{"id":1223,"date":"2021-10-09T00:55:18","date_gmt":"2021-10-09T00:55:18","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=1223"},"modified":"2021-10-14T22:12:01","modified_gmt":"2021-10-14T15:12:01","slug":"cong-co-hoc-la-gi-tim-hieu-va-giai-dap-kien-thuc-vat-ly-8","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/cong-co-hoc-la-gi-tim-hieu-va-giai-dap-kien-thuc-vat-ly-8\/","title":{"rendered":"C\u00f4ng c\u01a1 h\u1ecdc l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u v\u00e0 gi\u1ea3i \u0111\u00e1p ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 8"},"content":{"rendered":"\n<script type=\"text\/javascript\">\nimg_numb = 10;\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\">Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u00fang ta v\u1eabn th\u01b0\u1eddng hay n\u00f3i v\u1ec1 c\u00f4ng, l\u00e0m c\u00f4ng, c\u00f4ng vi\u1ec7c. Th\u1ebf nh\u01b0ng, c\u00e1c em \u0111\u00e3 bi\u1ebft \u0111\u1ebfn c\u00f4ng c\u01a1 h\u1ecdc hay ch\u01b0a? Li\u1ec7u c\u00f3 ph\u1ea3i m\u1ecdi t\u1eeb \u201cc\u00f4ng\u201d \u0111\u1ec1u \u00e1m ch\u1ec9 c\u00f4ng c\u01a1 h\u1ecdc hay kh\u00f4ng? Tr\u00ean th\u1ef1c t\u1ebf, kh\u00f4ng ph\u1ea3i b\u1ea5t c\u1ee9 lo\u1ea1i c\u00f4ng n\u00e0o c\u0169ng l\u00e0 c\u00f4ng c\u01a1 h\u1ecdc. Lo\u1ea1i c\u00f4ng n\u00e0y l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn th\u1ee9c thu\u1ed9c b\u1ed9 m\u00f4n v\u1eadt l\u00fd. B\u00e0i h\u1ecdc trong ch\u01b0\u01a1ng tr\u00ecnh v\u1eadt l\u00fd 8 c\u00f9ng t\u00ean s\u1ebd gi\u1ea3i \u0111\u00e1p cho ch\u00fang ta t\u1ea5t c\u1ea3 \u0111i\u1ec1u n\u00e0y. C\u00e1c b\u1ea1n h\u00e3y c\u00f9ng ch\u00fang t\u00f4i t\u00ecm hi\u1ec3u v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y trong b\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay nh\u00e9!<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Work, Energy, and Power: Crash Course Physics #9\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/w4QFJb9a8vo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>Work, Energy, and Power: Crash Course Physics<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f4ng c\u01a1 h\u1ecdc l\u00e0 g\u00ec?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thu\u1eadt ng\u1eef c\u00f4ng c\u01a1 h\u1ecdc ch\u1ec9 \u0111\u01b0\u1ee3c d\u00f9ng khi c\u00f3 l\u1ef1c l\u00e0m cho m\u1ed9t v\u1eadt chuy\u1ec3n d\u1eddi hay di chuy\u1ec3n. Ch\u00fang ta c\u00f3 th\u1ec3 h\u00ecnh dung khi c\u00f3 m\u1ed9t l\u1ef1c l\u00e0m cho v\u1eadt di chuy\u1ec3n t\u1eeb v\u1ecb tr\u00ed n\u00e0y sang v\u1ecb tr\u00ed kh\u00e1c. Ch\u00fang ta n\u00f3i, trong tr\u01b0\u1eddng h\u1ee3p \u0111\u00f3 c\u00f3 c\u00f4ng c\u01a1 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> ra. \u0110\u00e2y c\u0169ng ch\u00ednh l\u00e0 \u0111i\u1ec1u l\u00fd gi\u1ea3i cho l\u00fd do v\u00ec sao kh\u00f4ng ph\u1ea3i b\u1ea5t c\u1ee9 t\u1eeb \u201cc\u00f4ng\u201d n\u00e0o c\u0169ng ch\u1ec9 lo\u1ea1i c\u00f4ng n\u00e0y. Trong cu\u1ed9c s\u1ed1ng th\u01b0\u1eddng ng\u00e0y, ch\u00fang ta g\u1eb7p ph\u1ea3i r\u1ea5t nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p sinh ra lo\u1ea1i c\u00f4ng n\u00e0y. Tuy nhi\u00ean, kh\u00f4ng ph\u1ea3i b\u1ea5t c\u1ee9 lo\u1ea1i l\u1ef1c n\u00e0o t\u00e1c d\u1ee5ng l\u00ean v\u1eadt c\u0169ng c\u00f3 th\u1ec3 sinh ra.