Lực ma sát

Home Lớp 10 Vật lý 10 - Sách kết nối tri thức Bài 18: Lực ma sátBài tập cơ bản

{"common":{"save":0,"post_id":"8525","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7696","mon_id":"1158790","chapter_id":"1158796","post_id":"8525","question":"\u0110iê\u0300u gi\u0300 xa\u0309y ra \u0111ô\u0301i v\u01a1\u0301i hê\u0323 sô\u0301 ma sa\u0301t gi\u01b0\u0303a 2 m\u0103\u0323t tiê\u0301p xu\u0301c nê\u0301u l\u01b0\u0323c pha\u0301p tuyê\u0301n e\u0301p hai m\u0103\u0323t tiê\u0301p xu\u0301c t\u0103ng lên?<\/p>","options":["A.<\/strong> T\u0103ng lên.","B.<\/strong> Gi\u1ea3m \u0111i.","C.<\/strong> Không \u0111\u1ed5i.","D.<\/strong> có th\u1ec3 t\u0103ng lên ho\u1eb7c gi\u1ea3m \u0111i."],"correct":"3","level":"1","hint":"","answer":"Ch\u1ecdn C.<\/strong> Không \u0111\u1ed5i.<\/span><\/p>H\u1ec7 s\u1ed1 ma sát ch\u1ec9 ph\u1ee5 thu\u1ed9c vào v\u1eadt li\u1ec7u và tình tr\u1ea1ng c\u1ee7a hai m\u1eb7t ti\u1ebfp xúc ⇒ Khi t\u0103ng l\u1ef1c pháp tuy\u1ebfn thì h\u1ec7 s\u1ed1 ma sát gi\u1eefa 2 m\u1eb7t ti\u1ebfp xúc không thay \u0111\u1ed5i<\/strong>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-24 09:51:07","option_type":"txt","len":2},{"id":"7698","mon_id":"1158790","chapter_id":"1158796","post_id":"8525","question":"Tuy ta không b\u1ecf qua l\u1ef1c c\u1ea3n c\u1ee7a không khí nh\u01b0ng ô tô v\u1eabn chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u vì<\/p>","options":["A.<\/strong> tr\u1ecdng l\u1ef1c cân b\u1eb1ng v\u1edbi ph\u1ea3n l\u1ef1c.","B.<\/strong> l\u1ef1c kéo cân b\u1eb1ng v\u1edbi l\u1ef1c ma sát v\u1edbi m\u1eb7t \u0111\u01b0\u1eddng.","C.<\/strong> các l\u1ef1c tác d\u1ee5ng vào ô tô cân b\u1eb1ng nhau.","D. <\/strong>tr\u1ecdng l\u1ef1c cân b\u1eb1ng v\u1edbi l\u1ef1c kéo."],"correct":"3","level":"1","hint":"V\u1eadn d\u1ee5ng \u0111\u1ecbnh lu\u1eadt I Newton: N\u1ebfu m\u1ed9t v\u1eadt không ch\u1ecbu tác d\u1ee5ng c\u1ee7a l\u1ef1c nào ho\u1eb7c ch\u1ecbu tác d\u1ee5ng c\u1ee7a các l\u1ef1c có h\u1ee3p l\u1ef1c b\u1eb1ng 0, thì v\u1eadt \u0111ang \u0111\u1ee9ng yên s\u1ebd ti\u1ebfp t\u1ee5c \u0111\u1ee9ng yên, \u0111ang chuy\u1ec3n \u0111\u1ed9ng s\u1ebd ti\u1ebfp t\u1ee5c chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u.<\/p>","answer":"Ch\u1ecdn C.<\/strong> các l\u1ef1c tác d\u1ee5ng vào ô tô cân b\u1eb1ng nhau.<\/span><\/p>Ô tô v\u1eabn chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u vì các l\u1ef1c tác d\u1ee5ng vào ô tô cân b\u1eb1ng nhau.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-24 09:52:58","option_type":"txt","len":3},{"id":"7699","mon_id":"1158790","chapter_id":"1158796","post_id":"8525","question":"M\u1ed9t v\u1eadt tr\u01b0\u1ee3t có ma sát trên m\u1ed9t m\u1eb7t ph\u1eb3ng n\u1eb1m ngang. N\u1ebfu v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt \u0111ó t\u0103ng lên 2 l\u1ea7n thì \u0111\u1ed9 l\u1edbn l\u1ef1c ma sát tr\u01b0\u1ee3t gi\u1eefa v\u1eadt và m\u1eb7t ti\u1ebfp xúc s\u1ebd <\/p>","options":["A.<\/strong> t\u0103ng 2 l\u1ea7n.","B.<\/strong> t\u0103ng 4 l\u1ea7n.","C.<\/strong> gi\u1ea3m 2 l\u1ea7n.","D.<\/strong> không \u0111\u1ed5i."],"correct":"4","level":"1","hint":"L\u1ef1c ma sát tr\u01b0\u1ee3t gi\u1eefa v\u1eadt và m\u1eb7t ti\u1ebfp xúc ph\u1ee5 thu\u1ed9c vào h\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t và áp l\u1ef1c.<\/p>","answer":"Ch\u1ecdn D.<\/strong> không \u0111\u1ed5i.<\/span><\/p>N\u1ebfu v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt \u0111ó t\u0103ng lên 2 l\u1ea7n thì \u0111\u1ed9 l\u1edbn l\u1ef1c ma sát tr\u01b0\u1ee3t gi\u1eefa v\u1eadt và m\u1eb7t ti\u1ebfp xúc s\u1ebd không \u0111\u1ed5i.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-24 09:54:26","option_type":"txt","len":2}]}