Mienzaniso miviri yekushandisa mitemo yaNewton kune mafambiro akakombama (kune kukweshana)
1. Huremu hwebhuroko i2 kg, kumhanyisa nekuda kwegiravhiti = 10 m/s2, chiyero che static ne kinetic friction i0,2 uye 0,1. Chivharo chichiri kufamba here kana kuti chiri kufamba? Kana chivharo chiri kufamba, sarudza (a) simba rinobuda rinokurumidzisa chivharo (b) hukuru uye gwara rekumhanya kwechivharo!
Kukurukurirana
Zvinozivikanwa :
Huremu (m) = 2 kg
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s2
Kukosha kwekukakavadzana kwakasimba = 0,2
Kukosha kwekukakavadzana kwakasimba = 0,1
Kurema kwebhuroko (w) = mg = (2)(10) = 20 Newton
wx = w chivi 30o = (20)(0,5) = 10 Newton
wy = w cos 30o = (20)(0,5√3) = 10√3 MaNewton
Simba rakajairika (N) = wy = 10√3 Newton
Simba rekukweshana risingachinji (f)s) = (0,2)(10√3) = 2√3 MaNewton
Simba rekukweshana kweKinetic (f)k) = (0,1)(10√3) = √3 MaNewton
Akabvunzwa : Bhokisi racho richiri kufamba here kana kuti riri kufamba? Kana uchifamba, sarudza simba rinobuda rinokurumidzisa bhokisi uye kukurumidza kwebhokisi!
Jawab :
Bhokisi racho razorora kana wx < fs, bhuroko rinofamba kana wx > fsNekuti wx = 10 Newton na fs = 2√3 Newtons, saka zvinogumiswa kuti bhokisi rinoenda pasi.
(a) simba rinobuda rinokurumidzisa bhokisi
Kana bhokisi richifamba, simba rekukweshana rinoshanda pabhokisi ndiro simba rekukweshana rekinetic (f).k).
(b) hukuru uye gwara rekumhanya kwebhuroko
Kukura kwekumhanya kwebhuroko iri 4,15 m/s2 uye divi rekumhanya kwebhuroko riri pasi.
2. Huremu hwebhuroko i4 kg, kukurumidza kunokonzerwa negiravhiti i10 m/s2. Ma coefficients e static ne kinetic friction nde 0,4 na 0,2. Kana hukuru hwesimba F huri 40 Newton, bhuroko racho richiri kufamba here kana kuti riri kufamba? Kana bhuroko riri kufamba, sarudza (a) simba rinobuda rinokurumidzisa bhuroko (b) hukuru uye gwara rekumhanya kwebhuroko!
Kukurukurirana
Zvinozivikanwa :
Huremu (m) = 4 kg
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s2
Kukosha kwekukakavadzana kwakasimba = 0,4
Kukosha kwekukakavadzana kwakasimba = 0,2
Kurema kwebhuroko (w) = mg = (4)(10) = 40 Newton
wx = w chivi 30o = (40)(0,5) = 20 Newton
wy = w cos 30o = (40)(0,5√3) = 20√3 MaNewton
Simba rakajairika (N) = wy = 20√3 Newton
Simba rekukweshana risingachinji (f)s) = (0,4)(20√3) = 8√3 MaNewton
Simba rekukweshana kweKinetic (f)k) = (0,2)(20√3) = 4√3 MaNewton
F = 40 Newton
Akabvunzwa : Bhokisi racho richiri kufamba here kana kuti riri kufamba? Kana uchifamba, sarudza simba rinobuda rinokurumidzisa bhokisi uye kukurumidza kwebhokisi!
Jawab :
Bhokisi rinodzika pasi kana F < wx +fsBhokisi rinokwira kumusoro kana F > wx +fs. F = 40 Newton, wx = 20 Newton na fs = 8√3 = 13,6 Newtons, saka zvinogumiswa kuti bhokisi rinokwira kumusoro nekuti F yakakura kupfuura wx +fs.
(a) simba rinobuda rinokurumidzisa bhokisi
Kana bhokisi richifamba, simba rekukweshana rinoshanda pabhokisi ndiro simba rekukweshana rekinetic (f).k).
(b) hukuru uye gwara rekumhanya kwebhuroko
Kukura kwekumhanya kwebhuroko iri 1,6 m/s2 uye divi rekumhanya kwebhuroko riri kumusoro.
[Chirungu : Kufamba kwendege yakakombama nesimba rekukweshana]