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi x\u00e9t \u0111\u1ebfn c\u00f4ng c\u01a1 h\u1ecdc ch\u00fang ta c\u1ea7n ph\u1ea3i t\u00ecm ra l\u1ef1c ch\u00ednh t\u1ea1o ra \u0111i\u1ec1u n\u00e0y. \u0110\u00e2y c\u0169ng ch\u00ednh l\u00e0 \u0111i\u1ec1u m\u00e0 c\u00e1c em <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> l\u1edbp 8 c\u1ea7n ph\u1ea3i t\u00ecm ra khi l\u00e0m b\u00e0i. Lo\u1ea1i c\u00f4ng n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o hai y\u1ebfu t\u1ed1 ch\u00ednh. \u0110\u00f3 ch\u00ednh l\u00e0 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt v\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng v\u1eadt di chuy\u1ec3n. Tuy nhi\u00ean, khi ch\u00fang ta ph\u00e2n t\u00edch l\u1ef1c, ch\u00fang ta c\u1ea7n ph\u1ea3i xem x\u00e9t. \u0110\u00e2u l\u00e0 l\u1ef1c sinh c\u00f4ng, \u0111\u00e2u l\u00e0 l\u1ef1c kh\u00f4ng sinh c\u00f4ng. Nh\u01b0 v\u1eady khi t\u00ednh to\u00e1n m\u1edbi ch\u1ecdn ra \u0111\u01b0\u1ee3c \u0111\u00e1p \u00e1n \u0111\u00fang.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a c\u00f4ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thay \u0111\u1ed5i m\u1ed9t trong hai y\u1ebfu t\u1ed1 l\u1ef1c ho\u1eb7c qu\u00e3ng \u0111\u01b0\u1eddng v\u1eadt di chuy\u1ec3n. C\u00f4ng c\u01a1 h\u1ecdc \u0111\u01b0\u1ee3c sinh ra trong tr\u01b0\u1eddng h\u1ee3p \u0111\u00f3 c\u0169ng c\u00f3 s\u1ef1 thay \u0111\u1ed5i. \u0110\u1ed9 l\u1edbn c\u1ee7a lo\u1ea1i c\u00f4ng n\u00e0y ph\u1ee5 thu\u1ed9c v\u00e0o hai y\u1ebfu t\u1ed1. Khi c\u00e1c em mu\u1ed1n t\u0103ng hay gi\u1ea3m c\u00f4ng, c\u00e1c em ch\u1ec9 c\u1ea7n t\u0103ng ho\u1eb7c gi\u1ea3m m\u1ed9t trong hai y\u1ebfu t\u1ed1 n\u00e0y. Ngo\u00e0i ra, c\u00e1c em c\u0169ng c\u00f3 th\u1ec3 t\u0103ng ho\u1eb7c gi\u1ea3m c\u1ea3 hai \u0111\u1ec3 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn nh\u01b0 \u00fd. Trong b\u1ed9 m\u00f4n v\u1eadt l\u00fd, lo\u1ea1i c\u00f4ng n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi t\u1eaft l\u00e0 c\u00f4ng. V\u00ec v\u1eady, nhi\u1ec1u em s\u1ebd hi\u1ec3u nh\u1ea7m th\u00e0nh c\u00e1c lo\u1ea1i c\u00f4ng kh\u00e1c trong cu\u1ed9c s\u1ed1ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f4ng th\u1ee9c t\u00ednh c\u00f4ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u01b0 ch\u00fang ta \u0111\u00e3 n\u00f3i \u0111\u1ebfn \u1edf tr\u00ean, c\u00f4ng c\u01a1 h\u1ecdc ph\u1ee5 thu\u1ed9c v\u00e0o hai y\u1ebfu t\u1ed1 l\u00e0 l\u1ef1c v\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng. Ch\u00ednh v\u00ec v\u1eady, c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ednh