Cov Lus Nug Piv Txwv Txog Kev Tawm Tsam Caij Nplooj Ntoos Zeeg Dawb

16 Piv txwv ntawm Cov Lus Nug Txog Kev Tawm Tsam Dawb Lub Caij Nplooj Ntoos Zeeg.

1. Cov txiv maj phaub tawg ntawm cov qia thiab tuaj txog rau hauv av tom qab peb vib nas this. Thaum nws poob rau hauv av, qhov ceev ntawm cov txiv maj phaub yog dab tsi? g = 10 m/s²
Kev Sib Tham
Nws yog paub :
t = 3 vib nas this
g = 10 m/s²
Nug :
Qhov ceev kawg (v_t)?
Jawb :
Tsis muaj mis.
Thaum poob dawb, cov txiv hmab txiv ntoo muaj kev nrawm nrawm ntawm 10 m / s² los yog 10 m/s ib ob. Qhov no txhais tau tias qhov ceev ntawm cov txiv hmab nce ntxiv 10 m/s txhua ob.
Tom qab 1 vib nas this, qhov ceev ntawm cov txiv hmab txiv ntoo = 10 m/s
Tom qab 2 vib nas this, qhov ceev ntawm cov txiv hmab txiv ntoo = 20 m/s
Tom qab 3 vib nas this, qhov ceev ntawm cov txiv hmab txiv ntoo = 30 m/s.
Siv cov mis.
GLBB Formula :
v_t = v_o + gt
h = v_o t + ½ gt²
v_t² = v_o² + 2 gh
Thaum lub caij poob dawb, lub khoom tsis muaj qhov ceev pib (v)_o = 0). Yog li ntawd, cov mis saum toj no hloov mus rau:
Cov Qauv GJB :
v_t = gt
h = ½ gt²
v_t² = 2 gh
Kev piav qhia: v_t = qhov ceev kawg, g = kev nrawm vim yog lub ntiajteb txawj nqus, t = lub sijhawm luv, h = qhov siab.
Muab g thiab t, nug v_t yog li ntawd siv thawj daim qauv.
v_t = gt
v_t = (10)(3)
v_t = 30 m/s
Qhov ceev kawg ntawm cov txiv hmab txiv ntoo = 30 m/s

2. Ib yam khoom poob dawb paug los ntawm qhov siab ntawm 5 meters saum av. Txheeb xyuas (a) qhov ceev ntawm txiv maj phaub thaum nws ntaus hauv av (b) Lub sijhawm rau cov txiv hmab txiv ntoo poob kom txog thaum nws mus txog hauv av.
g = 10 m/s²
Kev Sib Tham
Nws yog paub :
h = 5 meters
g = 10 m/s²
Nug :
(a) Qhov ceev kawg (v_t)?
(b) Lub sijhawm luv (t)?
Jawb :
Cov Qauv GJB :
v_t = gt
h = ½ gt²
v_t² = 2 gh
(a) Qhov ceev kawg (v_t)
Muab h thiab g, nug v_t yog li ntawd siv tus qauv thib peb.
v_t² = 2 gh = 2(10)(5) = 100
v_t = 10 m/s
(b) Lub sijhawm luv (t)
Muab h thiab g, kom nrhiav tau t, siv cov mis thib ob.
h = ½ gt²
5 = ½ (10) t²
5 = 5 t²
t² = 5/5 = 1
t = 1 vib nas this
Lub sijhawm sib nrug = 1 vib nas this

