3 mau nīnau e pili ana i ka hoʻohālikelike ikaika hopena
1. Neʻe aku kahi kaʻa me ke kaumaha o 5 tone mai ka hoʻomaha ʻana i loko o 50 kekona, a hiki i ka wikiwiki o 72 km/hola. ʻO ka ikaika ma luna o ke kaʻa…
ʻIke ʻia:
Nuipaʻa (m) = 5 tons = 5000 kg
Ka wikiwiki mua (vo) = 0
Ka wikiwiki hope loa (vt) = 72 km/h = 20 m/s
Ka manawa (t) = 50 kekona
Makemake ʻia: Ikaika (F)
pāʻoihana:
E helu i ka wikiwiki me ka hoʻohana ʻana i ke ʻano hana o ka Non Uniform Linear Motion:
vt = v o + ma
20 = 0 + a (50)
20 = 50 a
a = 20 / 50 = 0,4 m/s 2
E helu i ka ikaika hopena me ka hoʻohana ʻana i ke ʻano kānāwai ʻelua o Newton:
ΣF = ma
F = (5000)(0,4) = 2000 Newtons
2. He 1 tona ke kaumaha o ke kaʻa, no 4 kekona e piʻi like ana kona wikiwiki mai 10 m/s a i 18 m/s. E hoʻoholo i ka nui o ka ikaika e hoʻolalelale ana i ke kaʻa.
ʻIke ʻia:
ʻO ke kaumaha o ke kaʻa (m) = 1 tona = 1000 kg
Ka manawa (t) = 4 kekona
Ka wikiwiki mua (v o ) = 10 m/s
Ka wikiwiki hope loa (vt ) = 18 m/s
Makemake ʻia: Ikaika (F)
pāʻoihana:
E helu i ka wikiwiki me ka hoʻohana ʻana i ke ʻano hana o ka Non Uniform Linear Motion:
vt = v o + ma
18 = 10 + a (4)
18 – 10 = he (4)
8 = 4 a
a = 8 / 4 = 2 m/s 2
E helu i ka ikaika hopena me ka hoʻohana ʻana i ke ʻano kānāwai ʻelua o Newton:
ΣF = ma
F = (1000)(2) = 2000 Newtons
3. He kū pololei nā vectors ikaika ʻelua kekahi i kekahi e hopena ana i ka hopena o 10 N. Inā ʻo kekahi o nā vectors ikaika he 6 N, e hoʻoholo i ka nui o ka vector ikaika ʻē aʻe.
ʻIke ʻia:
Ka ikaika hopena (F) = 10 N
Ikaika 1 (F 1 ) = 6 N
Makemake ʻia: Hoʻoikaika 2 (F 2 )
pāʻoihana:
F 2 = 10 – 6 = 4 Newton
