Mphamvu imatanthawuza kuchuluka kwa ntchito yomwe chinthu chimagwira mu nthawi imodzi, ndiko kuti, mphamvu ndi kuchuluka kwa thupi komwe kumafotokoza momwe ntchitoyo imagwirira ntchito. Kuchuluka kwa ntchito kumakhazikika, kufupikitsa nthawi, mphamvu yamphamvu kwambiri. Njira yopezera mphamvu ndi: mphamvu = ntchito / nthawi. Mphamvu imadziwika ndi kuchuluka kwa magwiridwe antchito. Ntchito yochitidwa mu nthawi imodzi imatchedwa mphamvu ndipo imasonyezedwa ndi P.
Akupanga mphamvu
M'kati mwa kufalikira kwa mafunde a phokoso, phokoso likamaperekedwa kumalo omwe poyamba adayima, tinthu tating'onoting'ono timagwedezeka mmbuyo ndi kutsogolo pafupi ndi malo omwe ali ofanana, zomwe zimayambitsa kupanikizika ndi kufalikira kwapakati. Zitha kuganiziridwa kuti mafunde amawu amalola kuti sing'angayo ipeze mphamvu ya kinetic yogwedezeka komanso mphamvu yosinthira mphamvu. Mphamvu yamayimbidwe yomwe sing'angayo amapeza chifukwa cha kusokonezeka kwa mafunde ndi kuchuluka kwa mphamvu ya vibration ya kinetic ndi mphamvu yosinthika yomwe ingatheke.
Monga momwe kufalikira kwa mafunde a phokoso mkatikati kumayendera limodzi ndi kufalikira kwa mphamvu, ngati titenga kachigawo kakang'ono ka voliyumu (dV) m'munda wamawu, lolani voliyumu yoyambirira ya sing'angayo ikhale Vo, kukakamiza kukhala po, ndi kachulukidwe kukhala ρ0. Mphamvu ya kinetic ya gawo la voliyumu (dV) chifukwa cha kugwedezeka kwa mafunde △Ek; △Ek=(ρ0 Vo)u2 /2
△Ek ndi mphamvu ya kinetic, J; u ndi liwiro la tinthu, m/s; ρ0 ndi kachulukidwe wapakatikati, kg/m3; Vo ndi voliyumu yoyambirira, m3.
Mbali yofunika ya ultrasound ndi mphamvu yake. Superwave ili ndi mphamvu zamphamvu kwambiri kuposa mafunde wamba amawu. Ichi ndi chimodzi mwazifukwa zofunika zomwe ultrasound ingagwiritsidwe ntchito kwambiri m'magawo ambiri.
Pamene akupanga mafunde kufika wina sing'anga, mamolekyu a sing'anga kunjenjemera chifukwa cha zochita za akupanga mafunde, ndi kugwedera pafupipafupi ndi chimodzimodzi pafupipafupi akupanga mafunde. Kuchuluka kwa kugwedezeka kwa mamolekyu apakati kumatsimikizira kuthamanga kwa kugwedezeka. Kukwera kwafupipafupi, kumathamanga kwambiri. Kuphatikiza pa kuchuluka kwa molekyulu yapakatikati, mphamvu yomwe imapezedwa ndi kugwedezeka kwa molekyulu yapakatikati imakhalanso yolingana ndi liwiro la kugwedezeka kwa molekyulu yapakatikati. Choncho, apamwamba pafupipafupi akupanga mafunde, ndi apamwamba mphamvu akamagwira sing'anga mamolekyu. Pafupipafupi mafunde akupanga mafunde ndi apamwamba kwambiri kuposa pafupipafupi wamba phokoso mafunde, kotero akupanga mafunde akhoza kupanga sing'anga mamolekyu kupeza mphamvu zambiri, koma zotsatira wamba phokoso mafunde pa sing'anga mafunde ndi ochepa kwambiri. Mwa kuyankhula kwina, ultrasound ili ndi mphamvu zambiri kuposa mafunde a phokoso, ndipo imatha kupereka mphamvu zokwanira ku mamolekyu apakati.
