Nā ʻatikala physics e pili ana i nā hanana kūlohelohe a pēlā aku e pili ana i ka physics.
He nui vector ka hoʻolalelale ʻana , he nui kino nona ka nui a me ke kuhikuhi. ʻO kona hōʻailona he ( hoʻolalelale ) . ʻO kona anakahi honua he mika no kekona kuea, i hoʻopōkole ʻia m/s 2.
Ka wikiwiki awelika
Laʻana pilikia.
He kaʻa i kū mua no 5 kekona a laila neʻe i ka hikina ma ka wikiwiki o 10 m/s. E hoʻoholo i ka wikiwiki awelika.
Pahana
Inā ʻoe e paʻi i kahi puke ma luna o kahi papaʻaina a hiki i ka neʻe ʻana, ke hana nei ʻoe i ka hana ma luna o ka puke. Ke hāʻule kahi mea i luna o ka honua no ka mea ua huki ʻia e ka ikaika o ke koʻikoʻi , hana ka ikaika o ke koʻikoʻi ma luna o ka mea. I ka ʻaoʻao ʻē aʻe, inā ʻoe e paʻi i kahi mea me kou ikaika a pau a pulu ʻoe i ka hou akā ʻaʻole neʻe ka mea, ʻaʻole ʻoe i hana i ka hana ma luna o ka mea. I ke ola o kēlā me kēia lā, ua ʻōlelo ʻia ua hana ʻoe i ka hana a i ʻole ka hana nui e paʻi ana i kahi mea, akā e like me ke ʻano o ka physics, ʻaʻole ʻoe i hana i ka hana ma luna o ka mea no ka mea ʻaʻole ʻike ka mea i ka neʻe ʻana (ʻaʻole e loli kahi o ka mea).
Mea Momentum Angular
ʻO ka mea e hana ana neʻe pololei Loaʻa iā ia ka momentum hiki ke helu ʻia me ka hoʻohana ʻana i ke ʻano hana:
p = mv
ʻIkepili:
p = momentum (ʻo ke anakahi honua he kilokani mika / kekona, i hoʻopōkole ʻia kg m/s)
m = ka nuipa (ʻo ke anawaena honua he kilokani, i hoʻopōkole ʻia kg)
v = ka wikiwiki (ʻo ke anawaena honua he mika / kekona, i hoʻopōkole ʻia m/s)
ʻO ka nui kino i ka neʻe wili e like me ka nuipa (m) i ka neʻe pololei ʻana manawa o ka inertia (I). ʻO ka nui kino i ka neʻe ʻana o ka wili e like me ka wikiwiki (v) i ka neʻe pololei ʻana, ʻo ia ka wikiwiki kihiNo laila, he momentum ko kahi mea e wili ana i hiki ke helu ʻia me ka hoʻohana ʻana i ke ʻano hana:
Mea Manawa o ka Inertia
ʻElua mau mea, ʻo kekahi he nuipaʻa liʻiliʻi a ʻo kekahi he nuipaʻa nui aʻe. ʻO wai ka mea i maʻalahi ke neʻe inā paʻi ʻia me ka ikaika like? Hōʻike ka ʻoiaʻiʻo he maʻalahi ke neʻe ʻana o nā mea me ka nuipaʻa liʻiliʻi ma mua o nā mea me ka nuipaʻa nui aʻe. No laila, ʻo ka nui o ka nuipaʻa o ka mea e hoʻoholo ai i ka nui o ka wikiwiki o ka mea inā hoʻopili ʻia kahi ikaika. Inā ma ka neʻe pololei, ʻo ka nuipaʻa o kahi mea e hoʻoholo ai inā maʻalahi a paʻakikī paha ka neʻe ʻana o kahi mea (e hoʻolalelale) a laila ma ka neʻe wili, ʻo ka manawa o ka inertia o kahi mea e hoʻoholo ai inā maʻalahi a paʻakikī paha ka neʻe ʻana o kahi mea.
Mea Manawa o ka Ikaika (Torque)
Nā Lima Kaila
E noʻonoʻo i kahi mea e wili ana, e like me ka puka. Ke wehe ʻia a pani ʻia paha ka puka, e wili ia. ʻO ka hinge e hoʻopili ana i ka puka i ka paia e hana ma ke ʻano he axis o ka wili ʻana.
