{"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":"C\u1eb7p l\u1ef1c n\u00e0o sau \u0111\u00e2y t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt l\u00e0m v\u1eadt \u0111ang \u0111\u1ee9ng y\u00ean ti\u1ebfp t\u1ee5c \u0111\u1ee9ng y\u00ean?","select":["A. Hai l\u1ef1c c\u00f9ng c\u01b0\u1eddng \u0111\u1ed9, c\u00f9ng ph\u01b0\u01a1ng.","B. Hai l\u1ef1c c\u00f9ng ph\u01b0\u01a1ng, ng\u01b0\u1ee3c chi\u1ec1u.","C. Hai l\u1ef1c c\u00f9ng ph\u01b0\u01a1ng, c\u00f9ng c\u01b0\u1eddng \u0111\u1ed9, c\u00f9ng chi\u1ec1u.","D. Hai l\u1ef1c c\u00f9ng c\u01b0\u1eddng \u0111\u1ed9, c\u00f9ng ph\u01b0\u01a1ng n\u1eb1m tr\u00ean c\u00f9ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng, ng\u01b0\u1ee3c chi\u1ec1u."],"hint":"","explain":"<span class='basic_left'>Hai l\u1ef1c c\u00f9ng c\u01b0\u1eddng \u0111\u1ed9, c\u00f9ng ph\u01b0\u01a1ng n\u1eb1m tr\u00ean c\u00f9ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng, ng\u01b0\u1ee3c chi\u1ec1u.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2560},{"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 ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a hai l\u1ef1c c\u00e2n b\u1eb1ng, th\u00ec: ","select":["A. V\u1eadt \u0111ang \u0111\u1ee9ng y\u00ean s\u1ebd chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n.","B. V\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng s\u1ebd d\u1eebng l\u1ea1i.","C. V\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u s\u1ebd kh\u00f4ng c\u00f2n chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u n\u1eefa.","D. V\u1eadt \u0111ang \u0111\u1ee9ng y\u00ean s\u1ebd \u0111\u1ee9ng y\u00ean, v\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng s\u1ebd chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u m\u00e3i."],"hint":"","explain":"<span class='basic_left'>V\u1eadt \u0111ang \u0111\u1ee9ng y\u00ean s\u1ebd \u0111\u1ee9ng y\u00ean, v\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng s\u1ebd chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u m\u00e3i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2561},{"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":"H\u00e0nh kh\u00e1ch ng\u1ed3i tr\u00ean xe \u00f4t\u00f4 \u0111ang chuy\u1ec3n \u0111\u1ed9ng b\u1ed7ng th\u1ea5y m\u00ecnh b\u1ecb nghi\u00eang ng\u01b0\u1eddi sang tr\u00e1i, \u0111i\u1ec1u n\u00e0y ch\u1ee9ng t\u1ecf xe nh\u01b0 th\u1ebf n\u00e0o? ","select":["A. \u0110\u1ed9t ng\u1ed9t gi\u1ea3m v\u1eadn t\u1ed1c.","B. \u0110\u1ed9t ng\u1ed9t t\u0103ng v\u1eadn t\u1ed1c.","C. \u0110\u1ed9t ng\u1ed9t r\u1ebd sang ph\u1ea3i.","D. \u0110\u1ed9t ng\u1ed9t r\u1ebd sang tr\u00e1i."],"hint":"","explain":"<span class='basic_left'>V\u00ec \u0111\u00e2y l\u00e0 l\u1ef1c qu\u00e1n t\u00ednh . Do ng\u01b0\u1eddi ng\u1ed3i trong xe \u0111ang ch\u1ecbu m\u1ed9t l\u1ef1c t\u00e1c \u0111\u1ed9ng l\u00ean ch\u00ednh m\u00ecnh ,chi\u1ebfc xe \u0111ang c\u00f3 l\u1ef1c \u0111i th\u1eb3ng, xe \u0111\u1ed9t ng\u1ed9t r\u1ebd ph\u1ea3i, theo