Động năng và thế năng

Home Lớp 10 Vật lý 10 - Sách kết nối tri thức Bài 25. Động năng và thế năng.Bài tập cơ bản

{"common":{"save":0,"post_id":"8776","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8224","mon_id":"1158790","chapter_id":"1159772","post_id":"8776","question":"\u0110\u1ed9ng n\u0103ng c\u1ee7a m\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng m, chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c v là:<\/p>","options":["A.<\/strong> $W_\u0111=\\dfrac{1}{2}mv$<\/span>.","B.<\/strong> $W_\u0111=mv^2$<\/span>.","C.<\/strong> $W_\u0111=2mv^2$<\/span>.","D.<\/strong> $W_\u0111=\\dfrac{1}{2}mv^2$<\/span>."],"correct":"4","level":"1","hint":"","answer":"Ch\u1ecdn D.<\/strong> $W_\u0111=\\dfrac{1}{2}mv^2$<\/span>.<\/span><\/p>\u0110\u1ed9ng n\u0103ng c\u1ee7a m\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng m, chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c v là $W_\u0111=\\dfrac{1}{2}mv^2$<\/span>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-04-07 09:08:35","option_type":"math","len":0},{"id":"8226","mon_id":"1158790","chapter_id":"1159772","post_id":"8776","question":"Chi\u0309 ra câu sai <\/strong>trong ca\u0301c pha\u0301t biê\u0309u sau:<\/p>(1). Thê\u0301 n\u0103ng cu\u0309a mô\u0323t vâ\u0323t co\u0301 ti\u0301nh t\u01b0\u01a1ng \u0111ô\u0301i. Thê\u0301 n\u0103ng ta\u0323i mô\u0303i vi\u0323 tri\u0301 co\u0301 thê\u0309 co\u0301 gia\u0301 tri\u0323 kha\u0301c nhau tu\u0300y theo ca\u0301ch cho\u0323n gô\u0301c to\u0323a \u0111ô\u0323. (2). \u0110ô\u0323ng n\u0103ng cu\u0309a mô\u0323t vâ\u0323t chi\u0309 phu\u0323 thuô\u0323c khô\u0301i l\u01b0\u01a1\u0323ng va\u0300 vâ\u0323n tô\u0301c cu\u0309a vâ\u0323t. Thê\u0301 n\u0103ng chi\u0309 phu\u0323 thuô\u0323c vi\u0323 tri\u0301 t\u01b0\u01a1ng \u0111ô\u0301i gi\u01b0\u0303a ca\u0301c phâ\u0300n cu\u0309a hê\u0323 v\u01a1\u0301i \u0111iê\u0300u kiê\u0323n l\u01b0\u0323c t\u01b0\u01a1ng ta\u0301c trong hê\u0323 la\u0300 l\u01b0\u0323c thê\u0301. (3). Công cu\u0309a tro\u0323ng l\u01b0\u0323c luôn luôn la\u0300m gia\u0309m thê\u0301 n\u0103ng nên công cu\u0309a tro\u0323ng l\u01b0\u0323c luôn luôn d\u01b0\u01a1ng. (4). Thê\u0301 n\u0103ng cu\u0309a qua\u0309 câ\u0300u d\u01b0\u01a1\u0301i ta\u0301c du\u0323ng cu\u0309a l\u01b0\u0323c \u0111a\u0300n hô\u0300i cu\u0303ng la\u0300 thê\u0301 n\u0103ng \u0111a\u0300n hô\u0300i. <\/p>","options":["A.<\/strong> Phát bi\u1ec3u 2.","B.<\/strong> Phát bi\u1ec3u 4.","C.<\/strong> Phát bi\u1ec3u 3.","D.<\/strong> Phát bi\u1ec3u 1."],"correct":"3","level":"1","hint":"","answer":"Ch\u1ecdn C.<\/strong> Phát bi\u1ec3u 3.