Ifomula isisindo

Ekuphileni kwethu kwansuku zonke futhi ekuphileni kwansuku zonke welithi "mass" futhi "isisindo" ifana, nakuba inani semantic ka ngokuyinhloko yabo ehlukene. Ubuza Uthi, "Yini isisindo sakho?" sisho "Bangaki amakhilogremu wena?". Noma kunjalo, umbuzo ngawo sizama ukuthola leli qiniso, impendulo alinikwa e khilogremu, futhi newtons. Ngiye emuva physics esikoleni Yiqiniso.

isisindo umzimba - eliningi ngazo amandla ngalo umzimba ucindezela ukusekelwa noma ukumiswa.

Ukuze uqhathanise, esisindo ngaphambilini cishe lichazwa ngokuthi "inani into", definition yesimanje Ngakho:

Isisindo - ubuningi ngokomzimba sibonakalisa ikhono yomzimba inertial futhi okudonsa eyisilinganiso lwezici zalo.

Nokho, Umqondo mass ngokuvamile kancane ebanzi kuka lapha, umsebenzi wethu uhlukile. Kwanele ukuqonda iqiniso umehluko langempela phakathi mass nesisindo.

Ngaphezu kwalokho, yokukala isisindo - isisindo, isisindo (njengoba uhlobo amandla) - Newtons.

Futhi, mhlawumbe okubaluleke kakhulu, umehluko isisindo abangelwa yisisindo iqukethe ngokwako isisindo ifomula ukuthi libukeka kanje:

P = mg

lapho P - isisindo langempela (e Newtons), m - isisindo salo e kg, futhi g - ukusheshisa adonsela phansi, okuyinto ngokuvamile ivezwa ngendlela 9.8 N / kg.

Ngamanye amazwi, isisindo ifomula singakuqonda ngokubheka isibonelo esilandelayo:

Isisindo 1 kg imiswe okwesikhashana kusukela dynamometer umile, ukuze anqume isisindo salo. Njengoba umzimba, kanye dynamometer uqobo, noma unganyakazi, kumelwe isisindo salo siphindwe ukusheshisa ngokuwa khulula. Sine: 1 (kg) x 9.8 (N / kg) = 9.8 N. Le mandla izenzo kanye nesisindo dynamometer isiphanyeko. Ngakho-ke kuyacaca ukuthi isisindo somzimba elilingana amandla adonsela phansi. Nokho, lokhu akusho ngaso sonke isikhathi kunjalo.

Sekuyisikhathi aveza iphuzu elibalulekile. Isisindo ifomula ilingana ibutho ifomula adonsela phansi kuphela kulezi zimo ezilandelayo:

• umzimba usesimweni lokuphumula;
• emzimbeni akuyona amandla Archimedes (buoyancy). Kuvele iqiniso elithakazelisayo ngale buoyancy: it is ukuthi umzimba emanzini, displaces umthamo wamanzi elilingana isisindo sayo ezaziwayo. Kodwa umane odlulela amanzi, umzimba iba "kulula" ku umthamo wamanzi dengwane. Yingakho kuphakamisa emanzini Owesifazane enesisindo kg 60 kungenziwa bayazidlalela futhi zihleka, kodwa phezu makakutholele eliyinkimbinkimbi kakhulu.

Lapho okungajwayelekile emzimbeni ukunyakaza, ngamanye amazwi, lapho umzimba kanye nokumiswa kuhamba ukusheshisa a, eshintsha ukubukeka kwayo nesisindo ifomula. lo mkhuba physics ukushintsha kancane, kodwa ku-formula ushintsho olunjalo ziyabonakala kanje:

P = m (ga).

Njengoba kungenziwa indawo isisindo ifomula kungenzeka negative, kodwa ukuthi ukushesha lapho ihamba umzimba, kufanele sibe ngaphezu ukusheshisa okudonsa izinto. Futhi lapha aphinde kubalulekile ukuhlukanisa phakathi isisindo nenqwaba: isisindo negative ayitsintseki mass (izakhiwo umzimba akukashintshi), kodwa empeleni sithunyelwa kolunye uhlangothi.

ImiBhalo eyizibonelo ezinhle we lift yashesha: nge ukushesha lwayo olucijile esikhathini esifushane kubonakala "ukudonsa ophahleni." Ngomuzwa ezinjalo, yebo, nazo ngokwanele nje. nzima kakhulu ukuzwa isimo weightlessness, okuyinto nomuzwa ngokugcwele osomkhathi emzileni.

Weightlessness - eqinisweni, ukuntuleka isisindo. Ukuze lokhu kwakunokwenzeka, ukusheshisa, ngawo uhamba emzimbeni, ukuba alingane notorious usoreniyu g (9,8 N / kg). Ukuze sifinyelele mphumela kuyinto elula ku ongaphakeme Umhlaba orbit. Gravity, okusho ukukhangwa, namanje enza umzimba (satellite), kodwa azinakwa. Futhi ukusheshisa drift umzila wokuzungeza siphuphutheki avame zero. Bese kuba khona nomphumela yokuntuleka isisindo, ngoba umzimba akusho mbeni noma ukwesekwa noma ukumiswa, kodwa umane lubhakuza emoyeni.

Ngokwengxenye kungenzeka lo mphumela nazo ngesikhathi ukusuka. Okomzuzwana kunomuzwa yokumiswa emoyeni ngalesi ukusheshisa iphuzu esishukumisela indiza, ilingana ukusheshisa ngokuwa khulula.

Ukubuyela futhi umehluko isisindo uquqaba, kubalulekile ukukhumbula ukuthi ifomula esisindo ihlukile ifomula mass, elibukeka kanje:

m = ρ / V,

okungukuthi, kwabantu into ehlukaniswa umthamo yayo.