qu\u00e1n t\u00ednh ng\u01b0\u1eddi l\u00e1i xe s\u1ebd v\u1eabn ti\u1ebfp t\u1ee5c h\u01b0\u1edbng v\u1ec1 ph\u00eda tr\u01b0\u1edbc do \u0111\u00f3 ta s\u1ebd b\u1ecb ngi\u00eang v\u1ec1 b\u00ean tr\u00e1i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2562},{"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":"Khi xe t\u0103ng t\u1ed1c \u0111\u1ed9t ng\u1ed9t, h\u00e0nh kh\u00e1ch ng\u1ed3i tr\u00ean xe c\u00f3 xu h\u01b0\u1edbng b\u1ecb ng\u00e3 ra ph\u00eda sau. C\u00e1ch gi\u1ea3i th\u00edch n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang?","select":["A. Do qu\u00e1n t\u00ednh.","B. Do ng\u01b0\u1eddi c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn.","C. Do c\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean ng\u01b0\u1eddi c\u00e2n b\u1eb1ng nhau.","D. M\u1ed9t l\u00fd do kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>H\u00e0nh kh\u00e1ch s\u1ebd \u0111\u1ed9t ng\u1ed9t ng\u00e3 v\u1ec1 ph\u00eda sau. Khi ch\u1ea1y th\u1eb3ng m\u00e0 \u0111\u1ed9t ng\u1ed9t t\u0103ng t\u1ed1c, theo qu\u00e1n t\u00ednh h\u00e0nh kh\u00e1ch tr\u00ean xe c\u00f3 chi\u1ec1u h\u01b0\u1edbng \u0111i v\u1ec1 ph\u00eda tr\u01b0\u1edbc ,v\u00ec kh\u00f4ng th\u1ec3 thay \u0111\u1ed5i v\u1eadn t\u1ed1c \u0111\u1ed9t ng\u1ed9t theo xe . <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2563},{"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":"Treo m\u1ed9t v\u1eadt v\u00e0o m\u1ed9t l\u1ef1c k\u1ebf th\u1ea5y l\u1ef1c k\u1ebf ch\u1ec9 $30N$. Kh\u1ed1i l\u01b0\u1ee3ng v\u1eadt l\u00e0 bao nhi\u00eau? Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang trong c\u00e1c k\u1ebft qu\u1ea3 sau:","select":["A. $m>3kg$.","B. $m = 30kg$.","C. $m = 3kg$.","D. $m < 3kg$."],"hint":"C\u00f4ng th\u1ee9c t\u00ednh tr\u1ecdng l\u1ef1c c\u1ee7a v\u1eadt l\u00e0 $P=mg=10m$","explain":"<span class='basic_left'>V\u00ec l\u1ef1c k\u00e9o c\u1ee7a l\u1ef1c k\u1ebf s\u1ebd c\u00e2n b\u1eb1ng v\u1edbi tr\u1ecdng l\u1ef1c, t\u1ee9c l\u00e0:<br\/> $F = P \u21d4 P=30 = mg$ . <br\/>Suy ra: $ m =\\dfrac{P}{g}=\\dfrac{30}{10}=3kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2564},{"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/bai5/lv2/img\/h6.jpg'\/><\/center>C\u1eb7p l\u1ef1c n\u00e0o trong h\u00ecnh l\u00e0 c\u1eb7p l\u1ef1c c\u00e2n b\u1eb1ng ?","select":["A. Trong h\u00ecnh a.","B. Trong h\u00ecnh a v\u00e0 b.","C. Trong h\u00ecnh c v\u00e0 d.","D. Trong h\u00ecnh d."],"hint":"","explain":"<span class='basic_left'>Hai l\u1ef1c c\u00e2n b\u1eb1ng khi ng\u01b0\u1ee3c chi\u1ec1u, c\u00f9ng \u0111\u1ed9 l\u1edbn, c\u00f9ng ph\u01b0\u01a1ng v\u00e0 c\u00f9ng \u0111\u1eb7t v\u00e0 m\u1ed9t v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2565},{"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":"Khi xe \u0111\u1ea1p, xe m\u00e1y \u0111ang xu\u1ed1ng d\u1ed1c, mu\u1ed1n d\u1eebng l\u1ea1i m\u1ed9t c\u00e1ch an to\u00e0n n\u00ean h\u00e3m phanh (th\u1eafng) b\u00e1nh n\u00e0o ? ","select":["A. B\u00e1nh