Maitiro Ekuyera Simba reKukweshana
Kukweshana ndeimwe yezvinhu zvakajairika zvatinosangana nazvo muhupenyu hwezuva nezuva, kubva kushangu dzinobata pamusoro pemugwagwa, matai emotokari anodzivirira kutsvedza, kusvika pakudzima mavanga epenzura nechirabha. Kunyangwe zvichiita sezviri nyore, kukweshana kunoita basa rakakosha musainzi neinjiniya nekuti kunokanganisa kushanda zvakanaka kwekufamba, kuchengetedzeka, uye mashandiro ezvishandiso zvakasiyana-siyana. Saka, kunzwisisa maitiro ekuyera kukweshana hunyanzvi hwakakosha mufizikisi, kunyanya mukuchinja-chinja.
1. Nzwisisa Pfungwa Yekutanga yeSimba Rekukweshana
Kazhinji, kukweshana isimba rinoitika kana nzvimbo mbiri dzakabatana dzofamba (kana kuti dzichifamba) kana dzakabatana. Kutungamira kwesimba rekukweshana kunogara kuchipesana nekutungamira kwekufamba kana kuti maitiro echinhu chekufamba.
Kune mhando mbiri huru dzemasimba ekukakavadzana:
1. Simba rekukweshana risingachinji (fs): rinoitika kana chinhu chisati chafamba, asi simba riri kuedza kuchifambisa. Hukuru hwacho hunogadziriswa kusvika chasvika pahuwandu hwakanyanya.
2. Kinetic friction force (fk): inoitika kana chinhu chatove kufamba. Kukosha kwayo kwakafanana zvakanyanya kupfuura static friction.
Mafomula akajairika anowanzoshandiswa:
– Simba guru rekukweshana rinogara riripo:
\[
f_{s \,max} = \mu_s \, N
\]
– Kinetic friction force:
\[
f_k = \mu_k \, N
\]
Information:
– \( \mu_s \) = coefficient yekukweshana kwakasimba
– \( \mu_k \) = coefficient ye kinetic friction
– \( N \) = simba rakajairika (simba rekumanikidzwa pamusoro pechinhu)
Kuyera simba rekukweshana zvinoreva kuti tinosarudza kukosha kwesimba rinoshanda nekuyedza, kazhinji nekushandisa chimbo chekuyera simba kana nekuongorora mafambiro.
2. Zvishandiso Nezvinhu Zvekuyera Simba Rekukweshana
Pakuedza kuri nyore kuchikoro kana kumba, zvishandiso zvinodiwa zviri nyore kuwana:
– Dynamometer (chiyero chechirimo): chishandiso chekuyera simba muNewtons (N)
– Zvinhu zvinofanirwa kuyedzwa: semuenzaniso matombo emapuranga, machira emurabha, mabhokisi madiki
- Nzvimbo dzekuyedza: matafura emapuranga, girazi, pasi peceramic, sandpaper, bepa
– Tambo kana chirauro: kudhonza zvinhu
- Chikero chehukuru (sarudzo): kuti uwane huremu hwechinhu
- Protractor uye inclinated plane (kana uchishandisa nzira ye inclinated plane)
Nekushandisa chishandiso ichi chiri nyore, tinogona kuyera simba guru rekukweshana rinomira pamwe chete nesimba rekukweshana rinoita kuti zvinhu zviwedzere.
3. Nzira 1: Kuyera Simba reKukweshana neDynamometer (Nzira yekudhonza yakatambanudzwa)
Nzira yakatwasuka ndeyekudhonza chinhu ichi panzvimbo yakati sandara uchishandisa dynamometer.
A. Kuyera Simba Repamusoro Rinokakavara
Kurongeka:
1. Isa chinhu (semuenzaniso bhuroko rehuni) panzvimbo yakati sandara.
2. Batanidza tambo yakatenderedza chinhu chacho woibatanidza nedhinamometer.
3. Dhonza zvishoma nezvishoma wowedzera simba rekudhonza zvishoma nezvishoma.
4. Tarisa kuverenga kuri pa dynamometer. Chero bedzi chinhu chisiri kufamba, simba rekukweshana rinomira richaenzana nesimba rekukweshana.
5. Nyora kukosha kwesimba kana chinhu chatanga kufamba. Kukosha uku ndiko simba guru rekukweshana rinogara (\( f_{s \,max} \)).
Zvakakosha: kubvisa nekukurumidza kunogona kukonzera kuti kuverenga kuwedzere uye kusanyatsojeka. Kubvisa kunofanira kunge kwakadzikama.
B. Kuyera Kinetic Friction Force
Kurongeka:
1. Kana chinhu chave kufamba, chengetedza kudhonza kuitira kuti chinhu chifambe nekumhanya kwakafanana.
2. Kana kumhanya kwacho kuri kusingachinji, simba rinobuda rinosvika pazero, zvichireva kuti simba rekudhonza rakafanana nesimba rekukweshana kwekinetic.
3. Cherechedza nhamba inoverengwa zvakanaka pa dynamometer panguva yekufamba kwacho nguva dzose. Ndiko \( f_k \).
Kazhinji, \( f_k \) idiki pane \( f_{s \,max} \). Ndosaka zvichinyanya kuoma kuti zvinhu "zvitange kufamba" pane "kuramba zvichifamba".
4. Kuverenga Coefficient yeFriction kubva paZviyero
Kana simba rakajairika \( N \) richizivikanwa, tinogona kuverenga coefficient yekukweshana.
