{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Khi ch\u1ec9 c\u00f3 m\u1ed9t l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt th\u00ec v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt \u0111\u00f3 s\u1ebd nh\u01b0 th\u1ebf n\u00e0o? H\u00e3y ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang. ","select":["A. V\u1eadn t\u1ed1c kh\u00f4ng thay \u0111\u1ed5i.","B. V\u1eadn t\u1ed1c t\u0103ng d\u1ea7n.","C. V\u1eadn t\u1ed1c gi\u1ea3m d\u1ea7n.","D. C\u00f3 th\u1ec3 t\u0103ng d\u1ea7n v\u00e0 c\u0169ng c\u00f3 th\u00ea gi\u1ea3m d\u1ea7n."],"hint":"","explain":"<span class='basic_left'>C\u00f3 th\u1ec3 t\u0103ng d\u1ea7n v\u00e0 c\u0169ng c\u00f3 th\u1ec3 gi\u1ea3m d\u1ea7n, v\u00ec l\u1ef1c c\u00f3 th\u1ec3 l\u00e0m thay \u0111\u1ed5i v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2540},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai4/lv2/img\/h0.jpg'\/><\/center>Tr\u00ean h\u00ecnh v\u1ebd a v\u00e0 b: ${{F}_{1}}$ v\u00e0 ${{F}_{2}}$ l\u00e0 c\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean c\u00e1c v\u1eadt (1) v\u00e0 (2), ${{v}_{1}}$ v\u00e0 ${{v}_{2}}$ l\u00e0 v\u1eadn t\u1ed1c ban \u0111\u1ea7u c\u1ee7a c\u00e1c v\u1eadt. Trong c\u00e1c k\u1ebft lu\u1eadn sau \u0111\u00e2y, k\u1ebft qu\u1ea3 n\u00e0o l\u00e0 \u0111\u00fang? ","select":["A. V\u1eadn t\u1ed1c v\u1eadt (1) t\u0103ng, v\u1eadn t\u1ed1c v\u1eadt (2) t\u0103ng.","B. V\u1eadn t\u1ed1c v\u1eadt (1) t\u0103ng, v\u1eadn t\u1ed1c v\u1eadt (2) gi\u1ea3m.","C. V\u1eadn t\u1ed1c v\u1eadt (1) gi\u1ea3m, v\u1eadn t\u1ed1c v\u1eadt (2) t\u0103ng.","D. V\u1eadn t\u1ed1c v\u1eadt (1) gi\u1ea3m, v\u1eadn t\u1ed1c v\u1eadt (2) gi\u1ea3m."],"hint":"","explain":"<span class='basic_left'>V\u00ec khi l\u1ef1c ${{F}_{1}}$ c\u00f9ng ph\u01b0\u01a1ng c\u00f9ng chi\u1ec1u ${{v}_{1}}$ l\u00e0m t\u0103ng chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1eadt, v\u1eadn t\u1ed1c t\u0103ng, v\u00e0 ${{F}_{2}}$ c\u00f9ng ph\u01b0\u01a1ng ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi ${{v}_{2}}$ n\u00ean l\u00e0m c\u1ea3n tr\u1edf chuy\u1ec3n \u0111\u1ed9ng, v\u1eadn t\u1ed1c gi\u1ea3m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2541},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"S\u1eed d\u1ee5ng c\u1ee5m t\u1eeb th\u00edch h\u1ee3p \u0111\u1ec3 \u0111i\u1ec1n v\u00e0o ch\u1ed7 tr\u1ed1ng cho \u0111\u00fang \u00fd ngh\u0129a v\u1eadt l\u00ed:<br\/>....... l\u00e0 nguy\u00ean nh\u00e2n l\u00e0m thay \u0111\u1ed5i v\u1eadn t\u1ed1c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng.","select":["A. Vecto.","B. Thay \u0111\u1ed5i.","C. V\u1eadn t\u1ed1c.","D. L\u1ef1c."],"hint":"","explain":"<span class='basic_left'>L\u1ef1c l\u00e0 nguy\u00ean nh\u00e2n l\u00e0m thay \u0111\u1ed5i v\u1eadn t\u1ed1c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2542},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"D\u00f9ng c\u1ee5m t\u1eeb th\u00edch h\u1ee3p nh\u1ea5t \u0111\u1ec3 \u0111i\u1ec1n v\u00e0o ch\u1ed7 tr\u1ed1ng: <br\/>L\u1ef1c l\u00e0 nguy\u00ean nh\u00e2n l\u00e0m ......... v\u1eadn t\u1ed1c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng.","select":["A. T\u0103ng.","B. Kh\u00f4ng \u0111\u1ed5i.","C. Gi\u1ea3m.","D. Thay \u0111\u1ed5i."],"hint":"","explain":"<span