lo\u1ea1i c\u00f4ng n\u00e0y c\u0169ng d\u1ef1a tr\u00ean \u0111\u1ed9 l\u1edbn c\u1ee7a hai y\u1ebfu t\u1ed1 n\u00e0y. C\u00e1c em c\u1ea7n ch\u00fa \u00fd, l\u1ef1c \u1edf \u0111\u00e2y ph\u1ea3i l\u00e0 l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt v\u00e0 sinh c\u00f4ng. Qu\u00e3ng \u0111\u01b0\u1eddng ph\u1ea3i l\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng m\u00e0 v\u1eadt di chuy\u1ec3n cho ch\u1ecbu l\u1ef1c t\u00e1c d\u1ee5ng sinh c\u00f4ng \u0111\u00f3 g\u00e2y ra. Ta c\u00f3 c\u00f4ng th\u1ee9c sau \u0111\u00e2y: A=F.s<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u00f3 A ch\u00ednh l\u00e0 k\u00ed hi\u1ec7u c\u1ee7a c\u00f4ng c\u01a1 h\u1ecdc hay c\u00f2n g\u1ecdi l\u00e0 \u0111\u1ed9 l\u1edbn c\u1ee7a c\u00f4ng. F ch\u00ednh l\u00e0 l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt sinh c\u00f4ng. C\u00f2n s l\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng m\u00e0 v\u1eadt di chuy\u1ec3n khi ch\u1ecbu l\u1ef1c t\u00e1c d\u1ee5ng. \u0110\u01a1n v\u1ecb c\u1ee7a c\u00f4ng l\u00e0 J (Jun). \u0110\u00e2y l\u00e0 \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf quy \u01b0\u1edbc cho lo\u1ea1i c\u00f4ng n\u00e0y. C\u00f3 nhi\u1ec1u \u0111\u01a1n v\u1ecb kh\u00e1c, c\u00e1c em c\u00f3 th\u1ec3 quy \u0111\u1ed5i khi l\u00e0m b\u00e0i cho ch\u00ednh x\u00e1c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, c\u00e1c em c\u0169ng c\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn \u0111\u01a1n v\u1ecb c\u1ee7a c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f2n l\u1ea1i. \u0110\u01a1n v\u1ecb c\u1ee7a l\u1ef1c trong c\u00f4ng th\u1ee9c l\u00e0 N (Newton). \u0110\u01a1n v\u1ecb c\u1ee7a s qu\u00e3ng \u0111\u01b0\u1eddng l\u00e0 m (m\u00e9t). N\u1ebfu d\u1eef ki\u1ec7n \u0111\u1ec1 b\u00e0i cho kh\u00f4ng \u0111\u00fang v\u1edbi nh\u1eefng quy chu\u1ea9n n\u00e0y. C\u00e1c em c\u1ea7n ph\u1ea3i ti\u1ebfn h\u00e0nh \u0111\u1ed5i tr\u01b0\u1edbc khi l\u1eafp v\u00e0o c\u00f4ng th\u1ee9c. T\u00ednh \u0111\u1ed9 l\u1edbn c\u1ee7a c\u00f4ng c\u01a1 h\u1ecdc kh\u00f4ng d\u1ec5 c\u0169ng kh\u00f4ng kh\u00f3. Vi\u1ec7c c\u1ea7n l\u00e0m, ch\u00ednh l\u00e0 ph\u00e2n t\u00edch l\u1ef1c chu\u1ea9n v\u00e0 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c l\u1ef1c n\u00e0o sinh c\u00f4ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f4ng th\u1ee9c t\u00ednh c\u00f4ng c\u01a1 h\u1ecdc l\u00e0 g\u00ec?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u00fa \u00fd khi t\u00ednh c\u00f4ng c\u01a1 h\u1ecdc<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ri\u00eang v\u1edbi ch\u1ee7 \u0111\u1ec1 n\u00e0y, c\u00e1c em c\u1ea7n ph\u1ea3i ghi nh\u1edb ch\u00fa \u00fd khi t\u00ednh c\u00f4ng c\u01a1 h\u1ecdc. Khi c\u00e1c em x\u00e1c \u0111\u1ecbnh v\u00e0 ph\u00e2n t\u00edch l\u1ef1c. Trong tr\u01b0\u1eddng h\u1ee3p v\u1eadt di chuy\u1ec3n vu\u00f4ng g\u00f3c v\u1edbi ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c