Thiết kế bài giảng vật lý lớp 12 nâng cao tập 1

TRAN THUY HANG HA DUY£N TUNG NANG CAO TAPMOT NHA XUAT BAN HA NOI ,,,i-'ft TRAN THUY H A N G « - H A DUYfiN TUNG •« THIET KE BAI GIANG cm T^rtlSMH ^ "iHt NANG CAO - TAP NfiA XUAT BAN HA NOI .ai not ddu Thie't ke bai giang Vat li 12 nang cao dvroc viet theo chifdng trinh sach giao khoa m6i ban hanh nam 2006 - 2007 Sach gidi thif u m6t each thi§'t ke bai giang VSt li nang cao theo tinh than doi mdi phifdng phap day - hoc, nham phat huy tinh tich ciTc nhan thiic cua hoc sinh Ve noi dung : Sach bam sat noi dung sach giao khoa VSt li 12 theo chifdng trinh nang cao O moi tie't, sach chi ro muc ti§u ve ki^'n thiic, ki nSng, c»c c6ng viec chuan bi ciia giao vi^n va hoc sinh, cac phtTOng tien ho trd giang day can thie't, nham dam bao chat Iifdng tufng.bai, timg tie't len Idp Ngoai sach co md rong, bo sung them m6t sd' ndi dung lien quan tdi bai hoc bang nhieu hoat dong nham cung cS'p them tu" lieu d6 cac th^y, co giao tham khao vSn dung theo do'i ttfdng hoc sinh tiing dia phiTdng Ve phifdng phap day hoc : Sach diTdc tri^n khai theo hvrdng tich cue hoa hoat ddng cua hoc sinh, lay cd sd cua moi hoat dong la nhiing viec lam cua hoc sinh dudi su" htrdng d i n , phvi hdp vdi dac trvmg mon hoc nhiT : thi nghif m, thao luan, thu'c hanh, nham phat huy tinh doc lap, tu" giac cua hoc sinh Dac bi^t, sach rat chii khau thu'c hanh timg bai hoc, ddng thdi ciing chi ro tung hoat ddng cu thg cua giao vien va hoc sinh mdt tiS'n trinh day hoc, coi day la hai hoat ddng ciing ca hoc sinh va giao vign la chu the Chiing tdi hi vong cud'n sach se la mdt cdng cu thie't thUc, gop p h i n hd trd cac thiy, cd giao giang day mdn Vat li 12 viec nang cao hif u qua bai giang cua minh Cac tac gia CHi/ONG DONG Ll/C HOC VAT RAN • • • • BAII CHUYEN D N G QUAY CUA VAT RAN QUANH M T TRUC c DESfH I - MUC TifiU V^" kien thtic - Hoc sinh hieu duoc khai niem vat rdn va chuyen ddng tinh tien cua vat ran la gi - Hoc sinh hieu duoc khai niem toa dp goc (p - Xay dung dupe cac cdng thiic tdc goc co, gia tdc gdc y - Nam viJng cac cdng thiic lien he giiJa tdc gdc va tdc dai, gia tdc gdc va gia tdc dai ciia mot diem tren vat rSn - Xay dung dupe cac phuong trinh ddng hpc ciia chuyen ddng quay - Van dung dupe eac cdng thiic ciia chuyen ddng quay deu, quay bie'n d6i diu de giai cac bai tap don gian Ve ki nang - Ren luyen cho hpc sinh kT nang sii dung phuang phap tuong tu de xay dung cac khai niem, cdng thiic cua chuyen ddng cua vat ran II - CHUAN BI Giao vien - Ve hlnh 1.1, 1.2, 1.4, 1.6 trdn gia'y kho AQ Hoc sinh - On tap lai phin ddng luc hoc chat diem b Vat li Idp 10 THPT Ill - THifiT Kfi' HOAT D N G DAY - HOC Hoat d o n g cua hoc sinh Tror giiip cua giao vien Hoat dong Kiem tra, chuan bi dieu' kien xuat phat Dat van de GV neu cau hdi kiem tra kie'n thiie cu - Neu khai niem vat ran - Chuyen ddng tinh tien la gi ? HS suy nghT ca nhan tim cau tra Idi HS nhan thiic dupe van de cua bai hpc - Viet phuong trinh chuyen