1. E huli i nā ikaika umekaumaha T1 , T2 , a me T3 . E hoʻowahāwahā i ke kaumaha o ke kaula.
pāʻoihana
(a) Kiʻikuhi kino kūʻokoʻa no ka mea (b) Kiʻikuhi kino kūʻokoʻa no ke kaula
E hoʻopili i ke kānāwai mua o Newton ma luna o ka mea:
ΣF y = 0
T 1 – w = 0
T 1 = w = mg
T 1 = (5 kg)(9.8 m/s 2 )
T 1 = 49 kg m/s 2
T 1 = 49 N
E hoʻopili i ke kānāwai mua o Newton ma ke kaula:
∑ F x = 0
T 3x – T 2x = 0
T 3 cos 30 o – T 2 cos 40 o = 0
0.87 T 3 – 0.77 T 2 = 0
0.87 T 3 = 0.77 T 2
T 2 = 0.87 T 3 / 0.77 = 1.1 T 3 ———- Kaulike 1
ʻAʻole maopopo
-
∑ F y = 0
T 3y + T 2y – T 1y = 0
T 3 hewa 30 o + T 2 hewa 40 o – T 1 = 0
0.5 T 3 + 0.64 T 2 – 49 N = 0 ———- Kaulike 2
Ke pani nei iā T 2 i loko o ka hoohalike 2 i loko o ka hoohalike 2:
0.5 T₂ + 0.64 (1.1 T₂ ) – 49 N = 0
0.5 T 3 + 0.70 T 3 – 49 = 0
1.2 T 3 – 49 = 0
1.2 T 3 = 49
T 3 = 49 / 1.2
T 3 = 41 N
---
T 2 = 1.1 T 3
T 2 = (1.1)(40.8 N)
T 2 = 45 N
[wpdm_package id='488′]
- Nā ʻāpana i ke kaulike hoʻokahi-dimensional
- Nā ʻāpana i ke kaulike ʻelua-dimensional
- Ke kaulike o nā kino i hoʻopili ʻia e nā kaula a me nā pulleys
- Ke kaulike o nā kino ma ka mokulele inclined
