Mehlala e 'meli ea ho sebelisa melao ea Newton tsamaisong ea ho jara thapo le pulley
1. Boima ba boloko ba 1 ke 2 kg, boima ba boloko ba 2 ke 3 kg, lebelo le bakoang ke matla a khoheli ke 10 m/s2Fumana (a) boholo le tataiso ea ho potlaka ha sistimi (b) boholo ba matla a khatello thapong!
Puisano
Hoa tsebahala :
Boima ba boloko ba 1 (m1) = 2 kg
Boima ba boloko ba 2 (m2) = 3 kg
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s2
Boima ba boloko 1 (w1) = m1 g = (2)(10) = 20 Newton
Boima ba boloko 2 (w2) = m2 g = (3)(10) = 30 Newton
Jawab :
(a) boholo le tataiso ea ho potlaka ha sistimi
w2 > w1 Ka hona, boloko ba 2 bo theohela tlase, boloko ba 1 bo nyolohela hodimo. Kahoo sistimi e tsamaya ka lehlakoreng le leng la oache. Matla a lebileng lehlakoreng le le leng le motsamao wa sistimi ke w2 le T1, ke ntho e ntle. Matla a fapaneng le motsamao oa sistimi, e leng T2 le w1, ke ntho e mpe.
Matla a kgatello hodima thapo a tshwana karolong e nngwe le e nngwe ya thapo.
Kahoo T1 = T2 = T
w2 – T + T – w1 = (m1 +m2) a
w2 - w1 = (m1 +m2) a
30 – 20 = (2 + 3) a
10 = 5 a
a = 10/5
a = 2 m/s2
Boholo ba ho potlaka ha sistimi ke 2 m/s2.
(b) boholo ba kgatello thapong
Tlhahlobo ea sehlopha sa 2.
Ho na le matla a mabeli a sebetsang ho boloko ba 2. Ea pele, boima ba boloko 2 (w2) e lebisitsoeng tlase, ka lehlakoreng le le leng le motsamao oa boloko ba 2, kahoo e na le letšoao le letle. Ea bobeli, matla a kgatello ya thapo hodima boloko ba 2 (T2) e lebisitsoeng holimo, e fapaneng le moo boloko ba 2 bo tsamayang teng, kahoo e na le letshwao le lebe. Sebedisa molao wa bobedi wa Newton:
Tlhahlobo ea sehlopha sa 1.
Ho na le matla a mabeli a sebetsang ho boloko ba 1. Ea pele, boima ba boloko 1 (w1) e lebisitsoeng tlase, e fapaneng le tataiso ea motsamao oa boloko ba 1, kahoo e na le letšoao le lebe. Ea bobeli, matla a kgatello ya thapo hodima boloko ba 1 (T1) e lebisitsweng hodimo, ka lehlakoreng le le leng le motsamao wa boloko ba 1, kahoo e na le letshwao le letle. Sebedisa molao wa bobedi wa Newton:
Boholo ba matla a kgatello ya thapo = T1 = T2 = T = 24 Newton
2. Boloko ba 1 bo holim'a sebaka se bataletseng, se bataletseng se nang le khohlano. Boima ba boloko ba 1 ke 2 kg, boima ba boloko ba 2 ke 4 kg, 'me lebelo le bakoang ke matla a khoheli ke 10 m/s.2, coefficient ea static le kinetic friction ke 0,4 le 0,3. Na sistimi e phomotse kapa e tsamaea? Haeba sistimi e tsamaea, fumana boholo le tataiso ea ho potlaka ha sistimi!
Puisano
Matla a kgatello (T) a thapo ha a bontshwa hobane, jwalo ka ha ho ne ho balwa pele, matla a kgatello a thapo a qetella a tlositswe ho equation. Haeba e botswa potsong, matla a kgatello a thapo a hloka ho bontshwa, empa haeba e sa botswa potsong, e hlokomolohe feela.
Hoa tsebahala :
E botsitsoe : Na sistimi e eme kapa e a tsamaya? Haeba e tsamaya, fumana boholo le tataiso ya ho potlaka ha sistimi!
Jawab :
Hobane w2 > fs (40 Newton > 8 Newton) ebe sistimi e a tsamaya, moo boloko ba 2 bo tsamayang ka ho otloloha ho ya tlase mme boloko ba 1 bo tsamaya ka ho otloloha ho ya ka ho le letona. Ha sistimi e ntse e tsamaya, matla a kgohlano a sebetsang hodima boloko ba 1 ke matla a kgohlano ya kinetic (f).k). Sebelisa molao oa bobeli oa Newton:
Boholo ba ho potlaka ha sistimi ke 5,7 m/s2
[Senyesemane: 'Mele e hokahaneng ka lithapo le li-pulley - ts'ebeliso ea molao oa Newton oa motsamao]