ddng cua vat chuyen ddng thing bie'n doi deu Viet cdng thiic van tdc cua vat dd Dgt vdn de : Idp 10, chiing ta da xac dinh quy luat chuyfin ddng ciia vat ran chuyen ddng thang bie'n doi deu Bai hpc chiing ta di sau tim hieu va xac dinh quy luat chuyen ddng, tim mdi lien he giOa eac dai lupng dac trung cho chuyen ddng quay cua vat ran quanh true CO dinh Hoat dong Tim hieu khai niem toa goc HS quan sat hinh ve 1.1 tren kho gia'y AQ, suy nghT ca nhan tim eau tra Idi — Mdi diem tren vat vach mdt dudng tron nam mat phang vudng gdc vdi true quay, n kinh bang khoang each tir di6m de'n true quay, tam ciia quy dao nam tren true quay - Mpi diem ciia vat deu quay duoc cung mdt gdc cung mdt khoang thdi gian GV neu cau hoi de HS tim hieu khai niem toa dp gdc: - Xet.mdt vat ran bat ki quay quanh mdi tmc Az t d dinh (Hinh 1.1 SGK) Hay cho bie't dac diem ciia quy dao cua mdt di6m tren vat ran vat ran chuyen ddng va gdc quay ciia cac diem tren vat ran? Tro g i u p ciia giao vien Hoat d o n g cua hoc sinh : GV thdng bao: HS tie'p thu, ghi nhd ; - Quan sat tren hinh ve, vi tri cua vat tai mdi thdi diem se dupe xac dinh bang mdt gdc (p giira mat phang ddng P gin vdi vat va mdt mat phing cd dinh PQ Gdc

0 Hoat dong Xay dung khai niem toe goc trung binh va tdc goc tiic thdi GV neu cau hdi de HS xay dung khai niem tdc dp gdc: HS thao luan chung toan Idp j - Khi vat rin quay, su bie'n thien theo thdi gian ciia (p the hien quy luat chuyen ddng quay cua vat rin Hay tim mdt dai lupng dac trung cho miic dp quay nhanh hay cham eiia vat rin Dai lupng dd dupe xac dinh nhu the nao ? GV neu cae cau hdi gpi y: - Dai lupng dac trung cho miic dp | quay nhanh hay cham dupe xac : - Trong chuyen ddng thing, dai lupng nao dac trung cho chuyen ddng nhanh hay cham ciia vat ? Dai lupng dd dupe xac dinh nhu the nao? dinh bang thuong so —^ • At ' : - Tuong tu, chuyen ddng quay, ta cd the tim mdt dai lupng dac trung cho miic dd quay nhanh hay cham ciia vat rin dupe khdng ? - thdi diem t, toa dp gdc ciia vat la g) thdi diem t +At, toa dp gdc ciia vat la Hoat dong ciia hoc sinh Tror giup cua giao vien (p + A(p, dai lupng dac trung cho miic dp quay nhanh hay cham ciia vat rin dupe xac dinh nhu the nao ? GV thdng bao: - Dd chinh la tdc dp gdc trung binh j C0f^J = cua vat rin khoang thdi At gian At HS thao luan chung toan Idp - Tdc dp gdc tiirc thdi d mdt thdi diem t duoc xac dinh bing gidi han - GV yeu cau HS xay dung cdng thiic xac dinh tdc dp gdc tiic thdi va cho biet don vi cua tdc dp gdc ciia ti sd —^ A / tien dan tdi At co = hm i^

