7 mau laʻana o nā nīnau neʻe laina like
1. Neʻe kekahi mokokaikala ma kahi laina pololei ma ka wikiwiki mau o 10 m/s. E hoʻoholo i ka mamao i hele ʻia e ka mokokaikala ma hope o 10 kekona a me 60 kekona.
Pahana
ʻO ka wikiwiki mau = 10 m/s a i ʻole 10 mika i kekona, ʻo ia hoʻi ka neʻe ʻana o ka mokokaikala i 10 mika i kēlā me kēia 1 kekona.
Ma hope o 2 kekona, neʻe ka mokokaikala i 20 mika,
Ma hope o 5 kekona, neʻe ka mokokaikala i 50 mika,
Ma hope o 10 kekona, neʻe ka mokokaikala i 100 mika.,
Ma hope o 60 kekona, neʻe ka mokokaikala i 600 mika..
2. Neʻe kekahi kaʻa ma kahi laina pololei ma ka wikiwiki mau o 72 km/h. E hoʻoholo i ka mamao o ka hele ʻana o ke kaʻa ma hope o ka neʻe ʻana no 2 mau minuke a me 5 mau minuke.
Pahana
72 km/h = (72)(1000 mika) / 3600 kekona = 72000 / 3600 kekona = 20 mika/kekona.
ʻO ka wikiwiki mau o 20 mika/kekona, ʻo ia hoʻi, neʻe ke kaʻa i 20 mika i kēlā me kēia 1 kekona.
Ma hope o 120 kekona a i ʻole 2 mau minuke, neʻe ka mokokaikala i kahi mamao o (20)(120) = 2400 mika,
Ma hope o 300 kekona a i ʻole 5 mau minuke, neʻe ka mokokaikala i kahi mamao o (20)(300) = 6000 mika.
3. Neʻe kekahi mea ma kahi laina pololei he 100 mika i kēlā me kēia 50 kekona. E hoʻoholo i ka wikiwiki o ka mea!
Pahana
100 mika / 50 kekona = 10 mika / 5 kekona = 2 mika/kekona.
4. ʻO ka wikiwiki o ka neʻe ʻana o ka mea ma muli o ka pakuhi ma lalo nei….
Pahana
Māmā = mamao / manawa
Ka wikiwiki = 2 mika / 1 kekona = 4 mika / 2 kekona = 6 mika / 3 kekona = 8 mika / 4 kekona = 2 mika/kekona.
5. Ke neʻe nei nā kaʻa A a me B kekahi i kekahi me ka wikiwiki mau ma ke ala pololei. Ke 100 mika ka mamao ma waena o nā kaʻa ʻelua, ke neʻe nei ke kaʻa A me ka wikiwiki mau o 10 m/s, ke neʻe nei ke kaʻa B me ka wikiwiki mau o 40 m/s. E hoʻoholo (a) ka mamao i hele ʻia e ke kaʻa A ma mua pono o ka hala ʻana o ke kaʻa B (b) ka manawa i hele ʻia e ke kaʻa B ma mua o ka hala ʻana o ke kaʻa A.
Pahana
Neʻe ke kaʻa A i ka wikiwiki mau o 10 mika/kekona, ʻo ia hoʻi, neʻe ke kaʻa A i 10 mika i kēlā me kēia 1 kekona. Ma hope o 2 kekona, neʻe ke kaʻa A i kahi mamao 20 mika.
Neʻe ke kaʻa B i ka wikiwiki mau o 40 mika/kekona, ʻo ia hoʻi, neʻe ke kaʻa A i 40 mika i kēlā me kēia 1 kekona. Ma hope o 2 kekona, neʻe ke kaʻa B i kahi mamao 80 mika.
20 mika + 80 mika = 100 mika.
(a) ʻO ka mamao i hele ʻia e ke kaʻa A ma mua o ka hala ʻana o ke kaʻa B ʻo ia 20 mikaʻO ka mamao i hele ʻia e ke kaʻa B ma mua o ka hala ʻana o ke kaʻa A 80 mika.
(b) ʻO ka manawa no ke kaʻa B e holo ai ma mua o ka hala ʻana o ke kaʻa A ʻo ia 2 kekonaʻO ka manawa ma waena o ke kaʻa A a me ke kaʻa B 2 kekona
6. Aia ma ka papa ma lalo nei ka mamao a me ka manawa huakaʻi o kahi mea!
Ua hana kekahi haumāna i kahi hoʻokolohua ma ka neʻe ʻana o ʻelua mau mea ʻekolu manawa, e like me ka mea i hōʻike ʻia ma ka papa ma luna. ʻO ke ʻano o ka neʻe ʻana i hana ʻia ma nā mea 1 a me 2, kēlā me kēia, ʻo ia...
