??>? CE?B?g???bjbj)) 4 xCy\xCy\ ?h h ????????8,H???\\\\\????????????@N??3?"?33???\\9?!6!6!63??\?\?!63?!6!68P8\Ws5?8??0?$8,@?@P8@?P84?Z@!6Q4????????L????3333@?????????h > ?:  cng n tp l?8 I. L?thuyt: 1. Chuyn ng c?hc l?g? Cho v?d? 2. ln ca vn tc c trng cho tnh cht no ca chuyn ng? Cng thc tnh vn tc? n v?vn tc? 3. Chuyn ng khng u l?g? Vit cng thc tnh vn tc trung bnh ca c/?khng u. 4. Lc c?tc dng nh?th?no i vi vn tc? Nu v?d?minh ha 5. Nu cc c im ca lc v?cch biu din lc bng vect? 6. Th?no l?2 lc cn bng? Nu trng thi ca vt khi chu tc dng ca 2 lc cn bng. 7. Lc ma st xut hin khi no? Nu 2 v?d?v?lc ma st. 8. Tc dng ca p lc ph?thuc nhng yu t?no? Cng thc tnh p sut. n v?tnh p sut 9. Vit cng thc tnh p sut cht lng v?my nn thy lc. Gii thch cc i lng v?n v?trong cng thc. 10. Vit cng thc tnh lc y csimt. Gii thch cc i lng v?n v?trong cng thc. 11. iu kin vt chm xung, ni ln, l?lng trong cht lng. 12. Vit biu thc tnh cng c?hc. Gii thch cc i lng v?n v?trong cng thc. II. Bi tp: Bi 1: Mi ngy bn An i hc lc 6h30', nu An c?i vi vn tc trung bnh 12km/h th?7h An s?n ni. Hm nay An xut pht mun hn mi ngy 10' nn phi tng tc n trng ng gi?n?mi ngy. Tnh vn tc trung bnh m?An t c. Bi 2: Lc 6h30' sng 1 ?t?i t?A-> B cch nhau 160km. Sau khi i c na on ng u vi vn tc 45km/h th??t?dng li ngh? na on ng sau xe tng tc v?t vn tc 55km/h, xe ti B lc 10h. Hi xe ngh?trong bao lu? Bi 3: Mt vt 0,5kg t trn mt sn nm ngang a, Hy biu din cc vect?lc t/d ln vt b, Vt c ko chuyn ng thng u trn mt sn nm ngang vi lc ko theo phng nm ngang c?cng 2N. Hy biu din cc vect?lc t/d ln vt. Chn t?xch 2N ng vi 1cm. Bi 4: Mt vt khi lng 0,84kg, c?dng hnh hp ch?nht, kch thc 8cm x 6cm x 5cm. Ln lt t 3 mt ca vt ny ln ln mt sn nm ngang. Hy tnh p lc v?p sut vt t/d ln mt sn trong tng trng hp v?nhn xt v?cc kt qu?tnh c. Bi 5: t 1 vt c?khi lng 60kg ln 1 ci gh?4 chn c?khi lng 4kg. Din tch tip xc vi mt t ca mi chn gh?l?8cm2. Tnh p sut cc chn gh?t/d ln mt t. Bi 6: Mt ng nh?hnh tr?c?chiu cao 100cm. Ngi ta thy ngn vo ng sao cho mt thy ngn cch ming ng 90cm. a, Tnh p sut ca thy ngn ln y ng. Bit TLR ca thy ngn l?136000N/m3 b, Nu thay thy ngn bng nc th?c?th?to ra p sut nh?trn khng? Bit TLR ca nc l?10000N/m3 c, Nu thay thy ngn bng ru th?c?th?to c p sut nh?trn khng? Bit TLR ca ru l?7800N/m3 Bi 7: Mt cn phng rng 5m, di 10m, cao 3m a, Tnh khi lng ca khng kh?cha trong phng. Bit khi lng ring ca khng kh?l?1,29kg/m3 b, Tnh trng lng ca khng kh?trong phng Bi 8: Treo 1 vt ?ngoi khng kh?lc k?ch?4,2N. Khi vt chm trong nc lc k?ch?3,6N. Tnh th?tch ca vt. Bit TLR ca nc l?10000N/m3 Bi 9: Mt vt khi treo ngoi khng kh?lc k?ch?2,1N. Nhng chm vt vo nc th?s?ch?lc k?l?,8N. Tnh TLR ca vt. Bit TLR ca nc l?10000N/m3 Bi 10: Mt vt c?TLR l?20000N/m3. Treo vt vo 1 lc k?ri nhng vt ngp trong nc th?lc k?ch?200N. Hi nu treo vt ?ngoi khng kh?th?lc k?ch?bao nhiu? Cho bit TLR ca nc l?10000N/m3.     #%IJKM??  S T ????( ) ????  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