tr\u01b0\u1edbc.","B. B\u00e1nh sau.","C. \u0110\u1ed3ng th\u1eddi c\u1ea3 hai b\u00e1nh.","D. B\u00e1nh tr\u01b0\u1edbc ho\u1eb7c b\u00e1nh sau \u0111\u1ec1u \u0111\u01b0\u1ee3c."],"hint":"","explain":"<span class='basic_left'>V\u00ec khi \u0111\u00f3 qu\u00e1n t\u00ednh c\u1ee7a xe l\u1edbn, n\u1ebfu phanh b\u00e1nh tr\u01b0\u1edbc s\u1ebd l\u00e0m cho xe tr\u01b0\u1ee3t ho\u1eb7c b\u1ecb l\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2566},{"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 \u00f4t\u00f4 kh\u1ed1i l\u01b0\u1ee3ng $2$ t\u1ea5n chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u tr\u00ean \u0111\u01b0\u1eddng n\u1eb1m ngang. Bi\u1ebft l\u1ef1c c\u1ea3n l\u00ean \u00f4t\u00f4 b\u1eb1ng $0,25$ l\u1ea7n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a xe. K\u1ec3 c\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean \u00f4t\u00f4.","select":["A. Tr\u1ecdng l\u1ef1c, l\u1ef1c ph\u00e1t \u0111\u1ed9ng, l\u1ef1c k\u00e9o v\u00e0 l\u1ef1c \u0111\u1ee1 c\u1ee7a m\u1eb7t \u0111\u01b0\u1eddng. ","B. Tr\u1ecdng l\u1ef1c, l\u1ef1c ph\u00e1t \u0111\u1ed9ng, l\u1ef1c c\u1ea3n v\u00e0 l\u1ef1c \u0111\u1ee1 c\u1ee7a m\u1eb7t \u0111\u01b0\u1eddng.","C. Tr\u1ecdng l\u1ef1c, l\u1ef1c ph\u00e1t \u0111\u1ed9ng, l\u1ef1c k\u00e9o. ","D. Tr\u1ecdng l\u1ef1c, l\u1ef1c ph\u00e1t \u0111\u1ed9ng, l\u1ef1c h\u00fat."],"hint":"","explain":"<span class='basic_left'>C\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean \u00f4t\u00f4: tr\u1ecdng l\u1ef1c, l\u1ef1c ph\u00e1t \u0111\u1ed9ng, l\u1ef1c c\u1ea3n v\u00e0 l\u1ef1c \u0111\u1ee1 c\u1ee7a m\u1eb7t \u0111\u01b0\u1eddng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2567},{"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 c\u1ee5c n\u01b0\u1edbc \u0111\u00e1 n\u1eb1m y\u00ean tr\u00ean m\u1eb7t b\u00e0n trong toa t\u00e0u \u0111ang chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u. H\u00e0nh kh\u00e1ch ng\u1ed3i c\u1ea1nh b\u00e0n b\u1ed7ng th\u1ea5y c\u1ee5c \u0111\u00e1 tr\u01b0\u1ee3t \u0111i. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o, c\u1ee5c \u0111\u00e1 s\u1ebd tr\u01b0\u1ee3t v\u1ec1 b\u00ean tr\u00e1i ?","select":["A. Khi v\u1eadn t\u1ed1c c\u1ee7a t\u00e0u t\u0103ng.","B. Khi t\u00e0u \u0111\u1ebfn \u0111o\u1ea1n \u0111\u01b0\u1eddng r\u1ebd v\u1ec1 b\u00ean ph\u1ea3i.","C. Khi v\u1eadn t\u1ed1c c\u1ee7a t\u00e0u gi\u1ea3m.","D. Khi t\u00e0u chuy\u1ebfn \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u."],"hint":"","explain":"<span class='basic_left'>Do l\u1ef1c qu\u00e1n t\u00ednh ng\u01b0\u1ee3c h\u01b0\u1edbng v\u1edbi gia t\u1ed1c c\u1ee7a con t\u00e0u.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2568},{"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, chuy\u1ec3n \u0111\u1ed9ng m\u00e0 kh\u00f4ng c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng.","select":["A. Xe m\u00e1y \u0111ang \u0111i tr\u00ean \u0111\u01b0\u1eddng.","B. Xe \u0111\u1ea1p chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng do qu\u00e1n t\u00ednh.","C. Chi\u1ebfc thuy\u1ec1n ch\u1ea1y tr\u00ean s\u00f4ng.","D. Chi\u1ebfc \u0111u quay \u0111ang quay."],"hint":"","explain":"<span class='basic_left'>Khi \u0111\u00f3 qu\u00e1n t\u00ednh gi\u00fap duy tr\u00ec chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xe \u0111\u1ea1p.