XAY DUNG GIAO AN OIEN TU
DAY HOC PHAN KHAI NIEM VE MAT TRON XOAY
O ThS. O O V A N C H I E N *
V
iee irng dyng cdng nghe thdng tin (CNTT) nhieu ndm quo d trudng THPT Xudn Khanh dd ed budc tie'n bd quon trqng. Nhirng ndm ddu khi mdi trien khoi dp dyng CNTT vdo DH, mdt sd GV hieu ve gido dn dien tu Id soqn gidng tren mdy vi tinh, diing mdy chie'u thoy cho viet bdng; cung vdi su dyng cdc hieu irng dm thonh hoqc chqn phdng ehtr, trinh chieu,... Nhtrng viee dd ne'u su dyng khdng hqp If, se ldm phdn tdn su ehu y cuo ngudi hqc vd ddn de'n phdn tdc dyng, hieu qud DH khdng dqt duqe nhu mong dqi. Gido dn dien tu ed tdc dyng kich thich HS tieh cyc hqc tqp mdt edeh chu dqng hon. Gidm thieu hod tfnh triru tuqng vdn ed cuo mdn Hinh hqe khdng gion tdng hqp, tu dd cdc em d l hieu hon, hieu qud DH chuong ndy duqc ndng len rd ret. Tuy nhien, do dieu kien ve eo sd vdt chdt edn hqn che viec su dyng cdc phdn mem cd tinh ndng coo nhu tqo hinh dnh 3D sinh dqng md td mdt vd hinh trdn xoay chuo thye hien duqc. Mdt sd phdn mem miln phi thi khdng the tqo duqc mdt dudng eong bd't ki quay tqo vet de hqe sinh (HS) cd the d l hieu hon.De tfch cue hod hoqt ddng nhdn thire eho HS, bdi vie't gidi thieu gido dn irng dyng CNTT duqe thie't ke rieng tirng slide (xem hinh), vdi ndi dung, hinh ve duqe trinh bdy xud't hien Idn luqt vd ket ndi Iqi thdnh bdi gidng hodn ehinh.
(Cdc slides):
Slide 13
Slide 16
Slide 14
Slide 17
BH ^H|^H
^^Slide 20
Slide 15
Slide 18
HflRPHH
fHH
Slide 21Slide 25 Slide 26
Ndi dung bdi gidng duqe ehia thdnh 2 hoqt ddng (HO) chinh: H D I : Hinh thdnh vd cung ed khdi niem (KN) mat trdn xoay; HD2: Hinh thdnh vd cung cd KN mat ndn trdn xoay - duqc chio thdnh 4 hoqt ddng thdnh phdn (HOTP):
HDTPI: Hinh fhdnh KN mat ndn tron xoay;
HDTP2: Hinh thdnh KN hinh ndn frdn xoay vd khdi ndn frdn xoay; HDTP3: Hinh fhdnh KN vd cdng thuc finh dien fich xung quanh cua hinh ndn trdn xoay; HDTP4: Hinh fhdnh KN vd cdng thuc finh the tieh khdi non tron xoay:
Slide 7 Slide 8
Tap chi Giao duc so 2 2 5 (kii -11/2009)
"Tnrdng THPT Xuan Khanh, Ha Npi
#
HD cua GV HO cua HS Trinh chie'u HO 1: Hinh thanh, cung co KN mat tron xoay - Su tao thanh mat tron xoay
- Chieu mpt so vat the, vat dung nhu trong phan OVO. Yeu cau HS quan sat.
- GIdl thieu sy tao thanh mat tron xoay - Yeu cau HS thuc hien HDI SGK tr.31.
- Chieu mpt so vi du, yeu cau HS phan biet.
HO 2: Hinh thanh KN mat non Iron xoay H0TP1: Hinh tfianti KN mat non trdn xoay
- Chieu len bang hinh 2.3 va yeu c§u 1 HS doc to dinh nghTa SGK tr.31.