0 At - Don vi ciia tdc dp gdc la rad/s Hoat dong Xay dung khai niem gia tdc goc trung binh va gia tdc goc tiic thoi GV neu cau hdi de HS xay dung khai niem gia tdc gdc: - Hay tim mdt dai lupng dac trung cho su bie'n thien nhanh hay cham ciia tdc dp gdc Dai lupng dd dupe xac dinh nhu the nao? HS thao luan chung toan Idp - Dai lupng dac trung cho su bie'n thien nhanh hay cham cua tdc dp gdc dupe xac dinh bing thuang so Aco At GV neu cac cau hdi gpi y - Trong chuyen ddng thing, dai lupng nao dac trung cho sir bie'n thien nhanh hay cham ciia van tdc ? Dai lupng dd dupe xac dinh nhu the nao ? - Tuang tu, chuyen ddng quay, ta ed the tim mdt dai lupng dac trung cho Trd giiip cua giao vien Hoat dong cua hoc sinh su bie'n thien nhanh hay cham ciia tdc dp gdc dupe khdng ? - O thdi diem t, vat cd tdc dp gdc la co O thdi diem t + At, vat cd tdc dd gdc la (o + Ao) dai lupng dac trung cho sir bie'n thien nhanh hay cham cua tdc dd gdc dupe xac dinh nhu the nao? GV thdng bao: - Dd chinh la gia tdc gdc trung binh Ao) Yi^ = HS thao luan chung toan Idp - Gia tdc gdc tire thdi d mdt thdi diem t dupe xac dinh bing gidi han , , Aft) , , » cua tl so -J.- , , ,, , cua vat ran khoang thai At gian At - GV yeu cau HS xay dung cdng thiic xac dinh gia tdc gdc tiic thdi va cho bie't don vi cua gia tdc gdc , r, A r tien dan tOi At = Hm hay y = coit) ,v->o At -) - Dan vi cua gia tdc gdc la rad/s Gia tdc gdc tiic thdi ciia vat rin quay quanh mdt true d thdi diem t la dai lupng dac trung cho su bie'n thien ciia tdc dp gdc d thdi diem dd va dupe xac dinh bang gdi han , , ^, Ao) , , ,.- , _ cua tl so A t tien dan toi At Hoat ddng Xay dung cac phuong trinh dong hoc ciia chuyen ddng quay GV yeu cau HS phat bilu khai niem gia tdc gdc GV neu cau hdi de HS xay dung phuang trinh chuyen ddng ciia vat rin quay deu: Hoat dong cua h9c sinh Trg giup cua giao vi^n - Trong trudng hpp tdc dd gdc ciia vat rin khdng doi theo thdi gian thi chuyen ddng ciia vat rin la chuyen ddng quay d6u Toa dp gdc ciia vat d thdi diem / dupe xac dinh nhu the nao ? HS thao luan chung toan Idp GV neu cac cau hdi gpi y - Hay neu su tuang ling giOa cac dai lupng gdc chuyen ddng quay va cae dai lupng dai chuyen ddng thing? - Viet phuong trinh chuyen ddng ciia vat chuyen ddng thing deu Tuong tu rin quay diu la : (p = (pQ + cot, nhu vay chiing ta cd the vie't dupe dd q)Q la toa dp ban dau luc f = phuang trinh chuydn ddng cho vat chuyfin ddng quay diu nhu the nao ? Phuong trinh chuyen ddng ciia vat GV neu cau hdi de HS xay dung cac cdng thiic chuyen ddng quay bie'n doi deu: - Trong trudng hpp gia tdc gdc ciia vat rin khdng doi theo thdi gian thi chuyen ddng ciia vat rin la chuyen ddng quay bie'n doi deu Hay vie't cdng thiic xac dinh tdc dp gdc ciia vat d thdi diem t, phuang trinh chuyen ddng eiia vat rin, cdng thiic ddc lap vdi thdi gian chuyen ddng quay HS thao luan chung toan Idp - Cdng thiic xac dinh tdc dp gdc ciia vat chuyen ddng trdn bie'n doi deu tai thdi diem / la : co = coQ + yt 10 GV neu cac cau hdi gpi y: - Viet cdng thiic xac dinh van tdc ciia vat chuyen ddng thing bie'n doi deu tai thdi diem t, phuong trinh chuyen ddng eiia vat va cdng thiic lien he giira van tdc, gia tdc va dp ddi Hoat dong cua hoc-sinh Trd giup cua giao vien - Phuang trinh chuyen ddng quay bie'n ddi diu : - Tuong tu cac cdng thurc cua chuyen ddng thing bie'n ddi deu, hay vie't cac cdng thiic cua chuyen ddng quay