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2569},{"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":"M\u1ed9t v\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u v\u1edbi v\u1eadn t\u1ed1c $V$ d\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a hai l\u1ef1c c\u00e2n b\u1eb1ng $F_1$ v\u00e0 $F_2$ ($V$ c\u00f9ng chi\u1ec1u v\u1edbi $F_2$). N\u1ebfu t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a l\u1ef1c $F_1$ th\u00ec v\u1eadt s\u1ebd chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c: ","select":["A. Lu\u00f4n t\u0103ng d\u1ea7n.","B. Lu\u00f4n gi\u1ea3m d\u1ea7n.","C. T\u0103ng d\u1ea7n \u0111\u1ebfn gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i, r\u1ed3i gi\u1ea3m d\u1ea7n.","D. Gi\u1ea3m d\u1ea7n \u0111\u1ebfn gi\u00e1 tr\u1ecb b\u1eb1ng kh\u00f4ng r\u1ed3i \u0111\u1ed5i chi\u1ec1u v\u00e0 t\u0103ng d\u1ea7n."],"hint":"","explain":"<span class='basic_left'>V\u00ec $F_1$ ng\u01b0\u1ee3c chi\u1ec1u $V$, n\u00ean khi t\u0103ng $F_1$ th\u00ec $V$ s\u1ebd gi\u1ea3m d\u1ea7n \u0111\u1ebfn khi b\u1eb1ng kh\u00f4ng, sau \u0111\u00f3 $V$ \u0111\u1ed5i chi\u1ec1u. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2570},{"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":"N\u1ebfu v\u1eadt ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a c\u00e1c l\u1ef1c kh\u00f4ng c\u00e2n b\u1eb1ng, th\u00ec c\u00e1c l\u1ef1c n\u00e0y kh\u00f4ng th\u1ec3 l\u00e0m v\u1eadt: ","select":["A. \u0110ang chuy\u1ec3n \u0111\u1ed9ng s\u1ebd chuy\u1ec3n \u0111\u1ed9ng nhanh l\u00ean.","B. \u0110ang chuy\u1ec3n \u0111\u1ed9ng s\u1ebd chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm l\u1ea1i.","C. \u0110ang chuy\u1ec3n \u0111\u1ed9ng s\u1ebd ti\u1ebfp t\u1ee5c chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u.","D. B\u1ecb bi\u1ebfn d\u1ea1ng."],"hint":"","explain":"<span class='basic_left'>C\u00e1c l\u1ef1c kh\u00f4ng c\u00e2n b\u1eb1ng s\u1ebd kh\u00f4ng th\u1ec3 l\u00e0m cho v\u1eadt chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2571},{"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 xe \u00f4 t\u00f4 \u0111ang chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng th\u00ec \u0111\u1ed9t ng\u1ed9t phanh l\u1ea1i, h\u00e0nh kh\u00e1ch tr\u00ean xe b\u1ecb x\u00f4 v\u1ec1 ph\u00eda tr\u01b0\u1edbc l\u00e0 do:","select":["A. L\u1ef1c ma s\u00e1t.","B. Tr\u1ecdng l\u1ef1c.","C. L\u1ef1c qu\u00e1n t\u00ednh.","D. L\u1ef1c \u0111\u00e0n h\u1ed3i."],"hint":"","explain":"<span class='basic_left'>Khi xe \u00f4 t\u00f4 \u0111ang chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng th\u00ec \u0111\u1ed9t ng\u1ed9t phanh l\u1ea1i, h\u00e0nh kh\u00e1ch tr\u00ean xe b\u1ecb x\u00f4 v\u1ec1 ph\u00eda tr\u01b0\u1edbc l\u00e0 do l\u1ef1c qu\u00e1n t\u00ednh.