Chuyển động biến đổi. Gia tốc

Home Lớp 10 Vật lý 10 - Sách kết nối tri thức Bài 8: Chuyển động biến đổi. Gia tốcBài tập trung bình

{"common":{"save":0,"post_id":"6341","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5856","mon_id":"1158790","chapter_id":"1158795","post_id":"6341","question":"Khi $a. \\nu < 0$<\/span> thì…<\/p>","options":["A. v\u1eadt \u0111\u1ee9ng yên","B. v\u1eadt chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u","C. v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n","D. v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n"],"correct":"4","level":"2","hint":"Khi $a. \\nu < 0$<\/span> ( $\\overrightarrow{a}$<\/span> ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi $\\overrightarrow{v}$<\/span> ) thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n.<\/p>","answer":"Ch\u1ecdn D.<\/strong><\/span> Khi $a. \\nu < 0$<\/span> ( $\\overrightarrow{a}$<\/span> ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi $\\overrightarrow{\\nu}$<\/span> ) thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n.<\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-10-25 08:43:44","option_type":"txt","len":2},{"id":"5857","mon_id":"1158790","chapter_id":"1158795","post_id":"6341","question":"“N\u1ebfu gia t\u1ed1c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng có giá tr\u1ecb d\u01b0\u01a1ng thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n, n\u1ebfu gia t\u1ed1c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng có giá tr\u1ecb âm thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n”. Nh\u1eadn \u0111\u1ecbnh này \u0111úng hay sai?<\/p>","options":["A. \u0110úng","B. Sai"],"correct":"2","level":"2","hint":"","answer":"Ch\u1ecdn B.<\/strong><\/span>N\u1ebfu  $a$<\/span> và $\\nu$<\/span> cùng d\u1ea5u ( $\\overrightarrow{a}$<\/span> cùng chi\u1ec1u v\u1edbi $\\overrightarrow{\\nu}$<\/span> ) thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n. N\u1ebfu $a$<\/span>  và $\\nu$<\/span> trái d\u1ea5u ( $\\overrightarrow{a}$<\/span> cùng chi\u1ec1u v\u1edbi $\\overrightarrow{\\nu}$<\/span> ) thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n.<\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-10-25 08:46:16","option_type":"txt","len":1},{"id":"5858","mon_id":"1158790","chapter_id":"1158795","post_id":"6341","question":"T\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m, m\u1ed9t v\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c 60 km\/h, có gia t\u1ed1c a = 5 $m\/s^2$<\/span>. Hãy cho bi\u1ebft \u0111ây là lo\u1ea1i chuy\u1ec3n \u0111\u1ed9ng gì?<\/p>","options":["A. chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u ","B. chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n","C. chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n","D. ch\u01b0a \u0111\u1ee7 d\u1eef ki\u1ec7n \u0111\u1ec3 k\u1ebft lu\u1eadn"],"correct":"2","level":"2","hint":"Xét:  a.v > 0 => chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n a.v < 0 => chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n<\/p>","answer":"Ch\u1ecdn B.<\/strong><\/span> V\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c 60 km\/h, có gia t\u1ed1c a = 5 $m\/s^2$<\/span><\/p>Ta có: a.v > 0 => \u0111ây là chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n.<\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-10-25 08:48:03","option_type":"txt","len":2}]}