- Yeu cau HS tim cac yeu to co ban cua mpt mat non tron xoay?
- Yeu cau HS cho biet khi nao mpt mat tron xoay trd thanh mat non tron xoay?
- Xem SGK, quan sat hinh ve 2.2.
- Quan sat hinh ve tren bang.
- LTnh hdi siitao thanh mat trdn xoay.
- Lay mdt sd vi du de ciing co.
- Quan sat va tra Idi
- Thuc hien yeu cau ciia GV.
- Suy nghT, tra Idi cau hdi, tiep thu va ghi chep KN.
- Cac slide: 3, -Slides - Cac slide: 7, -Slide 11
Cac slide: 12, 4,5 8,9, 10
13
HDTP2: Hinh ttianti KN tiinh non tron xoay va khoi non tron xoay Giang giai. Goi mo, van dap HS, giiip HS lien he tdi
hinh da dien va khoi da dien
HDTP3: Hinh thanh KN va cong thiic tinh dien tich xur - Chieu slide 18, 19. Sir dung phat van, gpi md, van dap, giiip HS hinh thanh KN dien tich xung quanh cua hinh ndn tron trdn xoay.
- Chieu slide 20. Giang giai phat van HS de xay dung cong thirc tinh dien tich xung quanh ciia hinh ndn trdn xoay. (Yeu cau HS viet cdng thifc tinh dien tich tam giac can).
- Chieu slide 21 de HS nam them KN dien tich toan phan ciia hinh ndn, tir dd giiip HS md rpng KN.
HDTP4: Hinh thanh KN va cong thdc tinh thi tich ciia - Yeu cau HS dpc SGK tr.33 muc 4a ddng thdi chi§u slide 23. Giang giai giiip HS hinh thanh KN thd tich ciia khdi ndn trdn trdn xoay.
- Chieu slide 24. Giang giai, phat van HS dd xay dung cdng thi/c tinh the tich khdi ndn trdn xoay.
Quan sat tren phdng, tu duy va ITnh hdi.
g quanh ciia hinh non tron xoay - Tap trung suy nghTde ITnh hdi KN.
^ ' . : , j
- Chii y quan sat hinh ve, tU duy.
goi nhd cdng thirc da hpc de tra Idi cac cau hdi ciia GV.
- Tap trung suy nghT de (Tnh hdi KN md rdng cung nhu ciing cd KN vira tiep thu duoc
khoi non Iron xoay
- Thuc hien theo yeu cau ciia GV.
- Chii y quan sat hinh ve, tu duy.
gpi nhd cdng thifc da hpc de tra ldi cac cau hdi cua GV. Tap trung suy nghT de ITnh hdi KN md rdng.
Cac slide: 14,
-Cac slide: 18
- Slide 20
- Cac slide: 21
- Slide 23
- Slide 24
15, 16, 17
, 19.
22
HO 3: ciing co hoan thien kie'n thirc
- Yeu cau HS phan biet cac KN: mat ndn trdn xoay.
hinh ndn trdn xoay va khdi ndn trdn xoay.
- Sir dyng phat v§n, gpi md, van dap HS, giiip HS tra Idi diing cau hdi.
- Dua ra vi du SGK tr.34. Chia Idp ra thanh 2 nhdm.
mdi nhdm thyc hien giai mdt phan ra giay.
- Suy nghT va tra Idi cau hdi ciia GV, bang each lat lai kien thifc vifa tiep thu trong gid hpc.