t\u00e1c d\u1ee5ng. Th\u00ec c\u00f4ng c\u1ee7a l\u1ef1c l\u00fac n\u00e0y b\u1eb1ng 0. Hay n\u00f3i c\u00e1ch kh\u00e1c l\u00e0 l\u1ef1c n\u00e0y kh\u00f4ng sinh c\u00f4ng. L\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt n\u00e0y kh\u00f4ng ph\u1ea3i l\u1ef1c sinh c\u00f4ng. C\u00f4ng th\u1ee9c ph\u00eda tr\u00ean ch\u1ec9 \u00e1p d\u1ee5ng \u0111\u01b0\u1ee3c khi v\u1eadt chuy\u1ec3n d\u1eddi theo ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c t\u00e1c d\u1ee5ng. Ch\u00fa \u00fd n\u00e0y s\u1ebd gi\u00fap c\u00e1c em x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u00fang \u0111\u00e2u l\u00e0 l\u1ef1c sinh c\u00f4ng khi t\u00ednh to\u00e1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, c\u00e1c em c\u00f3 th\u1ec3 g\u1eb7p tr\u01b0\u1eddng h\u1ee3p v\u1eadt chuy\u1ec3n d\u1eddi kh\u00f4ng theo ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c t\u00e1c d\u1ee5ng. \u0110\u00e2y l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p kh\u00e1 \u0111\u1eb7c bi\u1ec7t. Th\u01b0\u1eddng ch\u1ec9 r\u01a1i v\u00e0o nh\u1eefng d\u1ea1ng b\u00e0i t\u1eadp n\u00e2ng cao. \u0110\u1ed1i v\u1edbi tr\u01b0\u1eddng h\u1ee3p n\u00e0y, c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u m\u1ed9t c\u00f4ng th\u1ee9c kh\u00e1c \u0111\u1ec3 t\u00ednh to\u00e1n. Th\u1ea7y c\u00f4 s\u1ebd h\u01b0\u1edbng d\u1eabn c\u00e1c em trong nh\u1eefng d\u1ea1ng b\u00e0i t\u1eadp \u0111\u1eb7c bi\u1ec7t nh\u01b0 v\u1eady. T\u00ednh c\u00f4ng c\u01a1 h\u1ecdc c\u00e1c em c\u1ea7n ch\u00fa \u00fd nhi\u1ec1u h\u01a1n so v\u1edbi c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng kh\u00e1c. \u0110\u00e2y c\u0169ng ch\u00ednh l\u00e0 l\u00fd do, nh\u1eefng b\u00e0i t\u1eadp thu\u1ed9c ch\u1ee7 \u0111\u1ec1 n\u00e0y th\u01b0\u1eddng kh\u00f3 h\u01a1n so v\u1edbi c\u00e1c b\u00e0i kh\u00e1c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hi\u1ec3u v\u1ec1 c\u00f4ng c\u01a1 h\u1ecdc c\u00e1c em c\u00f3 th\u1ec3 l\u00fd gi\u1ea3i \u0111\u01b0\u1ee3c t\u1ea1i sao v\u1eadt l\u1ea1i chuy\u1ec3n \u0111\u1ed9ng khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng. H\u01a1n c\u1ea3, c\u00e1c em bi\u1ebft \u0111\u01b0\u1ee3c \u0111\u00e2u m\u1edbi ch\u00ednh l\u00e0 l\u1ef1c l\u00e0m cho v\u1eadt chuy\u1ec3n \u0111\u1ed9ng. Th\u1ef1c t\u1ebf, m\u1ed9t v\u1eadt kh\u00f4ng ch\u1ec9 ch\u1ecbu duy nh\u1ea5t m\u1ed9t l\u1ef1c t\u00e1c d\u1ee5ng m\u00e0 c\u00f3 th\u1ec3 nhi\u1ec1u h\u01a1n. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fd do c\u00e1c em c\u1ea7n ph\u1ea3i h\u1ecdc hi\u1ec3u ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd \u0111\u1ec3 \u00e1p d\u1ee5ng trong cu\u1ed9c s\u1ed1ng th\u01b0\u1eddng ng\u00e0y.