Lực ma sát - trung bình

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

{"common":{"save":0,"post_id":"8526","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7703","mon_id":"1158790","chapter_id":"1158796","post_id":"8526","question":"Trong các tr\u01b0\u1eddng h\u1ee3p d\u01b0\u1edbi \u0111ây tr\u01b0\u1eddng h\u1ee3p nào ma sát có ích?<\/p>","options":["A.<\/strong> Ma sát làm mòn l\u1ed1p xe.","B.<\/strong> Ma sát làm ô tô qua \u0111\u01b0\u1ee3c ch\u1ed7 l\u1ea7y.","C.<\/strong> Ma sát sinh ra gi\u1eefa tr\u1ee5c xe và bánh xe. ","D.<\/strong> Ma sát sinh ra khi v\u1eadt tr\u01b0\u1ee3t trên m\u1eb7t sàn."],"correct":"2","level":"2","hint":"","answer":"Ch\u1ecdn B.<\/strong> Ma sát làm ô tô qua \u0111\u01b0\u1ee3c ch\u1ed7 l\u1ea7y.<\/span><\/p>Ma sát làm ô tô qua \u0111\u01b0\u1ee3c ch\u1ed7 l\u1ea7y là tr\u01b0\u1eddng h\u1ee3p ma sát có ích.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-24 10:00:53","option_type":"txt","len":3},{"id":"7704","mon_id":"1158790","chapter_id":"1158796","post_id":"8526","question":"Ch\u1ecdn câu \u0111úng <\/strong>trong các phát bi\u1ec3u sau \u0111ây.<\/p>","options":["A.<\/strong> H\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t ph\u1ee5 thu\u1ed9c vào di\u1ec7n tích b\u1ec1 m\u1eb7t ti\u1ebfp xúc gi\u1eefa hai v\u1eadt.","B.<\/strong> H\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t ph\u1ee5 thu\u1ed9c vào b\u1ea3n ch\u1ea5t b\u1ec1 m\u1eb7t ti\u1ebfp xúc gi\u1eefa hai v\u1eadt.","C. <\/strong>H\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t ph\u1ee5 thu\u1ed9c áp l\u1ef1c lên m\u1eb7t ti\u1ebfp xúc.","D.<\/strong> H\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t t\u1ec9 l\u1ec7 v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng hai v\u1eadt ti\u1ebfp xúc."],"correct":"2","level":"2","hint":"","answer":"Ch\u1ecdn B.<\/strong> H\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t ph\u1ee5 thu\u1ed9c vào b\u1ea3n ch\u1ea5t b\u1ec1 m\u1eb7t ti\u1ebfp xúc gi\u1eefa hai v\u1eadt.<\/span><\/p>A – sai, h\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t không ph\u1ee5 thu\u1ed9c vào di\u1ec7n tích b\u1ec1 m\u1eb7t ti\u1ebfp xúc gi\u1eefa hai v\u1eadt. B – \u0111úng. C – sai, h\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t không ph\u1ee5 thu\u1ed9c áp l\u1ef1c lên m\u1eb7t ti\u1ebfp xúc. D – sai, h\u1ec7 s\u1ed1 ma sát tr\u01b0\u1ee3t không t\u1ec9 l\u1ec7 v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng hai v\u1eadt ti\u1ebfp xúc.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-24 10:02:24","option_type":"txt","len":3},{"id":"7706","mon_id":"1158790","chapter_id":"1158796","post_id":"8526","question":"Ch\u1ecdn câu sai<\/strong>.<\/p>","options":["A.<\/strong> L\u1ef1c ma sát tr\u01b0\u1ee3t ch\u1ec9 xu\u1ea5t hi\u1ec7n khi có s\u1ef1 tr\u01b0\u1ee3t t\u01b0\u01a1ng \u0111\u1ed1i gi\u1eefa v\u1eadt này lên v\u1eadt khác.","B.<\/strong> H\u01b0\u1edbng c\u1ee7a l\u1ef1c ma sát tr\u01b0\u1ee3t ti\u1ebfp tuy\u1ebfn v\u1edbi m\u1eb7t ti\u1ebfp xúc và ng\u01b0\u1ee3c chi\u1ec1u chuy\u1ec3n \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i.","C.<\/strong> Viên g\u1ea1ch n\u1eb1m yên trên m\u1eb7t ph\u1eb3ng nghiêng nh\u1edd có tác d\u1ee5ng c\u1ee7a l\u1ef1c ma sát.","D. <\/strong>L\u1ef1c ma sát tr\u01b0\u1ee3t tác d\u1ee5ng lên v\u1eadt luôn l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt \u0111ó."],"correct":"4","level":"2","hint":"","answer":"Câu sai là D. <\/strong>L\u1ef1c ma sát tr\u01b0\u1ee3t tác d\u1ee5ng lên v\u1eadt luôn l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt \u0111ó.<\/span><\/p>A, B, C – \u0111úng. D – sai, l\u1ef1c ma sát tr\u01b0\u1ee3t tác d\u1ee5ng lên v\u1eadt luôn nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt \u0111ó.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-24 10:03:52","option_type":"txt","len":3}]}