Giaựo vieõn bieõn soaùn: Dửụng Baự Quyứnh Trang 1 ễN TP DAO NG C + SểNG Cõu 1: Phng trỡnh ta ca mt cht im M dao ng iu hũa cú dng: x = 6sin(10t - ) (cm). Li ca M khi pha dao ng bng 6 l A. x = 30 cm B. x = 32 cm C. x = 3cm D. x = -30cm Cõu 2: Mt con lc n cú chiu di 1 dao ng iu hũa vi chu kỡ T 1 = 1,5s. Mt con lc n khỏc cú chiu di 2 dao ng iu hũa cú chu kỡ l T 2 = 2 s. Ti ni ú, chu kỡ ca con lc n cú chiu di = 1 + 2 s dao ng iu hũa vi chu kỡ l bao nhiờu? A. T = 3,5 s B.T = 2,5 s C.T = 0,5 s D.T = 0,925 s Cõu 3: Chn phỏt biu ỳng trong nhng phỏt biu sau õy. A. Khi cht im qua v trớ cõn bng thỡ vn tc v gia tc cú ln cc i. B. Khi cht im qua v trớ cõn bng thỡ vn tc cc i v gia tc cc tiu. C. Khi cht im n v trớ biờn thỡ vn tc trit tiờu v gia tc cú ln cc i. D. Khi cht im n v trớ biờn õm thỡ vn tc v gia tc cú tr s õm. Cõu 4: Phng trỡnh dao ng iu hũa ca mt cht im M cú dng x = Asin t (cm). Gc thi gian c chn vo lỳc no? A. Vt qua v trớ x = +A B. Vt qua v trớ cõn bng theo chiu dng C. Vt qua v trớ x = -A D. Vt qua v trớ cõn bng theo chiu õm Cõu 5: Mt vt cú khi lng m treo vo lũ xo cú cng k. Kớch thớch cho vt dao ng iu hũa vi biờn 3cm thỡ chu kỡ dao ng ca nú l T = 0,3s. Nu kớch thớch cho vt dao ng iu hũa vi biờn 6cm thỡ chu kỡ dao ng ca con lc lũ xo l A. 0,3 s B. 0,15 s C. 0,6 s D. 0,423 s Cõu 6: Phng trỡnh ta ca 3 dao ng iu hũa cú dng: Kt lun no sau õy l ỳng? 1 2 3 2sin ( ); 3sin( ) ( ); 2 cos ( ) 2 x t cm x t cm x t cm A. x 1 , x 2 ngc pha. B.x 1 , x 3 ngc pha C. x 2 , x 3 ngc pha. D. x 2 , x 3 cựng pha. Cõu 7: iu no sau õy l sai khi núi v nng lng trong dao ng iu hũa ca con lc lũ xo? A. C nng ca con lc lũ xo t l vi bỡnh phng biờn dao ng. B. Cú s chuyn húa qua li gia ng nng v th nng nhng c nng c bo ton. C. C nng ca con lc lũ xo t l vi cng k ca lũ xo. D. C nng ca con lc lũ xo bin thiờn theo quy lut hm s sin vi tn s bng tn s ca dao ng iu hũa. Cõu 8: Cho dao ng iu hũa cú phng trỡnh ta : x = 3cost (cm). Vect Fresnel biu din dao ng trờn cú gúc hp vi trc gc Ox thi im ban u l A. 0 rad B. 6 rad C. 2 rad D. 2 rad Cõu 9: Mt con lc lũ xo treo thng ng gm mt qu cu khi lng m gn vo lũ xo cú cng k. u cũn li ca lũ xo gn vo mt im c nh. Khi vt ng yờn, lũ xo dón 10cm. Ti v trớ cõn bng, ngi ta truyn cho qu cu mt vn tc u v 0 = 60cm/s hng xung. Ly g = 10m/s 2 . Biờn ca dao ng cú tr s bng A. 6 cm B. 0,3 m C. 0,6 m D. 0,5 cm Cõu 10: Mt con lc lũ xo treo thng ng gm mt qu cu khi lng m = 0,4 kg gn vo lũ xo cú cng k. u cũn li ca lũ xo gn vo mt im c nh. Khi vt ng yờn, lũ xo dón 10cm. Ti v trớ cõn bng, ngi ta truyn cho qu cu mt vn tc v 0 = 60 cm/s hng xung. Ly g = 10m/s 2 . Li qu cu khi ng nng bng th nng l A. 0,424 m B. 4,24 cm C. -0,42 m D. 0,42 m Cõu 11: Nng lng ca mt con lc n dao ng iu hũa A. tng 9 ln khi biờn tng 3 ln. B. gim 8 ln khi biờn gim 2 ln v tn s tng 2 ln. C. gim 16 ln khi tn s tng 3 ln v biờn gim 9 ln. D.gim ln khi tn s dao ng tng 5 ln v biờn dao ng gim 3 ln. Cõu 12: Mt vt cú khi lng m = 1 kg dao ng iu hũa vi chu kỡ T = 2 s. Vt qua v trớ cõn bng vi vn tc v 0 = 31,4 m/s. Khi t = 0, vt qua v trớ cú li x = 5 cm ngc chiu dng qu o. Ly 2 = 10. Pha ban u l A. A. 0 rad B. 6 rad C. 3 rad D. 3 rad Giaựo vieõn bieõn soaùn: Dửụng Baự Quyứnh Trang 2 Cõu 13: Mt vt thc hin ng thi hai dao ng iu hũa, cựng phng, cựng tn s cú phng trỡnh: x 1 = 3sin(4t + 2 ) (cm) ; x 2 = 3sin4t (cm). Dao ng tng hp ca vt cú biờn A. 6 cm B. 2 cm C. 3 cm D. 0 cm Cõu 14: Phỏt biu no sau õy l sai? A. Dao ng tt dn l dao ng cú biờn gim dn theo thi gian. B. Dao ng cng bc l dao ng chu tỏc dng ca mt ngoi lc bin thiờn tun hon. C. Khi cng hng dao ng xy ra, tn s dao ng cng bc ca h bng tn s riờng ca h dao ng ú. D. Tn s ca dao ng cng bc luụn bng tn s riờng ca h dao ng. Cõu 15: Lc tỏc dng gõy ra dao ng iu hũa ca mt vt luụn Mnh no sau õy khụng phự hp in vo ch trng trờn? A. bin thiờn iu hũa theo thi gian. B. hng v v trớ cõn bng. C. cú biu thc F = -kx D. cú ln khụng i theo thi gian. Cõu 16: Nng lng ca mt con lc lũ xo dao ng iu hũa A. tng 16 ln khi biờn tng 2 ln v chu kỡ gim 2 ln. B. gim 4 ln khi biờn gim 2 ln v khi lng tng 2 ln. C. gim 9 ln khi tn s tng 3 ln v biờn gim 2 ln. D. gim 25/4 ln khi tn s dao ng tng 5 ln v biờn dao ng gim 2 ln. Cõu 17: Mt con lc lũ xo gm vt nng khi lng m = 0,1 kg, lũ xo cú cng k = 40 N/m. Khi thay m bng m = 0,16 kg thỡ chu kỡ ca con lc tng A. 0,0038 s B. 0,083 s C. 0,0083 s D. 0,038 s Cõu 18: Mt con lc lũ xo treo thng ng cú vt nng khi lng m = 100g ang dao ng iu hũa. Vn tc ca vt khi qua v trớ cõn bng l 31,4 cm/s v gia tc cc i ca vt l 4 m/s 2 . Ly 2 = 10. cng ca lũ xo l A. 16 N/m B. 6,25 N/m C. 160 N/m D. 625 N/m Cõu 19: Mt vt thc hin ng thi hai dao ng iu hũa cựng phng, cựng tn s cú phng trỡnh: x 1 = 5sin(t - /2) (cm); x 2 = 5sint (cm). Dao ng tng hp ca vt cú phng trỡnh A. x = 5sin(t -/4 ) (cm) B. x = 5sin(t + /6) (cm) C.x = 5sin(t + /4) (cm) D. x = 5sin(t - /3) (cm) Cõu 20: Chn phỏt biu ỳng. A. Dao ng tt dn l dao ng cú tn s gim dn theo thi gian. B. Dao ng t do l dao ng cú biờn ch ph thuc vo c tớnh ca h, khụng ph thuc cỏc yu t bờn ngoi. C. Dao ng cng bc l dao ng duy trỡ nh ngoi lc khụng i. D. Dao ng tun hon l dao ng m trng thỏi dao ng c lp li nh c sau nhng khong thi gian bng nhau. Cõu 21: Chn phỏt biu sai. A. Dao ng iu hũa l dao ng c mụ t bng mt nh lut dng sin (hoc cosin) theo thi gian, x = Asin(t+), trong ú A, , l nhng hng s. B. Dao ng iu hũa cú th c coi nh hỡnh chiu ca mt chuyn ng trũn u xung mt ng thng nm trong mt phng qu o. C. Dao ng h cú th c biu din bng mt vect khụng i.D. Khi mt vt dh hũa thỡ vt ú cng dao ng tun hon. Cõu 22: Khi mt vt dao ng iu hũa, phỏt biu no sau õy cú ni dung sai? A. Khi vt i t v trớ biờn v VTCB thỡ ng nng tng dn. B. Khi vt i t VTCB n v trớ biờn thỡ th nng gim dn. C. Khi vt v trớ biờn thỡ ng nng trit tiờu. D. Khi vt qua v trớ cõn bng thỡ ng nng bng c nng. Cõu 23: S dao ng c duy trỡ di tỏc dng ca mt ngoi lc tun hon c gi l A. dao ng t do. B. dao ng cng bc. C. dao ng riờng. D.dao ng tun hon. Cõu 24: Hai dao ng iu hũa thnh phn cựng phng, cựng tn s, cựng pha cú biờn l A 1 v A 2 vi A 2 =3A 1 thỡ dao ng tng hp cú biờn A l A. A 1 . B. 2A 1 . C. 3A 1 . D. 4A 1 . Cõu 25: Bc súng c nh ngha A. l khong cỏch gia hai im gn nhau nht trờn cựng phng truyn súng m dao ng cựng pha. B. l quóng ng súng truyn i c trong mt chu kỡ. C. l khong cỏch gia hai nỳt súng gn nhau nht trong hin tng súng dng. D. nh cõu A hoc cõu B. . 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C. Dao ng cng bc l dao ng duy trỡ nh ngoi lc khụng i. D. Dao ng tun hon l dao ng m trng thỏi dao ng c lp li nh c sau nhng khong thi gian bng nhau. Cõu 21: Chn phỏt biu sai. A. Dao ng iu. nng bng c nng. Cõu 23: S dao ng c duy trỡ di tỏc dng ca mt ngoi lc tun hon c gi l A. dao ng t do. B. dao ng cng bc. C. dao ng riờng. D .dao ng tun hon. Cõu 24: Hai dao ng iu hũa thnh phn cựng