NGHIEN CUU & UNG DUNG NHONG UING DUNG CUA CAC KIEN T H O C VE CHUYEN DONG NEM TRGNG THUC TIEN ThS Mai Ngoc Anh Trudng DH Hdng DUrc Thanh Hod SUMMARY Throwing motion is a complex motion, the expression[.]
NGHIEN CUU & UNG DUNG NHONG UING DUNG CUA CAC KIEN T H O C VE CHUYEN DONG NEM TRGNG THUC TIEN ThS Mai Ngoc Anh Trudng DH Hdng DUrc - Thanh Hod SUMMARY Throwing motion is a complex motion, the expression of this motion is very diversity in life The motion of bullet leaving the barrel of a gun the motion of the missile launcher left and motion of tennis ball leaving the racket face, so on are all throwing motion Throwing motion lakes place complex, however the application ofthe knowledge of the throwing motion is widely applied to life, production andfight This paper we are pleased to present a summary of the basic knowledge about the throwing motion as welt as their wide applications in every aspect of human life Keyword: Chuyen ddng nem, dng dung Nh^n bdi ngify: 10/5/2014 NgAy duy^ dang: 23/5/2014 I MO DAU Chuyin ddng ndm ngang, ngm xign (ggi chung Id chuyin dgng nem) Id hai dgng chuyin ddng phd bien, thudng xay ddi sdng hdng ngdy Ddy Id hai dgng chuyin dpng phdc tgp vl nd bj chi phdi bdi nhilu nguygn nhdn khde nhau; nhu lyc hdt ciia Trdi Ddt vd sdc can eiia mdi trudng lgn chuyin dpng cua v^t Tuy nhign, nlu bd qua sdc can cua mdi trudng vd chi tfnh din lye hdt cua Trdi Dit tdc dyng lgn v^t thi chuyin ddng cua v^t sS dien don gian hon nhilu Chuyin ddng ndm diln rit phdc tgp nhung edc kien thdc lien quan din chuyin dpng lgi ed nhilu ung dyng ddi sdng, sdn suit vd ehiln ddu Dudi ddy chung tdi xin trinh bdy tdm tat nhttng kien thirc CO bdn vl chuygn ddng ngm cung nhu cdc ung dyng rpng rdi ciia ehdng dang diln ddi sdng hdng ngdy cua ngudi II NOI DUNG 2.1: Salugc vi chuyin dgng nim 2.1.1 Chuyen dpng nem xien: De nghien cihi chuyin dong nem xien truong hop chi tinh din trpng l\rc tac dyng len vat, nguoi ta thudng su dyng phuang phap tea dp Theo phuang phdp nay, chuyen dpng ciia vat dupe phan tfch th^nh hai chuyen dpng phan diln dong th6i theo hai tryc tpa dp Ox va Oy {cung ndm m^t phang nem) * Chuyin ddng diln theo trye Ox Id chuygn dOng thang dlu ed v§n tde, gia tie vd dudng di d thdi dilm t dugc xdc djnh: v^^ = v^ = V(j COS a = const a^=0 (1) X = V^J = VnCOSaJ * Chuygn ddng dien theo tryc Oy Id chuygn dgng ehgm din dlu cd vdn tdc, gia tdc, dudng di dugc xdc dinh; %=VoSina;a^=-g , V0V2 Vo=10,45(m/s)»10m/s (5) x^ 2%S t 3.05m 2Dm ""^ Thi dy 3: MOt mdy bay, bay ngang vdi v§n tic V, d dd cao h mudn tha bom trdng mpt tau ehiln dang chuygn ddng thing dlu vdi vdn tdc v^ cung mJt phing thing ddng vdi mdy bay Hdi mdy bay phdi edt bom nd edeh tdu chiln theo phuong ngang m^t 2.2 Mpt sd thi du vi nhitng irng dung cda cdc dogn / la bao nhieu? Xdt hai trudng hpp: kiin thue vi chuyin dpng nim a) May bay vd tdu ehiln chuyin dOng cdng Thi du 1: Mpt ngudi linh cuu hda dung cdch tda nhd dang chdy 50m, cam vdi phun nude ehleh chieu b) Mdy bay vd tdu chiln chuyin ddng ngupc mdt gdc a , so vdi phuong ngang Vdn tdc cua ddng nude luc idi khdi vdi Id 40m/s Hdi ngudi linh cdn chieu LiTQ-c gidi: hda cdn phai cam vdi nude eheeh mdt gde bao nhieu a) Trudng hgp mdy bay vd tdu chiin chuyen so vdi phuong ngang de ddng nude phun tdi dg eao ddng cimg chiiu: Id 20m cua tda nhd? Ldy g = 9,8m/sl - Phuong trinh C£> cua bom theo Ox vd Oy: Luoc gidi: , , X J x' x = V cosa.t=^ X = V,.t=>t=— ; y = - g t ^ = - - g _ 50 V, 2 V; = 1,443s t= v.cosa 40.0,866 y = Vo.sina.t—-gt => sina = ^ ^ ^ ^ = - = > a = 30" 2v„t T h i d u : Mpt cSu thu bdng rd ddng cdch xa rd 34 • TillP CHi THlflBI GIAO DMC-S6106-6/2014 - Vi tri bom trdng mue tidu Id tog dd x, cda bom: (1) - Phucmg trinh CD cua tdu chiln: x,=v,.t + I = v , ^ l = v , l | + l(2) NGHIEN CUU & UNG DUNG - E>l bom trdng muc tieu thi; x, = x^, tir (1) vd (2) suy ra: / = (V,-V;) ••y b) Trudng hgp may bciy vd tdu chien chuyen dgng ngugc chieu: - Phuong trinh chuyin ddng eiia tdu chign: X^ =l-V^X x = - v^sinacosa+v^cosai/v^sin'a-2gh = l~V2 n Tai B mudn tam xa BC ciic dai thi: P = 45" =>v = v „ = > v L = v J , Vdi: v^ = Vp.cosa = const = Vg cos^ a yl, = v j s i n ' a - g h 2h => vl cos^ a - v^ sin^ a = -2gh Thl dtf 4: Mpt chiln sj dgt sdng cli dudi mdt cdn him cd dd sdu h Hdi phdi d^t sung edeh mi|ng him mdt khodng / Id bao nhieu so vdi phuong ngang dl tim xa x eiia dgn trgn mat dit la Idn nhit? Tinh tim xa nay, bilt vdn tdc eua dan rdi ndng sung 14 V, Luffl: giai: Phtrcmg trinh cua dgn theo phuang Ox & Oy: X = v^J = Vo c o s a i => I = (1) • y = - - g t ' - f v , , t = - - g t = - l - ( v , s i n a ) t (2) gx" - + tana.x 2vl cos^ a X ,.( Trong dgy hpe vdt ly d trudng phd thdng, ta cd thl sd dyng thi nghiem ndy de khing dinh eho hpc sinh (HS) thiy ring chuyin dpng roi tu ed phuang thang ddng dgy bdi "sy roi tu eua vgt" v|t IJ 10 vd giai thich djnh tinh hi?n tupng xdy ra, vi?c cung cd kiln thdc cho HS bing thi nghigm sg gidp cho HS ddo sdu vd tin tudng kien thirc hem Trong dgy hpe v§t Iy dgi cuong d bge dgi hpc, ta ed the su dung thf nghiem ndy dg ddt vin de vao bdi cho cde bdi lien quan den chuygn dpng quay ciia v$t rin vd roi tu Thi nghiem cung cd thl dimg dl cung cl kiln thde cua sinh vign (SV) vl-mdmen quay, mdmen qudn tinh, v§n tdc, gia tdc chuygn ddng cua v§t Thi nghi?m ciing dupe su dyng nhu mpt dgng bdi t§p Ihi nghifm dl tim dilu ki$n vign bi roi vdo eh§u (tim bign dO gde a) Ngodi ra, SV cung cd thl v(ln dyng nhdng kiln thdc vl dpng hpc, dpng \\ic hpc dl gidi thich djnh tinh vd djnh lupng kit qua thi nghi$m Bp thi nghiem eung gdp phin kich thich tinh td md, hilu ki, hilu dpng cua (SV), tdng mde dp thd eiia S V gid hpe, giup SV ed tdm nhin phong phii, da dgng hon vl nhflng kiln thdc md giap vien (GV) va gido trinh cung cip Kit lu9n Ddy Id bd thi nghiem t\r tgo don gidn, de th\je hi$n, dl thdnh cdng nen GV cd Ihl td chuc hudng ddn cho HS, SV ty thiet kg vd tign hdnh thi nghi?m Kit qud thf nghifm dupe gidi thieh ehi tigt, rd rdng, ed dinh tinh Idn dinh lupng, giup eho GV, SV vd HS hiiiu rd ban chdt vd hi?n tugng vdt Ij? xdy thi nghi?m Bd thi nghiem ndy khdng nhChig gdp phin Idm phong phu, da dang thilt bi day hpe, md cdn Id mpt tdi li§u tham khdo bd Ich cho ca GV, SV vd HS Tdi li^u tham khao Luong Duygn Binh (2004), Vdt ty dai ctrong -rdp A NXB Gido dye Clemens Berthold (2006), Physikatische Freihand-experimenle, Aulis Verlag Deubner Trdn Thj Thanh Thu (2007), Khai thdc vd sit dung thi nghiem ty tgo dgy hgc phdn Co hgc Vdt li dai cuang, Lugn vdn thgc sT - Trudng DHSP Hul Trdn Thj Thanh Thu, Phdi huy linh lich cue vd sdng Igo ciia SV vdt li thdng qua ihi nghiem tu lao Tap chi Thilt bj giao dye, sd 78, thdng - 2012 Trin Thj Thanh Thu, Gidi ihi^u bg thi nghiim chuyin dgng quay ciia vgt rdn irong dgy hgc vgt ly dgi cuang, Tgp chi Gido dye Sd dac bi?t, thdng 12 -2012 TAP CHI THlfTBI GIAO DMC-SO 106-6/2014 • 31 ... Vgt li Idp 10 Ban co ban (Sdch thi diem) NXB Gido dye-2003 BO THI NGHIEIM MO TA rr/4,„.„,™„g«> Trong dgy hpe vdt ly d trudng phd thdng, ta cd thl sd dyng thi nghiem ndy de khing dinh eho hpc... vi?c cung cd kiln thdc cho HS bing thi nghigm sg gidp cho HS ddo sdu vd tin tudng kien thirc hem Trong dgy hpe v§t Iy dgi cuong d bge dgi hpc, ta ed the su dung thf nghiem ndy dg ddt vin de vao... li§u tham khdo bd Ich cho ca GV, SV vd HS Tdi li^u tham khao Luong Duygn Binh (2004), Vdt ty dai ctrong -rdp A NXB Gido dye Clemens Berthold (2006), Physikatische Freihand-experimenle, Aulis Verlag