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"C\u00f4ng c\u01a1 h\u1ecdc - B\u00e0i 13 - V\u1eadt l\u00ed 8 - C\u00f4 Ph\u1ea1m Th\u1ecb H\u1eb1ng (HAY NH\u1ea4T)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/43PJdkgxgLE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>C\u00f4ng c\u01a1 h\u1ecdc<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5 th\u1ef1c t\u1ebf v\u1ec1 c\u00f4ng c\u01a1 h\u1ecdc<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 c\u00f4ng c\u01a1 h\u1ecdc<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed7i ch\u1ee7 \u0111\u1ec1 v\u1eadt l\u00fd \u0111\u1ec1u c\u00f3 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m, t\u1ef1 lu\u1eadn t\u01b0\u01a1ng \u1ee9ng. \u0110\u1ed1i v\u1edbi hai d\u1ea1ng b\u00e0i n\u00e0y, ch\u1eafc h\u1eb3n c\u00e1c em \u0111\u00e3 kh\u00f4ng c\u00f2n xa l\u1ea1. Tuy nhi\u00ean ch\u00fang t\u00f4i v\u1eabn s\u1ebd t\u1ed5ng h\u1ee3p c\u00e1ch l\u00e0m v\u00e0 v\u00ed d\u1ee5 \u0111\u1ec3 c\u00e1c em tham kh\u1ea3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi d\u1ea1ng b\u00e0i tr\u1eafc nghi\u1ec7m, c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn c\u00e1c \u0111\u00e1p \u00e1n cho s\u1eb5n. Th\u00f4ng th\u01b0\u1eddng \u1edf nh\u1eefng c\u00e2u h\u1ecfi n\u00e0y, ng\u01b0\u1eddi ta s\u1ebd ch\u1ec9 xoay quanh l\u00fd thuy\u1ebft v\u00e0 v\u1eadn d\u1ee5ng th\u1ea5p. C\u00e1c em ch\u1ec9 c\u1ea7n nh\u1edb r\u00f5 v\u1ec1 l\u00fd thuy\u1ebft c\u00f4ng c\u01a1 h\u1ecdc \u0111\u1ec3 ch\u1ecdn \u0111\u01b0\u1ee3c \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c nh\u1ea5t. Nh\u1eefng c\u00e2u t\u00ednh to\u00e1n trong ph\u1ea7n tr\u1eafc nghi\u1ec7m th\u01b0\u1eddng l\u00e0 c\u00e2u l\u1eafp c\u00f4ng th\u1ee9c. C\u00e1c em ch\u1ec9 c\u1ea7n t\u00ednh to\u00e1n c\u1ea9n th\u1eadn \u0111\u1ec3 ch\u1ecdn \u0111\u01b0\u1ee3c \u0111\u00e1p \u00e1n \u0111\u00fang \u0111\u01a1n v\u1ecb, \u0111\u00fang k\u1ebft qu\u1ea3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc? Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt v\u00e0 v\u1eadt chuy\u1ec3n \u0111\u1ed9ng theo ph\u01b0\u01a1ng vu\u00f4ng g\u00f3c v\u1edbi ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt v\u00e0 v\u1eadt chuy\u1ec3n \u0111\u1ed9ng theo ph\u01b0\u01a1ng kh\u00f4ng vu\u00f4ng g\u00f3c v\u1edbi ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt nh\u01b0ng v\u1eadt v\u1eabn \u0111\u1ee9ng y\u00ean.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i t\u1eadp t\u1ef1 lu\u1eadn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ebfn v\u1edbi d\u1ea1ng b\u00e0i t\u1ef1 lu\u1eadn, c\u00e1c em s\u1ebd c\u1ea7n l\u00e0m nhi\u1ec1u b\u01b0\u1edbc h\u01a1n. \u0110\u1ed1i v\u1edbi b\u00e0i ch\u01b0a c\u00f3 h\u00ecnh v\u1ebd. C\u00e1c em s\u1ebd ph\u1ea3i x\u00e1c \u0111\u1ecbnh h\u00ecnh v\u1ebd sau \u0111\u00f3 ph\u00e2n t\u00edch l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt theo \u0111\u1ec1 b\u00e0i. L\u01b0u \u00fd l\u00e0 ph\u1ea3i ph\u00e2n t\u00edch \u0111\u1ea7y \u0111\u1ee7 l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt. Ch\u1ec9 c\u1ea7n thi\u1ebfu 1 l\u1ef1c, c\u00e1c em c\u0169ng c\u00f3 th\u1ec3 l\u00e0m sai b\u00e0i. Sau khi ph\u00e2n t\u00edch