class='basic_left'>L\u1ef1c l\u00e0 nguy\u00ean nh\u00e2n l\u00e0m thay \u0111\u1ed5i v\u1eadn t\u1ed1c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2543},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai4/lv2/img\/h1.jpg'\/><\/center>Tr\u00ean h\u00ecnh v\u1ebd l\u00e0 l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean ba v\u1eadt theo c\u00f9ng m\u1ed9t t\u1ec9 l\u1ec7 x\u00edch nh\u01b0 nhau. Trong c\u00e1c s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 gi\u1ea3m d\u1ea7n c\u1ee7a l\u1ef1c sau \u0111\u00e2y, s\u1eafp x\u1ebfp n\u00e0o l\u00e0 \u0111\u00fang?","select":["A. ${{F}_{3}}$ >${{F}_{2}}$ >${{F}_{1}}$ .","B. ${{F}_{2}}$ >${{F}_{3}}$ >${{F}_{1}}$ .","C. ${{F}_{1}}$ >${{F}_{2}}$ >${{F}_{3}}$ .","D. M\u1ed9t c\u00e1ch s\u1eafp x\u1ebfp kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>${{F}_{3}}$ >${{F}_{2}}$ >${{F}_{1}}$ v\u00ec ${{F}_{3}}$ =2${{F}_{2}}$ =3${{F}_{1}}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2544},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/> Khi qu\u1ea3 b\u00f3ng l\u0103n v\u00e0o b\u00e3i c\u00e1t, do \u2026\u2026\u2026(1)\u2026\u2026\u2026 c\u1ee7a c\u00e1t n\u00ean v\u1eadn t\u1ed1c c\u1ee7a b\u00f3ng b\u1ecb \u2026\u2026\u2026(2)\u2026\u2026\u2026","select":["A. (1) l\u1ef1c h\u00fat, (2) gi\u1ea3m.","B. (1) l\u1ef1c c\u1ea3n, (2) gi\u1ea3m.","C. (1) l\u1ef1c c\u1ea3n, (2) t\u0103ng.","D. (1) l\u1ef1c h\u00fat, (2) t\u0103ng."],"hint":"","explain":"<span class='basic_left'>Khi qu\u1ea3 b\u00f3ng l\u0103n v\u00e0o b\u00e3i c\u00e1t, do l\u1ef1c c\u1ea3n c\u1ee7a c\u00e1t n\u00ean v\u1eadn t\u1ed1c c\u1ee7a b\u00f3ng b\u1ecb gi\u1ea3m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2545},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai4/lv2/img\/h2.jpg'\/><\/center>M\u1ed9t \u00f4 t\u00f4 \u0111ang chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u v\u1edbi v\u1eadn t\u1ed1c $V$. N\u1ebfu t\u00e1c d\u1ee5ng l\u00ean \u00f4t\u00f4 l\u1ef1c $F$ theo hai t\u00ecnh hu\u1ed1ng minh h\u1ecda trong h\u00ecnh a v\u00e0 b (H.4.3) th\u00ec v\u1eadn t\u1ed1c c\u1ee7a \u00f4t\u00f4 thay \u0111\u1ed5i nh\u01b0 th\u1ebf n\u00e0o ? ","select":["A. Trong t\u00ecnh hu\u1ed1ng a v\u1eadn t\u1ed1c t\u0103ng, trong t\u00ecnh hu\u00f4ng b v\u1eadn t\u1ed1c gi\u1ea3m.","B. Trong t\u00ecnh hu\u1ed1ng a v\u1eadn t\u1ed1c gi\u1ea3m, trong t\u00ecnh hu\u1ed1ng b v\u1eadn t\u1ed1c gi\u1ea3m.","C. Trong t\u00ecnh hu\u1ed1ng a v\u1eadn t\u1ed1c t\u0103ng, trong t\u00ecnh hu\u1ed1ng b v\u1eadn t\u1ed1c t\u0103ng.","D. Trong t\u00ecnh hu\u1ed1ng a v\u1eadn t\u1ed1c gi\u1ea3m, trong t\u00ecnh hu\u1ed1ng b v\u1eadn t\u1ed1c t\u0103ng."],"hint":"","explain":"<span class='basic_left'>V\u00ec trong t\u00ecnh hu\u1ed1ng a, l\u1ef1c ng\u01b0\u1ee3c chi\u1ec1u v\u1eadn t\u1ed1c, trong t\u00ecnh hu\u1ed1ng b, l\u1ef1c c\u00f9ng chi\u1ec1u v\u1eadn t\u1ed1c.