Mafomula eSimba reKusangana kweSimba uye reKinetic
Kukweshana isimba rinoita zvinopesana nekufamba pakati penzvimbo mbiri dziri kusangana. Kune mhando mbiri huru dzekukweshana: kukweshana kwakagadzika uye kukweshana kwekinetic. Dzese dzinotamba mabasa akakosha muzviitiko zvakasiyana-siyana zvemuviri uye mashandisirwo azvo. Chinyorwa chino chichakurukura tsananguro, mafomula, uye mashandisirwo ekukweshana kwakagadzika uye kinetic, pamwe nekupa mienzaniso yekuverenga kujekesa pfungwa idzi.
Kunzwisisa Kukakavadzana
Kukweshana isimba rinopesana nekufamba pakati penzvimbo mbiri dzakabatana. Simba iri rinobva pakudyidzana kwe microscopic pakati penzvimbo dzakaomarara padanho re microscopic. Kune mhando mbiri huru dzekukweshana:
1. Kukweshana Kusingachinji: Simba rinoita basa rekudzivirira kutanga kwekufamba pakati penzvimbo mbiri dziri kusangana. Simba iri rinoita basa kusvika rasvika pamuganho wepamusoro, unonzi simba guru rekukweshana risingachinji.
2. Kinetic Friction: Simba rinoita zvinopesana nekufamba pakati penzvimbo mbiri dziri kutofamba dzichienderana. Simba rekukakavadzana kwekinetic rinowanzova diki pane simba guru rekukakavadzana kwestatic.
Fomura yeSimba reKukweshana Kwakagadzika
Simba rekukweshana rinomira (\(f_s\)) ndiro simba rinofanira kukundwa kuti ritange kufamba pakati penzvimbo mbiri. Simba iri rinoenderana nesimba rakajairika (\(N\)) richishanda pachinhu uye coefficient yekukweshana kunomira (\(\mu_s\)). Fomura yacho ndeiyi:
\[ f_s \leq \mu_s N \]
Di mana:
– \(f_s\) isimba rekukweshana rinomira (Newton, N),
– \(\mu_s\) ndiyo coefficient yekukakavadzana kusina kusimba (haina mayuniti),
– \(N\) isimba rinowanzo shanda pachinhu chacho (Newton, N).
Simba rekukweshana rinomira rinosvika padanho rayo guru kana chinhu chacho chiri panzvimbo yacho chisati chatanga kufamba:
\[ f_s^{\text{max}} = \mu_s N \]
Fomura yeKinetic Friction Force
Simba rekukweshana kwekinetic (\(f_k\)) isimba rinoita zvinopesana nekufamba pakati penzvimbo mbiri dziri kutofamba-famba. Simba iri rinoenderanawo nesimba rakajairika (\(N\)) richishanda pachinhu uye coefficient yekinetic friction (\(\mu_k\)). Fomura yacho ndeiyi:
\[ f_k = \mu_k N \]
Di mana:
– \(f_k\) ndiyo kinetic friction force (Newton, N),
– \(\mu_k\) ndiyo coefficient ye kinetic friction (haina mayuniti),
– \(N\) isimba rinowanzo shanda pachinhu chacho (Newton, N).
Musiyano uripo pakati peStatic neKinetic Friction
1. Hukuru hweSimba: Simba guru rekukweshana rinogara rakakura kupfuura kana kuti rakaenzana nesimba rekukweshana rinoita kuti chinhu chifambe. Izvi zvinoreva kuti simba guru rinodiwa kuti chinhu chitange kufamba kupfuura kuti chinhu chirambe chichifamba.
2. Coefficient of Friction: Coefficient of static friction (\(\mu_s\)) inowanzova yakakura kupfuura coefficient of kinetic friction (\(\mu_k\)). Izvi zvinoratidza kuti zvakaoma kutanga chinhu chichifamba pane kuchengetedza kufamba kwacho.
Kushandiswa kweKukakavadzana muhupenyu hwezuva nezuva
Kukweshana, kwese kuri kwechimiro chemuviri (static) nekwechinyakare (kinetic), kune mashandisirwo akawanda akakosha muhupenyu hwezuva nezuva uye tekinoroji. Heano mimwe mienzaniso:
Mota
Mumotokari, kukweshana pakati pematairi nemugwagwa kwakakosha pakukweshana nekudzora. Kukweshana kwakasimba kunobvumira mota kutanga nekumhanya, ukuwo kukweshana kwakasimba kuchibatsira pakunonotsa nekumisa mota. Masisitimu emabhureki akagadzirwa kuti ashandise kukweshana kwakasimba kumisa mota zvakachengeteka.