<\/span><\/p>(1). Thê\u0301 n\u0103ng cu\u0309a mô\u0323t vâ\u0323t co\u0301 ti\u0301nh t\u01b0\u01a1ng \u0111ô\u0301i. Thê\u0301 n\u0103ng ta\u0323i mô\u0303i vi\u0323 tri\u0301 co\u0301 thê\u0309 co\u0301 gia\u0301 tri\u0323 kha\u0301c nhau tu\u0300y theo ca\u0301ch cho\u0323n gô\u0301c to\u0323a \u0111ô\u0323. (\u0111úng)<\/strong><\/span> (2). \u0110ô\u0323ng n\u0103ng cu\u0309a mô\u0323t vâ\u0323t chi\u0309 phu\u0323 thuô\u0323c khô\u0301i l\u01b0\u01a1\u0323ng va\u0300 vâ\u0323n tô\u0301c cu\u0309a vâ\u0323t. Thê\u0301 n\u0103ng chi\u0309 phu\u0323 thuô\u0323c vi\u0323 tri\u0301 t\u01b0\u01a1ng \u0111ô\u0301i gi\u01b0\u0303a ca\u0301c phâ\u0300n cu\u0309a hê\u0323 v\u01a1\u0301i \u0111iê\u0300u kiê\u0323n l\u01b0\u0323c t\u01b0\u01a1ng ta\u0301c trong hê\u0323 la\u0300 l\u01b0\u0323c thê\u0301. (\u0111úng)<\/strong><\/span><\/span> (3). Công cu\u0309a tro\u0323ng l\u01b0\u0323c luôn luôn la\u0300m gia\u0309m thê\u0301 n\u0103ng nên công cu\u0309a tro\u0323ng l\u01b0\u0323c luôn luôn d\u01b0\u01a1ng. (sai<\/strong> <\/span><\/span>vì trong tr\u01b0\u1eddng h\u1ee3p nâng v\u1eadt lên thì l\u1ef1c nâng sinh công d\u01b0\u01a1ng, còn tr\u1ecdng l\u1ef1c sinh công âm)<\/strong>.<\/span><\/span><\/span><\/span> (4). Thê\u0301 n\u0103ng cu\u0309a qua\u0309 câ\u0300u d\u01b0\u01a1\u0301i ta\u0301c du\u0323ng cu\u0309a l\u01b0\u0323c \u0111a\u0300n hô\u0300i cu\u0303ng la\u0300 thê\u0301 n\u0103ng \u0111a\u0300n hô\u0300i. (\u0111úng)<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-04-07 09:16:22","option_type":"txt","len":2},{"id":"8227","mon_id":"1158790","chapter_id":"1159772","post_id":"8776","question":"M\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng m, \u0111\u1eb7t \u1edf \u0111\u1ed9 cao h so v\u1edbi m\u1eb7t \u0111\u1ea5t trong tr\u1ecdng tr\u01b0\u1eddng c\u1ee7a Trái \u0110\u1ea5t thì th\u1ebf n\u0103ng tr\u1ecdng tr\u01b0\u1eddng c\u1ee7a v\u1eadt \u0111\u01b0\u1ee3c xác \u0111\u1ecbnh theo công th\u1ee9c nào? Ch\u1ecdn m\u1ed1c tính th\u1ebf n\u0103ng \u1edf m\u1eb7t \u0111\u1ea5t.<\/p>","options":["A.<\/strong> $W_t=mgh$<\/span>.","B.<\/strong> $W_t=\\dfrac{1}{2}mgh$<\/span>.","C.<\/strong> $W_t=mg$<\/span>.","D.<\/strong> $W_t=mh$<\/span>."],"correct":"1","level":"1","hint":"","answer":"Ch\u1ecdn A.<\/strong> $W_t=mgh$<\/span>.<\/span><\/p>M\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng m, \u0111\u1eb7t \u1edf \u0111\u1ed9 cao h so v\u1edbi m\u1eb7t \u0111\u1ea5t trong tr\u1ecdng tr\u01b0\u1eddng c\u1ee7a Trái \u0110\u1ea5t thì th\u1ebf n\u0103ng tr\u1ecdng tr\u01b0\u1eddng c\u1ee7a v\u1eadt \u0111\u01b0\u1ee3c xác \u0111\u1ecbnh theo công th\u1ee9c $W_t=mgh$<\/span>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-04-07 09:18:10","option_type":"math","len":0}]}