A. Ua lohi ʻia ʻo GLB a me GLBB
B. Hoʻolalelale ʻia ʻo GLB a me GLBB
C. Hoʻolalelale ʻia ʻo GLBB a me GLB
D. Hoʻēmi ʻia ka wikiwiki o GLBB a me GLB
Pahana
Mea 1:
v = s / t
Wehewehe: v = wikiwiki, s = mamao, t = manawa
v = 60/15 = 4 kenimika/s
v = 80/20 = 4 kenimika/s
v = 100/25 = 4 kenimika/s
Ka wikiwiki o ka mea mau = ka neʻe laina like (GLB).
Mea 2:
v = s / t
Wehewehe: v = wikiwiki, s = mamao, t = manawa
v = 4/2 = 2 kenimika/s
v = 9/3 = 3 kenimika/s
v = 25/5 = 5 kenimika/s
Piʻi ka wikiwiki o ka mea = ka neʻe laina hoʻolalelale like i hoʻolalelale ʻia (GLBB).
ʻO ka pane pololei ʻo B.
7. Ke alualu nei kekahi mea hahai holoholona i loko o kāna kaʻa i kahi dia. Ke holo nei ke kaʻa ma ka wikiwiki o 72 km/h a ke holo nei ka dia ma ka wikiwiki o 64,8 km/h. Ke 202 m ka mamao ma waena o ke kaʻa a me ka dia, kī ka mea hahai holoholona i kāna pū. Puka ka pōkā mai ka pū raifela ma ka wikiwiki o 200 m/s e kūʻē i ka pū raifela. Paʻi ka pōkā i ka dia ma hope o kekahi manawa o….
- 0,5 kekona
- 1 kekona
- 1,25 kekona
- 1,5 kekona
Pahana
Ua ʻike ʻia:
Ka wikiwiki o ke kaʻa (v)b) = 72 km/h = (72)(1000 m) / 3600 s = 20 m/s
Ka wikiwiki o ka dia (v)r) = 64,8 km/h = (64,8)(1000 m) / 3600 s = 64800 m / 3600 s = 18 m/s
Ke kī ʻia ka pū, ʻo ka mamao ma waena o ke kaʻa a me nā dia = 202 mika
Ka wikiwiki o ka pōkā (v)p) = 20 m/s + 200 m/s = 220 m/s
Ua paʻa ka pū e kahi mea hahai holoholona i loko o kahi kaʻa e neʻe ana i ka wikiwiki o 20 m/s i hoʻohui ʻia ai ka wikiwiki o ka pōkā i ka wikiwiki o ke kaʻa.
Ua nīnau ʻia: Ua pā ka pōkā i ka dia ma hope o ka hala ʻana o ka manawa….
Pane:
Manaʻo ʻia e neʻe ana ke kaʻa a me ka dia ma kahi laina pololei ma ka wikiwiki mau.
ʻO ke ʻano wikiwiki: v = s / t a i ʻole s = vt
Ka wehewehe ʻana i ke ʻano hana: v = wikiwiki, s = mamao, t = manawa
Ka mamao i hele ʻia e ka dia = 202 + Xr = 202 + vr t = 202 + 18 t
Ka mamao o ka pōkā = Yp = vp t = 220 t
Ke pā ka pōkā i ka dia, ʻo ka mamao i hele ʻia e ka pōkā = ka mamao i hele ʻia e ka dia.
Ka mamao o ka hele ʻana o ka dia = Ka mamao o ka hele ʻana o ka pōkā
202 + 18 t = 220 t
202 = 220 t – 18 t
202 = 202 t
t = 202/202
t = 1 kekona
ʻO ka pane pololei ʻo B.
Nā nīnau neʻe pololei like
1. Neʻe kekahi mokokaikala ma kahi laina pololei ma ka wikiwiki mau o 12 m/s. E hoʻoholo i ka mamao i hele ʻia e ka mokokaikala ma hope o 4 kekona a me 7 kekona.
2. Neʻe kekahi kaʻa ma kahi laina pololei ma ka wikiwiki mau o 36 km/h. E hoʻoholo i ka mamao o ka hele ʻana o ke kaʻa ma hope o ka neʻe ʻana no 3 mau minuke a me 8 mau minuke.
3. Neʻe kekahi mea ma kahi laina pololei he 200 mika i kēlā me kēia 50 kekona. E hoʻoholo i ka wikiwiki o ka mea!
4. ʻO ka wikiwiki o ka neʻe ʻana o ka mea ma muli o ka pakuhi ma lalo nei….
5. Ke neʻe nei nā kaʻa A a me B kekahi i kekahi me ka wikiwiki mau ma ke ala pololei. Ke 120 mika ka mamao ma waena o nā kaʻa ʻelua, ke neʻe nei ke kaʻa A me ka wikiwiki mau o 20 m/s, ke neʻe nei ke kaʻa B me ka wikiwiki mau o 40 m/s. E hoʻoholo (a) ka mamao i hele ʻia e ke kaʻa A ma mua pono o ka hala ʻana o ke kaʻa B (b) ka manawa i hele ʻia e ke kaʻa B ma mua o ka hala ʻana o ke kaʻa A.
[Pelekania: Ka wikiwiki mau - nā pilikia a me nā hoʻonā ]