0) - Neu tdc dp gdc giam dan theo thdi gian thi chuyen ddng quay la cham din irB = 2.10"''cos2.10'';r r 3.10^; Bai Mach dao ddng L, C, = 712772 2;rVl0.10"^5.10"^ 2TT4LC'] Mach dao ddng L, C2 1 = 1125772 /2 = 2TTJLC^ 2TT^\0.\0'\2.\0-^ Mach dao ddng L va (C, mic ndi tilp vdi C2) Dien dung tuong duong la C /3 = 2.5 = I,43//7^ 2+5 C,C2 C,+C = 13317/2 2;rVZc 2;r7l0.10"^l,43.10~^ Mach dao ddng L va (C, mic song song vdi C2) /4 = 248 2TT^LiC]+C2) = = 6027/z 2TT\II0.10~\7.\0'^ Bie'uDI^MDi2 I-BAI TAP T R A C NGHlfiM 0,25 dilm/cau x 16 cau = diem II-BAITAPT^TLUAN Bai (3 dilm) Xac dinh gia tri E Xac dinh gia tri B Viet phuang trinh E Viet phuang trinh B Bai (3 diem) : o,5 dilm : o,5 dilm : i dilm : i dilm Xac dinh gia tri// Xac dinh gia tri/j Xac dinh gia tri/^ Xac dinh gia tri/, : 0,5 dilm : 0,5 diem : i dilm : i diem Xac dinh gia tri dd Idch pha Aq) : 0,5 diem 13 xay dung bieu thiic x = 2k + — "hon gia tri k iCIt luan vl sd cue tieu giao thoa : 0,5 dilm : 0,5 diem : 0,5 dilm MUC LUC Trang Ldi noi dau CHUONG I OQNG Ll/C HOC V A l R A N Bai Chuyen dgng quay ciia vat ran quanh mgt true c6 djnh Bai PhiTdng trinh ddnglirc hgc cue vat ran quay quanh mgt true CO dinh Bai Mdmen dgng Itrpng dinh luat bao toan mdmen dgng liTdng 23 Bai Ddng nang cua vat ran quay quanh mgt true cd' djnh 29 Bai Bai tap ve ddng lire hgc vat ran 34 Bai kiem tra chuang I 40 CHUONG II DAO DONG CO Bai Dao dgng dieu hoa 53 Bai Con lac ddn - Con lac vat If 64 Bai Nang luTdng dao dgng dieu hoa 73 Bai Bai tap ve dao ddng dieu hda 79 Bai 10 Dao ddng tat dan va dao ddng tri 86 Bai 11 Dao dgng cudng btfc Cong hi/6ng 91 Bai 12 Tong hop dao dgng 100 Bai 13 Thuc hanh : Xac dinh chu ki dao ddng cua lac don hoac lac Id xo va gia tdc trgng triTdng 106 250 Bai kiem tra chuang ll 110 CHUONG III SONG CO Bai 14 Sdng cd - phu-png trinh sdng 123 Bai 15 Phan xa sdng - sdng dCrng 132 Bai 16 Giao thoa sdng 140 Sa/77 Sdng am - nguon nhac am 148 Bai 18 Hieu irng Ddp pie 165 6a/79 Bai tap ve sdng CO 171 Bai 20 Thuc hanh : Xac dinh td'e dp truyen am 180 Bai kiem tra chuang III 186 CHUONG IV DAO DONG VA SONG DIEN TLT Bai 21 Dao dgng dien tir 200 Bai 22 Bai tap ve dao ddng dien ti/ 212 Bai 23 Dien tir tru-dng 218 Bai 24 Sdng dien tir 222 Bai 25 Truyen thdng bang sdng dien t i / 229 Bai kiem tra chuang IV 237 Muc luc 250 251 Thiet k§'bai giang V A T L I 12 - NANG CAO - TAP MOT TRAN THUY HANG - HA DUYEN TUNG NHA XUAT BAN HA NOI Chiu trdch nhiem xudt bdn : NGUYfiN K H A C O A N H Bien tap : PHAM QUOC TUAN Vebia : T A O THANH HUY^N Trinh bdy : CHU MINH Sda bdn in : PHAM QUOC TUAN In 1000 cuon, khd 17 x 24 cm, tai Cong ty TNHH in Ha Anh Giay phep xuat ban so : 217 - 2008/CXB/lOO k TK - 05/HN In xong va nop li/u chieu nam 2008 Sach lien ket v6i Cong ty CO phan In va Phat hanh sach Viet Nam • ••"iiiiiiiiif INPHAVI , ITlh Phat hanh tai Cong ty co phan In va Phat hanh sach Viet Nam 33.000 O Dia chi : 78 - Dong Cac - Dong Da - Ha Noi DT : (04) 5.11 5921 - Fax : (04) 5.11 5921 Gid: 33.000d