- Tap trung van dung cac kien thifc vifa hoc de thuc hanh
- Cac slide: 14 va16
- Hoan chinh bdi slide 26
Khi hqc xong bdi 1: Khdi niem ve mat trdn x o a / c h u a n g II Hinh hqc 12 yeu cdu HS: - Ndm duqc su tqo thdnh mdt trdn xooy; cdc ye'u td cua mqt trdn xooy: dudng sinh vd tryc cuo mdt trdn xoay; - Hieu duqc mdt ndn trdn xooy duqc tqo thdnh nhu the ndo vd cdc yeu t d lien quon cuo nd: gdc d d i n h , tryc, dudng sinh; ddng thdi phdn
biet duqc cdc K N : mdt ndn trdn xooy, hinh ndn trdn xooy vd khdi ndn trdn xooy; - Ndm duqc cdc cdng thuc tfnh dien tich xung quonh cuo hinh ndn trdn xooy vd the tich cua khdi ndn trdn xoay;
- Hinh thdnh kT ndng tfnh dien tich xung quonh cuo hinh ndn trdn xoay vd the tieh cuo khdi ndn trdn xoay; - Phdt trien khd ndng tu duy logic, he
Tap chi Giao due s6 2 2 5 (ki i -11/2009)
thdng, vd tu duy truu tuqng, sdng tqo; - Biet nhdn xet bdi ldm cuo bqn cung nhu ty nhdn xet ddnh gid ke't qud hqc tdp eua bdn thdn; tich cue, chu dqng phdt hien, Itnh hdi tri thirc mdi, cd tinh thdn hqp tde trong hqe tdp.
Trong thuc te, nhieu vdt the, vdt dyng mdt ngodi ed hinh dqng mdt trdn xoay, nhu binh hoo, ndn Id, bdt dn com, cdc... nhtrng mqt hinh hqc, nhtrng vdt the dd duqe hinh thdnh nhu the ndo cung nhu mdt sd dqng ddc biet cuo nd ed ten gqi Id gi, thdng quo bdi hqc HS se tu tim duqc cdu gidi ddp (xem bieu trang ben).
Qng dyng CNTT vdo DH hqc phdn khdi niem ve mqt trdn xooy Id mqt yeu edu edn thiet ddp ung viec ndng cao ehdt luqng dqy vd hqc, DH bdng gido dn dien ti> dd mong Iqi su soy me
hirng thii hqe tdp eho HS. Tuy nhien, de ldm duqe dieu ndy GV edn cd kie'n thirc ehuyen mdn vung vdng; cd kie'n thirc ve CNTT, cd thdi gion chudn bj vd ddu tu cho bdi gidng, ed Idng yeu nghe,...
vdn dyng mdt cdch hqp li CNTT trong gidng dqy tqo dieu kien eho HS tinh hqi tri thirc trong hqc tdp vd nghien cuu khoa hqe dqt hieu qud coo. •
Tai lieu tham khao
1. Tran Van Hao (tong chu bien) - NguySn M6ng Hy - Khu Qud'c Anh - Tran Dire Huyen. Hinh hpc 12. NXB Gido due, H. 2008.
2. Tran VSn Hao (tong chu bien) - NguySn Mdng Hy - Khu Qud'c Anh - Tran Dire Huyen. Hinh hoc 12 (sach giao vien). NXB Gido due, H. 2008.
3. Website: baigiang.bachlcim.vn
Phat huy tinh tich circ...
(Tiep theo trang 28)
cuo tho Mdi so vdi tho eu tren thi ddn, bie't cdch phdn biet tho dieu ngdm vd tho dieu ndi.
Luyen tdp Id mdt thoo tdc su phqm nhdm kiem tra, ddnh gid, eung Id bien phdp de GV thu nhdn
«tfn hieu phdn hdi" ve ket qud tiep nhdn cuo HS.