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2572},{"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":"Hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 hai l\u1ef1c:","select":["A. C\u00f9ng \u0111i\u1ec3m \u0111\u1eb7t, c\u00f9ng ph\u01b0\u01a1ng, c\u00f9ng chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 b\u1eb1ng nhau.","B. C\u00f9ng \u0111i\u1ec3m \u0111\u1eb7t, c\u00f9ng ph\u01b0\u01a1ng, ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 b\u1eb1ng nhau.","C. \u0110\u1eb7t tr\u00ean hai v\u1eadt kh\u00e1c nhau, c\u00f9ng ph\u01b0\u01a1ng, c\u00f9ng chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 b\u1eb1ng nhau.","D. \u0110\u1eb7t tr\u00ean hai v\u1eadt kh\u00e1c nhau, c\u00f9ng ph\u01b0\u01a1ng, ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 b\u1eb1ng nhau."],"hint":"","explain":"<span class='basic_left'>Hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 hai l\u1ef1c c\u00f9ng \u0111i\u1ec3m \u0111\u1eb7t, c\u00f9ng ph\u01b0\u01a1ng, ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 b\u1eb1ng nhau.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2573},{"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":"M\u1ed9t v\u1eadt \u0111ang \u0111\u1ee9ng y\u00ean tr\u00ean m\u1eb7t ph\u1eb3ng n\u1eb1m ngang. C\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt c\u00e2n b\u1eb1ng nhau l\u00e0:","select":["A. Tr\u1ecdng l\u1ef1c $P$ c\u1ee7a Tr\u00e1i \u0110\u1ea5t v\u1edbi l\u1ef1c ma s\u00e1t $F$ c\u1ee7a m\u1eb7t b\u00e0n.","B. Tr\u1ecdng l\u1ef1c $P$ c\u1ee7a Tr\u00e1i \u0110\u1ea5t v\u1edbi l\u1ef1c \u0111\u00e0n h\u1ed3i.","C. Tr\u1ecdng l\u1ef1c $P$ c\u1ee7a Tr\u00e1i \u0110\u1ea5t v\u1edbi ph\u1ea3n l\u1ef1c N c\u1ee7a m\u1eb7t b\u00e0n.","D. L\u1ef1c ma s\u00e1t $F$ v\u1edbi ph\u1ea3n l\u1ef1c $N$ c\u1ee7a m\u1eb7t b\u00e0n."],"hint":"","explain":"<span class='basic_left'>C\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt c\u00e2n b\u1eb1ng nhau l\u00e0 tr\u1ecdng l\u1ef1c $P$ c\u1ee7a Tr\u00e1i \u0110\u1ea5t v\u1edbi ph\u1ea3n l\u1ef1c $N$ c\u1ee7a m\u1eb7t b\u00e0n, n\u00ean v\u1eadt s\u1ebd n\u1eb1m y\u00ean tr\u00ean b\u00e0n. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2574},{"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, m\u1ecdi v\u1eadt \u0111\u1ec1u kh\u00f4ng th\u1ec3 thay \u0111\u1ed5i v\u1eadn t\u1ed1c \u0111\u1ed9t ng\u1ed9t \u0111\u01b0\u1ee3c v\u00ec m\u1ecdi v\u1eadt \u0111\u1ec1u c\u00f3:","select":["A. Ma s\u00e1t.","B. Tr\u1ecdng l\u1ef1c.","C. Qu\u00e1n t\u00ednh.","D. \u0110\u00e0n h\u1ed3i."],"hint":"","explain":"<span class='basic_left'>Khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng, m\u1ecdi v\u1eadt \u0111\u1ec1u kh\u00f4ng th\u1ec3 thay \u0111\u1ed5i v\u1eadn t\u1ed1c \u0111\u1ed9t ng\u1ed9t \u0111\u01b0\u1ee3c v\u00ec m\u1ecdi v\u1eadt \u0111\u1ec1u c\u00f3 qu\u00e1n t\u00ednh.