Kiʻi o ka puka i ʻike ʻia mai luna mai. E noʻonoʻo i kahi laʻana kahi i paʻi ʻia ai kahi puka me nā ikaika ʻelua, kahi i like ai ka nui a me ke kuhikuhi o nā ikaika ʻelua; kū pololei ke kuhikuhi o ka ikaika i ka puka.
Ma mua, ua aʻo ʻoe i ke kānāwai ʻelua o Newton i hōʻike ʻia ma o ka hoohalike:
Wehewehe kēia kaulike i ka pilina ma waena o ka ikaika hopena, i ʻike ʻia hoʻi ʻo ka ikaika upena, a me ka nuipa a me ka wikiwiki. ʻO ka ikaika hopena e hana ana ma luna o kahi mea me ka nuipa ke kumu o ka wikiwiki o ka mea.
I kēia manawa e hoʻolauna mākou i kahi ʻano ʻē aʻe o ke kānāwai ʻelua o Newton, ka mea e wehewehe ana i ka pilina ma waena o ka ikaika hopena a me nā loli o ka momentum.
He nui vector ka wikiwiki , ʻoiai he nui scalar ka velocity . Loaʻa i ka wikiwiki ka nui a me ke kuhikuhi, ʻoiai he nui wale nō ka velocity. ʻO ke anakahi honua he mika i kekona, i hoʻopōkole ʻia ʻo m/s a i ʻole ms -1 . ʻO kona hōʻailona ʻo v ( velocity ).
ʻO ka wikiwiki awelika a me ka wikiwiki awelika
E aʻo pū i nā laʻana o ka wikiwiki tangential a me ka wikiwiki angular.
Inā wili kahi mea i ka ʻaoʻao ʻākau a hoʻopau i hoʻokahi wili ʻana (360o) i loko o 1 kekona, a laila ʻo ka wikiwiki angular o nā ʻāpana āpau o ka peʻahi he 1 wili/kekona = 360o / kekona = 6,28 radians/kekona a ʻo ke kuhikuhi o ka wikiwiki angular ma ka ʻaoʻao ʻākau. Inā he 20 cm ka radius o ka peʻahi, neʻe ka lihi o ka peʻahi i loko o kahi pōʻai me ka wikiwiki o (2)(3,14)(20 cm) / 1 kekona = 125,6 cm/s = 1,256 m/s. ʻO kahi kiko 1 cm (0,01 m) mai ke axis e neʻe ana i loko o kahi pōʻai me ka wikiwiki o (2)(3,14)(1 cm) / 1 kekona = 6,28 cm/s = 0,0628 m/s. ʻO ka liʻiliʻi o r, ʻo ka liʻiliʻi o ka wikiwiki. I ka neʻe pōʻai , kapa pinepine ʻia ka wikiwiki he wikiwiki tangential. Kapa ʻia ʻo ia he tangential no ka mea ʻo ke kuhikuhi o ka wikiwiki he tangential mau i ke ala pōʻai.
Ke Hoʻomaopopo nei i ka Mamao
ʻO ka mamao ka lōʻihi o ke ala i hele ʻia e kahi mea. He nui scalar ka mamao, he nui kino nona ka nui wale nō a ʻaʻohe kuhikuhi. ʻO ke anakahi honua o ka mamao ʻo ka mika, i hoʻopōkole ʻia ʻo m. ʻO ka hōʻailona no ka mamao ʻo s.
Ka Wehewehena o ka Neʻe ʻana
ʻO ka neʻe ʻana ka loli o ke kūlana o kahi mea. He nui vector ka neʻe ʻana, he nui kino nona ka nui a me ke kuhikuhi. Hiki ke hōʻike ʻia ke kuhikuhi o ka neʻe ʻana ma ke ʻano he kuhikuhi cardinal (ʻākau, hikina, hema, komohana, a pēlā aku) a i ʻole e hoʻohana i nā huaʻōlelo hema, ʻākau, luna, a i ʻole i lalo.
Ke kānāwai o ka mālama ʻana i ka momentum angular ua ʻōlelo ʻia inā ka hopena o ka ikaika i loko o kahi mea paʻa e wili ana, ʻo ka waiwai he zero a laila ka ikaika kihi He mea paʻa i ka neʻe ʻana o ka wili mau. Hiki ke loaʻa ke ʻano no ke kānāwai o ka mālama ʻana i ka momentum angular ma ke ʻano makemakika ma ka hoʻololi ʻana i ke ʻano no ke kānāwai ʻelua o ka neʻe ʻana o Newton no ka momentum angular.