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2546},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai4/lv2/img\/h3.jpg'\/><\/center>H\u00ecnh n\u00e0o sau \u0111\u00e2y m\u00f4 t\u1ea3 hai l\u1ef1c c\u00e2n b\u1eb1ng?","select":["A. H\u00ecnh (a).","B. H\u00ecnh (b).","C. H\u00ecnh (c). ","D. H\u00ecnh (d)."],"hint":"","explain":"<span class='basic_left'>H\u00ecnh d m\u00f4 t\u1ea3 hai l\u1ef1c b\u1eb1ng nhau, ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 c\u00f9ng n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng th\u1eb3ng, \u0111\u00f3 l\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2547},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"K\u1ebft lu\u1eadn n\u00e0o sau \u0111\u00e2y <b> kh\u00f4ng \u0111\u00fang<\/b>?","select":["A. L\u1ef1c l\u00e0 nguy\u00ean nh\u00e2n duy tr\u00ec chuy\u1ec3n \u0111\u1ed9ng.","B. L\u1ef1c l\u00e0 nguy\u00ean nh\u00e2n khi\u1ebfn v\u1eadt thay \u0111\u1ed5i h\u01b0\u1edbng chuy\u1ec3n \u0111\u1ed9ng.","C. L\u1ef1c l\u00e0 nguy\u00ean nh\u00e2n khi\u1ebfn v\u1eadt thay \u0111\u1ed5i v\u1eadn t\u1ed1c.","D. M\u1ed9t v\u1eadt b\u1ecb bi\u1ebfn d\u1ea1ng l\u00e0 do c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o n\u00f3."],"hint":"","explain":"<span class='basic_left'>L\u1ef1c l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra chuy\u1ec3n \u0111\u1ed9ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2548},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Trong c\u00e1c chuy\u1ec3n \u0111\u1ed9ng d\u01b0\u1edbi \u0111\u00e2y chuy\u1ec3n \u0111\u1ed9ng n\u00e0o do t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c.","select":["A. Xe \u0111i tr\u00ean \u0111\u01b0\u1eddng.","B. Th\u00e1c n\u01b0\u1edbc \u0111\u1ed5 t\u1eeb tr\u00ean cao xu\u1ed1ng.","C. M\u0169i t\u00ean b\u1eafn ra t\u1eeb c\u00e1nh cung.","D. Qu\u1ea3 b\u00f3ng b\u1ecb n\u1ea3y b\u1eadt l\u00ean khi ch\u1ea1m \u0111\u1ea5t."],"hint":"","explain":"<span class='basic_left'>Th\u00e1c n\u01b0\u1edbc \u0111\u1ed5 t\u1eeb tr\u00ean cao xu\u1ed1ng do t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2549},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Mu\u1ed1n bi\u1ec3u di\u1ec5n m\u1ed9t v\u00e9c t\u01a1 l\u1ef1c ch\u00fang ta c\u1ea7n ph\u1ea3i bi\u1ebft c\u00e1c y\u1ebfu t\u1ed1? ","select":["A. Ph\u01b0\u01a1ng, chi\u1ec1u.","B. \u0110i\u1ec3m \u0111\u1eb7t, ph\u01b0\u01a1ng, chi\u1ec1u.","C. \u0110i\u1ec3m \u0111\u1eb7t, ph\u01b0\u01a1ng, \u0111\u1ed9 l\u1edbn.","D. \u0110i\u1ec3m \u0111\u1eb7t, ph\u01b0\u01a1ng, chi\u1ec1u v\u00e0 \u0111\u1ed9 l\u1edbn."],"hint":"","explain":"<span class='basic_left'>Mu\u1ed1n bi\u1ec3u di\u1ec5n m\u1ed9t v\u00e9c t\u01a1 l\u1ef1c ch\u00fang ta c\u1ea7n ph\u1ea3i bi\u1ebft c\u00e1c y\u1ebfu t\u1ed1 \u0111i\u1ec3m \u0111\u1eb7t, ph\u01b0\u01a1ng, chi\u1ec1u v\u00e0 \u0111\u1ed9 l\u1edbn.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2550},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"M\u1ed9t v\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng v\u1edbi v\u1eadn t\u1ed1c. Mu\u1ed1n v\u1eadt chuy\u1ec3n \u0111\u1ed9ng theo ph\u01b0\u01a1ng c\u0169 v\u00e0 chuy\u1ec3n \u0111\u1ed9ng nhanh l\u00ean th\u00ec ta ph\u1ea3i t\u00e1c d\u1ee5ng m\u1ed9t l\u1ef1c nh\u01b0 th\u1ebf n\u00e0o v\u00e0o v\u1eadt? H\u00e3y ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang.","select":["A. C\u00f9ng ph\u01b0\u01a1ng c\u00f9ng chi\u1ec1u v\u1edbi v\u1eadn t\u1ed1c.","B. C\u00f9ng ph\u01b0\u01a1ng ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi v\u1eadn t\u1ed1c.","C. C\u00f3 ph\u01b0\u01a1ng vu\u00f4ng g\u00f3c v\u1edbi v\u1edbi v\u1eadn t\u1ed1c.","D. C\u00f3 ph\u01b0\u01a1ng b\u1ea5t k\u1ef3 so v\u1edbi v\u1eadn t\u1ed1c."],"hint":"","explain":"<span class='basic_left'> Mu\u1ed1n v\u1eadt chuy\u1ec3n \u0111\u1ed9ng theo ph\u01b0\u01a1ng c\u0169 v\u00e0 chuy\u1ec3n \u0111\u1ed9ng nhanh l\u00ean th\u00ec ta ph\u1ea3i t\u00e1c d\u1ee5ng m\u1ed9t l\u1ef1c c\u00f9ng ph\u01b0\u01a1ng c\u00f9ng chi\u1ec1u v\u1edbi v\u1eadn t\u1ed1c. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2551},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1ed9t v\u1eadt n\u1ebfu c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng s\u1ebd:","select":["A. thay \u0111\u1ed5i kh\u1ed1i l\u01b0\u1ee3ng.","B. thay \u0111\u1ed5i v\u1eadn t\u1ed1c.","C. kh\u00f4ng thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i. ","D. kh\u00f4ng thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t v\u1eadt n\u1ebfu c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng s\u1ebd thay \u0111\u1ed5i v\u1eadn t\u1ed1c<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2552},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt th\u00ec..........<br\/>","select":["A. L\u1ef1c t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt l\u00e0m v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh l\u00ean.","B. L\u1ef1c t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt l\u00e0m v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm l\u1ea1i.","C. L\u1ef1c t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt l\u00e0m v\u1eadt bi\u1ebfn d\u1ea1ng v\u00e0 bi\u1ebfn \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1eadt.","D. L\u1ef1c t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt l\u00e0m bi\u1ebfn \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1eadt."],"hint":"","explain":"<span class='basic_left'>Khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt th\u00ec l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt l\u00e0m v\u1eadt bi\u1ebfn d\u1ea1ng v\u00e0 bi\u1ebfn \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2553},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai4/lv2/img\/h4.jpg'\/><\/center>S\u1eed d\u1ee5ng h\u00ecnh v\u1ebd b\u00ean (minh h\u1ecda cho tr\u01b0\u1eddng h\u1ee3p k\u00e9o g\u00e0u n\u01b0\u1edbc t\u1eeb d\u01b0\u1edbi gi\u1ebfng l\u00ean). H\u00e3y ch\u1ecdn ph\u00e1t bi\u1ec3u ch\u01b0a ch\u00ednh x\u00e1c.","select":["A. L\u1ef1c k\u00e9o c\u00f3 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u h\u01b0\u1edbng l\u00ean tr\u00ean, \u0111\u1ed9 l\u1edbn 40N.","B. Tr\u1ecdng l\u1ef1c c\u00f3 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u h\u01b0\u1edbng xu\u1ed1ng, \u0111\u1ed9 l\u1edbn 30N.","C. L\u1ef1c k\u00e9o v\u00e0 tr\u1ecdng l\u1ef1c kh\u00f4ng c\u00f9ng ph\u01b0\u01a1ng.","D. C\u1ea3 A v\u00e0 B \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'>T\u1eeb h\u00ecnh v\u1ebd ta th\u1ea5y tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a th\u00f9ng n\u01b0\u1edbc l\u00e0 30N v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a l\u1ef1c k\u00e9o l\u00e0 40N.