+ Vt4V+b vedauy h ZaN -jet rlahve han n monUntwm T 4P P(th4t)-P(t HWsAV 4m4V + 4mu - M+M4V + 4m/v 4 O a limit s t o =M4v 4 (4m)u metnenun hue - () dP d 4t0 poaitve oslttve dumd u Ne thar m have 4 tonvenk mednvenmta hgarve, opoulk w V eanaBum. M Ln hT yolk m nd o-Ua mad. erkanst maM. AaNe oUu enkanst d L valiounUlAA yscket, rocke, mas Comis m n ie M d 1 aung th eae) m e aud equatng t edna t v t dP, oblaun Jatndaminad Tocke eanatm JN i ehhyAi all h veloidies Kowe blD nbresad Aber an mental trame U Yenent, nat a rin atehed oeke F aF YTckeh, takun a i veatn lasrm n e ma* he H dv F W dUuVA ohen O uT ina velau nal o Yke hare (ii yTcket ina yOaket n tye 9 tauun (11 ( i Rotke n Frce Spat 9A nA l n na tne en tm otkel aMA mottm vn ly M dM dv dM genual Qu ehaut veluy u must nm RehCaA b wy 0ntegrali enarum s moftm dv dt dM dv H V a l velouity v,=o -u n ab0ve UMAN Ay n velre TL mdepedut et lt, velaask o qnanhthi an tind veou Only mporlat an 4 An1e The Hu vo, ofi tal erhau -je veki u od maM (14 T Autuakun m oii dinunt a qwavr tarional ield An runt a houn hlku mt ename, (ti) Roke m a Ghalsi tahi bral Rdd a a reeke takes o CBaen geunatunal wd eaC) bLLms en dy d Hd M dv -u ae h and g diyted drAw and n anA owan dv wt te e get Smtegratvy t V M Vo h ( ) + 7 ) M ad V= t=o velsul w e k d Ku in tiad po five bwnd, 4ake velseu you

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