Peralatan Rumah Tangga
Kukweshana kwakakoshawo mumidziyo yakawanda yemumba. Semuenzaniso, kana uchishandisa muchina wekukwesha kofi, kukweshana pakati pebhinzi dzekofi nemashizha emuchina wekukwesha kunobvumira kuti bhinzi dziputswe kuita zvidimbu zvidiki. Mumuchina wekuwachisa, kukweshana pakati pembatya nedhiramu kunobatsira kubvisa tsvina kubva pashinda dzejira.
Mitambo
Mumitambo, kukweshana kunoita basa guru mukuita kwemutambi. Mumitambo yakaita senhabvu kana basketball, shangu dzine rabha dzinopa kukweshana kwakakwana kudzivirira kutsvedza. Mumitambo yemotokari, matai akagadzirwa zvakanaka anoshandiswa kuwedzera kukweshana pamusoro penzira, zvichibvumira mota kutenderera nekumhanya kwakanyanya pasina kutsvedza.
Kuvaka uye Maindasitiri
Mukuvaka, kukweshana kunoshandiswa kudzikamisa zvivakwa. Semuenzaniso, chipikiri chakaroverwa muvhu chinoita kuti pave nekukweshana kwakakwana kuti chisaremerwe. Muindasitiri yekugadzira, kukweshana kunoshandiswa mumabasa akadai sekukuya nekucheka simbi.
Muenzaniso weKuverenga Simba reKukweshana
Ngatitarisei mimwe mienzaniso yekuverenga simba rekukweshana mumamiriro akasiyana kuti tijekese kunzwisisa kwedu.
Muenzaniso 1: Kuverenga Simba Rinokakavara Rinomira
Bhokisi rine huremu hwe10 kg rinoiswa panzvimbo yakati sandara. Chiyero chekukakavadzana kwesimba pakati pebhokisi nepamusoro i0.5. Verenga simba guru rekukakavadzana kwesimba rinogona kushanda pabhokisi.
Zvinozivikanwa:
– Huremu (\(m\)) = 10 kg,
– Kukwana kwekukweshana kwakasimba (\(\mu_s\)) = 0.5,
– Kukurumidza kukwira nekuda kwegiravhiti (\(g\)) = 9.8 \(m/s^2\).
Kuverenga simba rakajairika (\(N\)):
\[ N = mg \]
\[ N = 10 \, \text{kg} \times 9.8 \, \text{m/s}^2 \]
\[ N = 98 \, \mashoko{N} \]
Kuverenga simba guru rekukweshana kwesimba (\(f_s^{\text{maks}}\)):
\[ f_s^{\text{max}} = \mu_s N \]
\[ f_s^{\text{max}} = 0.5 \times 98 \, \text{N} \]
\[ f_s^{\text{max}} = 49 \, \text{N} \]
Saka, simba guru rekukweshana rinomira rinogona kushanda pabhokisi i49 N.
Muenzaniso 2: Kuverenga Kinetic Friction Force
Bhokisi rine huremu hwe15 kg rinodhonzwa pamusoro penzvimbo yakati sandara nekumhanya kwakafanana. Chiyero chekukakavadzana kwekinetic pakati pebhokisi nepamusoro i0.3. Verenga simba rekukakavadzana kwekinetic rinoshanda pabhokisi.
Zvinozivikanwa:
– Huremu (\(m\)) = 15 kg,
– Kukweshana kwekinetic (\(\mu_k\)) = 0.3,
– Kukurumidza kukwira nekuda kwegiravhiti (\(g\)) = 9.8 \(m/s^2\).
Kuverenga simba rakajairika (\(N\)):
\[ N = mg \]
\[ N = 15 \, \text{kg} \times 9.8 \, \text{m/s}^2 \]
\[ N = 147 \, \mashoko{N} \]
Kuverenga simba rekukweshana kwekinetic (\(f_k\)):
\[ f_k = \mu_k N \]
\[ f_k = 0.3 \kawa 147 \, \mashoko{N} \]
\[ f_k = 44.1 \, \mashoko{N} \]
Saka, simba rekukweshana kwekinetic rinoshanda pablock i44.1 N.
Mhedziso
Kukweshana, kwese kuri static ne kinetic, ipfungwa huru mufizikisi ine mashandisirwo akawanda anoshanda. Kukweshana kwe static isimba rinodzivisa kutanga kwekufamba pakati penzvimbo mbiri, nepo kukweshana kwe kinetic isimba rinopikisa kufamba pakati penzvimbo dziri kutofamba. Kukweshana kwe static ne kinetic, chinhu chakakosha chinokanganisa hukuru hwekukweshana. Kunzwisisa mafomula ekutanga nepfungwa dzekukweshana kunotibvumira kuongorora zviitiko zvakasiyana-siyana zvemuviri uye kugadzira masisitimu anoshanda uye akachengeteka mumamiriro akasiyana-siyana ezuva nezuva uye tekinoroji.