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2554},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai4/lv2/img\/h6.jpg'\/><\/center>Khi n\u00e9m m\u1ed9t qu\u1ea3 b\u00f3ng l\u00ean cao (b\u1ecf qua m\u1ecdi ma s\u00e1t), h\u00ecnh v\u1ebd n\u00e0o sau \u0111\u00e2y di\u1ec5n t\u1ea3 \u0111\u00fang c\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean qu\u1ea3 b\u00f3ng.","select":["A. H\u00ecnh 1.","B. H\u00ecnh 2.","C. H\u00ecnh 3.","D. H\u00ecnh 4."],"hint":"","explain":"<span class='basic_left'>Khi n\u00e9m qu\u1ea3 b\u00f3ng l\u00ean cao th\u00ec l\u1ef1c n\u00e9m (\u0111\u1ea9y qu\u1ea3 b\u00f3ng l\u00ean) l\u1edbn h\u01a1n tr\u1ecdng l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean qu\u1ea3 b\u00f3ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2555},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai4/lv2/img\/h5.jpg'\/><\/center>C\u00f3 ba l\u1ef1c c\u00f9ng t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt nh\u01b0 h\u00ecnh v\u1ebd b\u00ean. L\u1ef1c t\u1ed5ng h\u1ee3p t\u00e1c d\u1ee5ng l\u00ean v\u1eadt l\u00e0: ","select":["A. 75N.","B. 125N.","C. 25N.","D. 50N."],"hint":"","explain":"<span class='basic_left'>S\u1eed d\u1ee5ng quy t\u1eafc t\u1ed5ng h\u1ee3p l\u1ef1c song song ta t\u00ednh \u0111\u01b0\u1ee3c h\u1ee3p l\u1ef1c l\u00e0 75N.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2556},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai4/lv2/img\/h7.jpg'\/><\/center>H\u00ecnh v\u1ebd n\u00e0o sau \u0111\u00e2y bi\u1ec3u di\u1ec5n \u0111\u00fang tr\u1ecdng l\u1ef1c c\u1ee7a v\u1eadt n\u1eb7ng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 1kg. ","select":["A. H\u00ecnh 1","B. H\u00ecnh 2","C. H\u00ecnh 3","D. H\u00ecnh 4"],"hint":"","explain":"<span class='basic_left'>1kg t\u01b0\u01a1ng \u1ee9ng v\u1edbi 10N, m\u1ed9t \u0111o\u1ea1n \u1ee9ng v\u1edbi 2N n\u00ean ta c\u1ea7n 5 \u0111o\u1ea1n v\u00e0 chi\u1ec1u h\u01b0\u1edbng xu\u1ed1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2557},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y, cho ta bi\u1ebft khi ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c v\u1eadt v\u1eeba b\u1ecb bi\u1ebfn d\u1ea1ng v\u1eeba b\u1ecb bi\u1ebfn \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng.","select":["A. Gi\u00f3 th\u1ed5i c\u00e0nh l\u00e1 \u0111ung \u0111\u01b0a.","B. Sau khi \u0111\u1eadp v\u00e0o m\u1eb7t v\u1ee3t qu\u1ea3 b\u00f3ng tenn\u00edt b\u1ecb b\u1eadt ng\u01b0\u1ee3c tr\u1edf l\u1ea1i.","C. M\u1ed9t v\u1eadt \u0111ang r\u01a1i t\u1eeb tr\u00ean cao xu\u1ed1ng.","D. Khi h\u00e3m phanh xe \u0111\u1ea1p ch\u1ea1y ch\u1eadm d\u1ea7n."],"hint":"","explain":"<span class='basic_left'>Qu\u1ea3 b\u00f3ng v\u1eeba b\u1ecb bi\u1ebfn d\u1ea1ng v\u1eeba b\u1ecb thay \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2558},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Tr\u1ecdng l\u1ef1c c\u1ee7a v\u1eadt c\u00f3:","select":["A. Ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u h\u01b0\u1edbng x\u1ed1ng.","B. Ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u h\u01b0\u1edbng l\u00ean.","C. Ph\u01b0\u01a1ng n\u1eb1m ngang, chi\u1ec1u chuy\u1ec3n \u0111\u1ed9ng.","D. Ph\u01b0\u01a1ng xi\u00ean g\u00f3c, chi\u1ec1u chuy\u1ec3n \u0111\u1ed9ng."],"hint":"","explain":"<span class='basic_left'>Tr\u1ecdng l\u1ef1c c\u1ee7a v\u1eadt c\u00f3 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u h\u01b0\u1edbng x\u1ed1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2559}],"lesson":{"save":0,"level":2}}