Kev sib tsoo tsis sib xws hauv ib qho kev ntsuas - teeb meem thiab kev daws teeb meem

1. Ib lub mos txwv hnyav 30-gram uas txav mus los ntawm 30 m/s sib tsoo nrog ib lub thaiv hnyav 1-kg thaum so. Txheeb xyuas qhov ceev ntawm lub thaiv yog tias lub mos txwv thiab lub thaiv xauv ua ke vim yog qhov kev sib tsoo.

Paub:

Qhov hnyav ntawm lub mos txwv (m ₁ ) = 30 grams = 0.03 kg

Qhov hnyav ntawm lub thaiv (m2 ₎ = 1 kg

Qhov ceev pib ntawm lub mos txwv ( v ₁ ) = 30 m/s

qhov ceev pib ntawm lub block (v ₂ ) = 0 ( block thaum so )

Xav tau : qhov ceev ntawm lub mos txwv thiab thaiv tom qab sib tsoo (v')

Tshuaj:

m ₁ v ₁ + m ₂ v ₂ = (m ₁ + m ₂ ) v'

(0.03)(30) + (1)(0) = (0.03 + 1) v'

0.9 + 0 = 1.03 v'

0.9 = 1,03 v'

v' = 0.9 / 1,03

v' = 0.87 m/s

[irp]

2. Lub pob Billiard A uas hnyav 2 kg txav nrog qhov ceev v _A = 6 ms ⁻¹ tsoo taub hau nrog lub pob B uas hnyav sib npaug. Yog tias qhov kev sib tsoo tsis sib luag, qhov ceev ntawm ob lub pob tom qab kev sib tsoo yog dab tsi.

Paub:

Qhov hnyav A (mA ₎ = 2 kg

Qhov hnyav B (mB ₎ = 2 kg

Qhov ceev pib ntawm lub pob A (v _A ) = -6 m/s

Qhov ceev pib ntawm lub pob B (v _B ) = 4 m/s

Cov cim ntxiv thiab cov cim tsis qhia qhia tias cov khoom txav mus rau qhov sib txawv.

Xav tau : qhov ceev ntawm ob lub pob tom qab kev sib tsoo. (v')

Tshuaj:

m _A v _A + m _B v _B = (m _A ' + m _B ) v'

(2)(-6) + (2)(4) = (2 + 2) v'

-12 + 8 = 4 v'

-4 = 4 v'

v' = -4 / 4

v' = -1 m/s

[irp]

3. m₁ = 3 kg thiab m₂ = 4 kg mus txog ib leeg rau ib leeg hauv kev taw qhia sib txawv nrog kev nrawm ntawm v₁ = 10 m/s thiab v₂ = 12 m/s. Yog tias qhov kev sib tsoo tsis muaj zog kiag li, qhov ceev ntawm ob lub pob tom qab kev sib tsoo yog dab tsi.

Paub:

Qhov hnyav ntawm yam khoom 1 (m1 ₎ = 3 kg

Qhov hnyav ntawm yam khoom 2 (m2 ₎ = 4 kg

Qhov ceev ntawm yam khoom 1 (v ₁ ) = -10 m/s

Qhov ceev ntawm yam khoom 2 (v ₂ ) = 12 m/s

Xav tau : qhov ceev tom qab sib tsoo (v')

Tshuaj:

m ₁ v ₁ + m ₂ v ₂ = (m ₁ ' + m ₂ ) v'

(3)(-10) + (4)(12) = (3 + 4) v'

-30 + 48 = 7 v'

18 = 7 v'

v' = 18 / 7

v' = 2.6 m/s

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1. Cov teeb meem thiab kev daws teeb meem ntawm linear momentum
2. Cov teeb meem thiab kev daws teeb meem ntawm lub zog thiab lub zog txav mus los
3. Kev sib tsoo zoo kawg nkaus hauv ib qho teeb meem thiab kev daws teeb meem
4. Kev sib tsoo tsis sib xws hauv ib qho teeb meem thiab kev daws teeb meem
5. Kev sib tsoo tsis sib xws hauv ib qho teeb meem thiab kev daws teeb meem