Panzvimbo yakati sandara:
\[
N = mg
\]
ne:
– \( m \) = huremu hwechinhu (kg)
– \( g \) = kukurumidza kunokonzerwa negiravhiti (≈ 9,8 m/s² kana 10 m/s² yekufungidzira)
Kana tawana \( f_{s \,max} \), saka:
\[
\mu_s = \frac{f_{s \,max}}{N}
\]
Kana \( f_k \) yawanikwa, saka:
\[
\mu_k = \frac{f_k}{N}
\]
Muenzaniso mupfupi
Semuenzaniso, bhokisi rine huremu hwe2 kg rinodhonzwa patafura.
Simba rinotanga kufamba rinoverenga 6 N, uye kana richifamba nguva dzose rinoverenga 4 N.
Saka:
– \( N = mg = 2 \kawa 10 = 20 \) N
– \( \mu_s = 6/20 = 0,3 \)
– \( \mu_k = 4/20 = 0,2 \)
Mhedzisiro iyi ine musoro nekuti coefficient ye kinetic friction inowanzova diki.
5. Nzira yechipiri: Kuyera Simba reKukweshana neNdege Yakatsamira
Nzira ye "inclined plane" inowanzo shandiswa kana pasina dynamometer kana seimwe nzira.
Nheyo yacho
Tinowedzera kona yekutsvedza kwebhodhi kusvika chinhu chatanga kutsvedza. Panguva iyoyo, chikamu chesimba rehuremu chakaenzana nendege chakaenzana nesimba guru rekukweshana rinomira.
Kana kona yakakosha iri \( \theta \), saka:
\[
\mu_s = \tan(\theta)
\]
Izvi zvinoshanda kune mamiriro ezvinhu apo chinhu chinongotanga kufamba panzvimbo yakatsamira pasina simba rekuwedzera.
Kurongeka:
1. Isa chinhu chacho pabhodhi.
2. Simudza bhodhi zvishoma nezvishoma kuitira kuti kona iwedzere zvishoma nezvishoma.
3. Tarisa kona iyo chinhu chinotanga kufamba nayo.
4. Yera kona uchishandisa protractor kana angle measurement application.
5. Verenga \( \mu_s \) uchishandisa \( \tan(\theta) \).
Kana uchida kinetic friction, unogona kuisa kona chaiyo uye kuyera kukurumidza kwechinhu chacho pachinotsvedza, wobva waongorora masimba ari kushanda. Zvisinei, nzira iyi yakaoma zvishoma uye inowanzoda kuyera nguva/daro.
6. Zvinhu Zvinokanganisa Mhedzisiro Yekuyera
Kuyera simba rekukweshana hakugaro buritsa kukosha kwakafanana, nekuti kunokonzerwa nezvinhu zvakawanda, zvinosanganisira:
– Kuomarara kwenzvimbo: nzvimbo dzisina kusimba dzinowanzo wedzera kukweshana.
– Kuchena kwenzvimbo: guruva, mafuta, kana mvura zvinogona kuchinja kukosha kwekukweshana.
- Nzvimbo yekubata: mumhando dzakanaka dzefizikisi, nzvimbo yekubata haikanganisi zvakananga kukweshana, asi muzvinhu chaizvo inogona kukanganiswa nekuda kwekushanduka.
– Kumhanya kwekufamba: mune zvimwe zvinhu, kukweshana kunogona kuchinja nekuchinja kwekumhanya.
– Tembiricha nehunyoro: kunyanya kune rabha kana zvinhu zvinochinja hunhu zviri nyore.
– Maitiro ekudhonza: kana kudhonza kusina kuenzana nepamusoro (kwakasimudzwa zvishoma), simba rakajairika rinoshanduka zvekuti kukweshana kunochinjawo.
Saka, kuti uwane mhedzisiro chaiyo, ita bvunzo iyi kakawanda uye tora avhareji.
7. Mazano Ekuti Zviyero Zvinyatsojeka
Mazano anoshanda:
1. Dhonza chinhu zvishoma nezvishoma uchiyera kukweshana kwakanyanya kusingachinji.
2. Ita shuwa kuti kudhonza kwacho kwakaenzana nepamusoro kuitira kuti \( N \) kusachinje.
3. Tora zviyero zvakadzokororwa kanenge katatu.
4. Cherechedza mamiriro epamusoro (akaoma, ane guruva, anotsvedza) kuitira kuti data rikwanise kuenzaniswa.
5. Shandisa chinhu chakasimba uye chisingatsvedzereki nyore kuitira kuti simba riverengeke nemazvo.
Penutup
Kuyera kukweshana kunogona kuitwa nenzira iri nyore asi yesainzi. Nzira inonyanya kushandiswa ndeyekushandisa dynamometer kuyera simba kana chinhu chatanga kufamba (maximum static friction) uye kana chichifamba nekumhanya kwakasimba (kinetic friction). Imwe nzira inoshandiswa inzira ye "inclinated plane", iyo inoshandisa "critical angle" kuona coefficient of static friction. Kubva pakuyera, tinogonawo kuverenga coefficient of friction uye kunzwisisa kuti mamiriro epamusoro anokanganisa sei hukuru hwekukweshana.
Nekunzwisisa maitiro ekuyera kukweshana, hatingodzidzi pfungwa yefizikisi chete asiwo tinonzwisisa chiitiko chakakosha chinosarudza kuchengetedzeka, kushanda zvakanaka, uye nyaradzo mumabasa akasiyana-siyana ezuva nezuva uye muinjiniya. Kana muchida, ndinogona zvakare kuwedzera tafura yedata rekuyedza, fomati yemushumo werabhoritari, kana mibvunzo yekudzidzira ine chekuita nekukweshana.
