Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana ma nā ʻili piʻo - nā pilikia a me nā hoʻonā

1. Heʻe iho kahi poloka 1-kg ma luna o ka ʻili laumania a ʻōniʻoniʻo. E hoʻoholo i ka ikehu kinetic a me ka wikiwiki o ka poloka ma ka ʻili haʻahaʻa loa. ʻO ka wikiwiki ma muli o ke koʻikoʻi he 10 m/s ².

ʻIke ʻia:

Nuipaʻa (m) = 1 kg

ʻO ka loli o ke kiʻekiʻe (h) = 5 m

Ka wikiwiki ma muli o ke koʻikoʻi (g) = 10 m/s ²

Makemake ʻia: Ikehu kinetic (KE) a me ka wikiwiki o ka poloka.

Lōlā:

(a) Ikehu kinetic

ʻO ka ikehu mechanical mua = ka ikehu hiki ke hoʻopaʻa ʻia

ME _o = PE = mgh = (1)(10)(5) = 50 Joules

ʻO ka ikehu mechanical hope loa = ikehu kinetic

ME _t = KE = ½ mv _t ²

ʻŌlelo ke kumumanaʻo o ka mālama ʻana i ka ikehu mechanical ʻo ka ikehu mechanical mua = ka ikehu mechanical hope loa:

ʻO wau _o = ʻO wau _t

PE = KE

50 = KE

Ikehu kinetic (KE) = 50 Joules.

(b) Ka wikiwiki o ka poloka

ʻO ke kumumanaʻo o ka mālama ʻana i ka ikehu mechanical:

ʻO ka ikehu mechanical mua (ME _o ) = ka ikehu mechanical hope loa (ME _t )

ʻO ka ikehu hiki ke hoʻopaʻa ʻia e ka umekaumaha (PE) = ikehu kinetic (KE)

50 = ½ mv ²

2(50) / m = v ²

100 / 1 = v ²

100 = v ²

v = √100

v = 10 m/s

ʻAʻole maopopo

2. Heheʻe iho kahi mea 2-kg me ka ʻole o ka friction. He aha ka ikehu kinetic a me ka wikiwiki o ka mea ma 2 mika ma luna o ka honua. ʻO ka wikiwiki ma muli o ke umekaumaha he 10 m/s ²

ʻIke ʻia:

Nuipaʻa (m) = 2 kg

ʻO ka loli o ke kiʻekiʻe (h) = 10 – 2 = 8 m

Ka wikiwiki ma muli o ke koʻikoʻi (g) = 10 m/s ²

Makemake ʻia : ikehu kinetic (KE) a me ka wikiwiki (v) ma 2 mika ma luna o ka honua.

Lōlā:

(a) Ikehu kinetic ma 2 mika ma luna o ka honua

ʻO ka ikehu mechanical mua = ka ikehu hiki ke hoʻopaʻa ʻia

ME _o = PE = mgh = (2)(10)(8) = 160 Joules

ʻO ka ikehu mechanical hope loa = ikehu kinetic

ME _t = KE = ½ mv _t ²

ʻO ke kumumanaʻo o ka mālama ʻana i ka ikehu mechanical e ʻōlelo ana ʻo ka ikehu mechanical mua = ka ikehu mechanical hope loa:

ʻO wau _o = ʻO wau _t

PE = KE

160 = KE

ʻO ka ikehu kinetic (KE) ma 2 mika ma luna o ka honua he 160 Joules.

(b) Ka wikiwiki o ka mea ma ka ʻili haʻahaʻa loa

Kumumanaʻo o ka mālama ʻana i ka ikehu mechanical:

ʻO ka ikehu mechanical mua (ME₂o ₎ = ka ikehu mechanical hope loa ( _EM₂t )

ʻO ka ikehu hiki ke hoʻopaʻa ʻia e ka umekaumaha (PE) = ikehu kinetic (KE)

160 = ½ mv ²

160 = ½ (2) v ²

160 = v ²

v = √160 = √(16)(10) = 4√10 m/s

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1. Nā pilikia hana i hana ʻia e ka ikaika a me nā hoʻonā
2. Nā pilikia a me nā hoʻonā o ka ikehu hana-kinetic
3. Nā pilikia a me nā hoʻonā i nā kumumanaʻo ikehu hana-mekanika
4. Nā pilikia ikehu hiki ke umekaumaha a me nā hoʻonā
5. Ka ikehu hiki ke loaʻa o nā pilikia a me nā hoʻonā o ka pūnāwai elastic
6. Nā pilikia mana a me nā hoʻonā
7. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe hāʻule manuahi
8. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana i luna a i lalo i ka neʻe hāʻule manuahi
9. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana ma luna o kahi ʻili kūlou
10. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana ma ka mokulele inclined
11. Ka hoʻohana ʻana i ka mālama ʻana i ka ikehu mechanical no ka neʻe ʻana o ka projectile