Dqe d giai doqn ndy xdc dmh hieu qud tiep nhdn vdn hqc, de tdi hien todn bd he thdng hinh tuqng eua tdc phdm, cung cd d'n tuqng ve giqng dieu cua tdc gid vd khde sdu kie'n thuc. Den ddy, HS dd cd the tu dqe dien cdm vd ed the diln xudng dudi hinh thire ngdm (ddi vdi tho). Vdi nhqn thue san cd, hoqt dqng dqe Iqi giup «hinh tuqng tde phdm cd dieu kien duqe linh hqi khdng ehi d su do dien phong phu md cdn d chieu sdu cuo y nghlo tu tudng". Cdu hdi luyen tdp cua GV nen khoi dqy d HS ndng lye ddng cdm, ehieu sdu cuo
su cdm nhdn sou khi dd thyc hien cdc hoqt ddng hqc tdp tich cue khde. Chdng hqn, luyen top dqe dien edm ve «Thuang vg" cuo Trdn Te Xuong, GV ed the neu ro yeu edu: Em hdy hinh dung ra tdm trqng cuo «bd Tu" khi nghe Idi gidi bdy tdm su cuo «dng Tu"? Luo chqn hoqt ddng luyen top ndo mong Iqi hieu qud cdn tiiy thudc vd ddc diem vd yeu cdu rieng cuo mdi bdi hqc. Xdc dmh ddi tuqng vd vqn dyng linh hoqt cdc hinh thire luyen tdp mdi tqo ro hung thu sdng tqo d HS.Q (1) Ha Th^ Ngir - Dang Vu Hoat. Giao due hpc (tap 1).
NXB Gidodue,H.\991.
(2) Phan Trpng Luan. Ddi mdi giff hoc tac pham vSn chmmg 0" trutyng trung hpc pho thdng. NXB Gido duc,U. 1999.
Tai lieu tham khao
1. NguySn Trpng Hoan. Ren luyen tuduy sang tao trong day hpc tac pham van chuong. NXB Gido due, H. 2002.
Ngdy 2 9 - 3 0 / 1 0 / 2009, tgi TPHd Chi Minh, Cong dodn Gido dye (CCGD) Viet Nam dd td chiic HOI NGHI SO KET THI/C HIEN NGHI QUYET 5B CUA BCH TONG LOLO VIET NAM V^ M Y MANH CONG TAC BAO HO uio flONG (BHLfl) VA TAP HUAN VE CONG TAC BHLD NAM 2009.
Cdc thorn ludn dd phdn tich sdu ve cdc van de: Tiep tyc nghien cuu, ddy mgnh hogt
trong cdc ca id gido dye (CBGD
Viet Hom); Cong tdc on todn ve sinh lao ddng vd bdo ve mdi trudng d Viet Nom hien noy
(PGS. IS le ]/Q!) Trinh - Vien nghien ciiu KHKI BHLO); Cong tdc BHLC trong ngdnh GD-OT gioi dogn hien noy (PGS.TS Nguyen Phuc Khanh - Bo GD-OT); Nhirng vdn de trien khoi cdng fde BHLO theo NQ Ogi hgi X CflVN (NguySn Tmng San - Tong LOLO Viet Nam); Vol tid cuo td chi/c CC frong cdng tdc chi dgo vd td chiic hogf ddng BHLD (TS. Vu Tb! Thanh Binh-CBGD VielNam).
Thuc te ve cdng tdc BHLO the hien frong cdc bdo cdo cuo cdc CC ca sd: CO Tnrong CH
Vinh frien khoi thuc hien Nghi quyet 5B ciia Tdng LOLO Vief Nam (CD Tmimg DH Vinh); Ket qud thyc hien ket Nghi quyet 5B cua TLCLC Viet Nam ve cdng fde BHLO cua td chirc CC trong finh hinh mdi' (CD DH Nong Lam TP HCM); CO Tmdng OH Tdy Bdc td chuc fhye hien ket Nghi quyef 5B Clio TLOLO Viet Nam (CD Truong DH Toy Bk);
CO vdi nhiem vy ddy mgnh cdng tde BHLO - An toan ve sinh lao ddng (CD Tnmg DH Bach khoo
TP //fMA'Cdng tde BHLO tgi tnrong OH Lugf TP.
Wm (CD Tnmg DH Lugt TPHCM).
LE