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2575},{"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/bai5/lv2/img\/h17.jpg'\/><\/center>Quan s\u00e1t h\u00ecnh v\u1ebd b\u00ean, c\u1eb7p l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0:","select":["A. $F_1$ v\u00e0 $F_3$.","B. $F_1$ v\u00e0 $F_4$.","C. $F_4$ v\u00e0 $F_3$.","D. $F_1$ v\u00e0 $F_2$."],"hint":"","explain":"<span class='basic_left'>Hai l\u1ef1c $F_1$ v\u00e0 $F_4$ c\u00e2n b\u1eb1ng v\u00ec l\u00e0 hai l\u1ef1c c\u00f9ng \u0111i\u1ec3m \u0111\u1eb7t, c\u00f9ng ph\u01b0\u01a1ng, ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 b\u1eb1ng nhau.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2576},{"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":"M\u1ed9t qu\u1ea3 b\u00f3ng kh\u1ed1i l\u01b0\u1ee3ng $0,5 kg$ \u0111\u01b0\u1ee3c treo v\u00e0o \u0111\u1ea7u m\u1ed9t s\u1ee3i d\u00e2y, ph\u1ea3i gi\u1eef \u0111\u1ea7u d\u00e2y v\u1edbi m\u1ed9t l\u1ef1c b\u1eb1ng bao nhi\u00eau \u0111\u1ec3 qu\u1ea3 b\u00f3ng n\u1eb1m c\u00e2n b\u1eb1ng.","select":["A. $0,5 N$.","B. Nh\u1ecf h\u01a1n $0,5 N$.","C. $5N$.","D. Nh\u1ecf h\u01a1n $5N$."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t qu\u1ea3 b\u00f3ng kh\u1ed1i l\u01b0\u1ee3ng $0,5$ kg th\u00ec c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng $5N$, v\u1eady c\u1ea7n gi\u1eef \u0111\u1ea7u d\u00e2y v\u1edbi m\u1ed9t l\u1ef1c $5N$ \u0111\u1ec3 qu\u1ea3 b\u00f3ng n\u1eb1m c\u00e2n b\u1eb1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2577},{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai5/lv2/img\/h19.jpg'\/><\/center>M\u1ed9t v\u1eadt n\u1eb1m y\u00ean tr\u00ean m\u1eb7t b\u00e0n n\u1eb1m nghi\u00eang (h\u00ecnh v\u1ebd), l\u1ef1c c\u00e2n b\u1eb1ng v\u1edbi tr\u1ecdng l\u1ef1c P l\u00e0:","select":["A. $F_1$ .","B. $N$.","C. H\u1ee3p l\u1ef1c c\u1ee7a $F_1$ v\u00e0 $N$.","D. T\u1ea5t c\u1ea3 \u0111\u1ec1u sai."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ec3 v\u1eadt c\u00e2n b\u1eb1ng th\u00ec h\u1ee3p l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt b\u1eb1ng kh\u00f4ng. <br\/>N\u00ean h\u1ee3p l\u1ef1c c\u1ee7a $F_1$ v\u00e0 $N$ ph\u1ea3i c\u00e2n b\u1eb1ng v\u1edbi $P$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2578},{"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":"Treo m\u1ed9t v\u1eadt v\u00e0o m\u1ed9t l\u1ef1c k\u1ebf th\u1ea5y l\u1ef1c k\u1ebf ch\u1ec9 $50N$. Kh\u1ed1i l\u01b0\u1ee3ng v\u1eadt l\u00e0 bao nhi\u00eau? Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang trong c\u00e1c k\u1ebft qu\u1ea3 sau:","select":["A. $m > 5kg$.","B. $m = 50kg$.","C. $m = 5kg$.","D. $m < 5kg$."],"hint":"","explain":"<span class='basic_left'>L\u1ef1c k\u1ebf ch\u1ec9 $50N$ n\u00ean tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt l\u00e0 $50N$, v\u1eady kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt l\u00e0 $5kg$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2579}],"lesson":{"save":0,"level":2}}