l\u1ef1c, c\u00e1c em c\u1ea7n x\u00e1c \u0111\u1ecbnh ph\u01b0\u01a1ng chi\u1ec1u. \u0110\u00e2u l\u00e0 l\u1ef1c ch\u00ednh t\u00e1c d\u1ee5ng l\u00ean v\u1eadt sinh c\u00f4ng? C\u00e1c em c\u1ea7n t\u00ednh \u0111\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c \u0111\u00f3 d\u1ef1a theo g\u1ee3i \u00fd c\u1ee7a \u0111\u1ec1 b\u00e0i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f3 th\u1ec3 \u0111\u1ec1 s\u1ebd kh\u00f4ng cho s\u1eb5n c\u00e1c em qu\u00e3ng \u0111\u01b0\u1eddng di chuy\u1ec3n c\u1ee7a v\u1eadt, hay \u0111\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c. C\u00e1c em ph\u1ea3i t\u1ef1 t\u00ecm t\u1eeb nh\u1eefng g\u1ee3i \u00fd \u0111\u1ec1 b\u00e0i \u0111\u00e3 cho. Sau khi t\u00ednh, c\u00e1c em c\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn \u0111\u01a1n v\u1ecb c\u1ee7a c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng. Cu\u1ed1i c\u00f9ng, c\u00e1c em m\u1edbi c\u00f3 th\u1ec3 l\u1eafp v\u00e0o c\u00f4ng th\u1ee9c t\u00ednh l\u1ef1c sinh c\u00f4ng. \u0110\u00e2y ch\u00ednh l\u00e0 c\u00e1c b\u01b0\u1edbc c\u01a1 b\u1ea3n \u0111\u1ec3 l\u00e0m b\u00e0i t\u1eadp t\u1ef1 lu\u1eadn ch\u1ee7 \u0111\u1ec1 n\u00e0y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng l\u00fd thuy\u1ebft v\u00e0 v\u00ed d\u1ee5 minh h\u1ecda cho ch\u1ee7 \u0111\u1ec1 l\u1ef1c sinh c\u00f4ng. Hy v\u1ecdng b\u00e0i vi\u1ebft c\u1ee7a ch\u00fang t\u00f4i c\u00f3 th\u1ec3 gi\u00fap c\u00e1c em l\u00e0m b\u00e0i t\u1ed1t h\u01a1n. C\u1ea3m \u01a1n c\u00e1c em \u0111\u00e3 \u0111\u00f3n \u0111\u1ecdc b\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Xem th\u00eam<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Work and Energy\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/zVRH9d5PW8g?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>What is work?<\/figcaption><\/figure>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Ch\u00fang ta v\u1eabn th\u01b0\u1eddng hay n\u00f3i v\u1ec1 c\u00f4ng, l\u00e0m c\u00f4ng, c\u00f4ng vi\u1ec7c. Th\u1ebf nh\u01b0ng, c\u00e1c em \u0111\u00e3 bi\u1ebft \u0111\u1ebfn c\u00f4ng c\u01a1 h\u1ecdc hay ch\u01b0a? Li\u1ec7u c\u00f3 ph\u1ea3i m\u1ecdi t\u1eeb \u201cc\u00f4ng\u201d \u0111\u1ec1u \u00e1m ch\u1ec9 c\u00f4ng c\u01a1 h\u1ecdc hay kh\u00f4ng? Tr\u00ean th\u1ef1c t\u1ebf, kh\u00f4ng ph\u1ea3i b\u1ea5t c\u1ee9 lo\u1ea1i c\u00f4ng n\u00e0o c\u0169ng [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2382,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[4,7],"tags":[],"class_list":["post-1223","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1223","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=1223"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1223\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media\/2382"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1223"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1223"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}