3. Ib lub pob raug poob ntawm qhov siab. Txheeb xyuas (a) qhov kev nrawm ntawm cov khoom (b) qhov kev ncua deb uas tau mus txog hauv 3 vib nas this (c) lub sijhawm rau cov khoom kom ncav cuag qhov ceev ntawm 20 m / s
g = 10 m/s²
Kev Sib Tham
Nws yog paub :
g = 10 m/s²
Nug :
(a) Kev nrawm dua (a)?
(b) Qhov deb uas tau mus (h) yog tias t = 3 vib nas this?
(c) Lub sijhawm luv (t) yog tias v_t = 20 m/s
Jawb :
Cov Qauv GJB
v_t = gt
h = ½ gt²
v_t² = 2 gh
(a) Kev nrawm dua (a)?
Kev nrawm ntawm yam khoom = kev nrawm vim lub ntiajteb txawj nqus = 10 m/s²Qhov no txhais tau tias qhov ceev ntawm yam khoom nce ntxiv 10 m/s ib 1 vib nas this.
(b) Qhov deb uas tau mus (h) yog tias t = 3 vib nas this?
Muab g = 10 thiab t = 3, kom nrhiav h, siv cov mis thib ob.
h = ½ gt² = ½ (10)(3) = (5)(3)²) = (5)(9) = 45 meters
(c) Lub sijhawm luv (t) yog tias v_t = 20 m/s
Muab g = 10 thiab v_t = 20, nug t yog li ntawd siv thawj tus qauv.
v_t = gt
20 = (10) t
t = 20 / 10 = 2 vib nas this

4. Muaj ib lub pob zeb poob los ntawm saum lub pej thuam siab 80 meters. Yog tias qhov kev nrawm vim lub ntiajteb txawj nqus yog 10 m/s², qhov ceev ntawm lub pob zeb thaum nws ntaus hauv av yog ...
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
E. 50 m/s
Kev Sib Tham
Nws paub tias:
h = 80 meters
g = 10 m/s²
Nug:
Qhov ceev kawg (v_t) pob zeb?
Lus teb:

Cov lus teb yog D.

5. Ib yam khoom raug poob ntawm lub tsev ntau txheej yam tsis muaj qhov pib ceev. Tom qab ob vib nas this, yam khoom ntawd mus txog hauv av (g = 10 m/s²). Qhov siab uas ib yam khoom poob rau yog...
A. 10 meters
B. 20 meters
C. 30 meters
D. 40 meters
E. 50 meters
Kev Sib Tham
Nws paub tias:
t = 2 vib nas this
g = 10 m/s²
Nug:
Qhov siab (h)?
Lus teb:

Cov lus teb yog B.

6. Ib lub pob raug poob ntawm qhov siab X raws li pom hauv daim duab hauv qab no. Yog tias qhov siab ntawm lub pob thaum lub sijhawm dhia thawj zaug yog 50 cm thiab qhov dhia zaum ob yog 20 cm, ces qhov loj ntawm x yog….
A. 60 cm
B. 70 cm
C. 100 cm
D. 125 cm
E. 150 cm
Kev Sib Tham

Cov lus teb yog D.

7. Saib daim duab hauv qab no! Thaum xub thawj lub pob raug tso tawm ntawm qhov chaw (1) thiab tom qab kov hauv pem teb, lub pob dhia. Yog tias g = 10 ms^-2, ces qhov siab h yog….
A. 74 cm
B. 70 cm
C. 66 cm
D. 64 cm
E. 60 cm
Kev Sib Tham

Cov lus teb yog D.

8. Muaj ib lub pob zeb poob los ntawm saum lub pej thuam siab 45 m. Yog tias qhov kev nrawm vim lub ntiajteb txawj nqus yog 10 m/s ^-2 , qhov ceev ntawm lub pob zeb thaum nws tsoo hauv av yog...

A. 25 ms^-1
B. 30 ms^-1
C. 35 ms^-1
D. 40 ms^-1
E. 45 ms^-1

Kev Sib Tham
Nws yog paub :
Qhov siab (h) = 45 meters
Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s²
Nug : Qhov ceev ntawm lub pob zeb thaum nws ntaus hauv av (v)_t)
Jawb :
Cov mis kev txav mus los dawb :
v_t² = 2 gh
Qhov ceev ntawm lub pob zeb thaum nws ntaus hauv av :
v_t² = 2 (10)(45) = 900
v_t = √900 = 30 m/s²
Cov lus teb yog B.

9. Ib yam khoom poob ntawm lub pej thuam tsis muaj qhov pib ceev. Tom qab 2 vib nas this, yam khoom ntawd mus txog hauv av. Yog tias g = 10 ms ^-2 , ces qhov siab ntawm lub pej thuam yog...

A. 40 m
B. 25 m
C. 20 m
D. 10 m
E. 5 m

Kev Sib Tham
Nws yog paub :
Lub sijhawm luv (t) = 2 vib nas this
Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s²
Nug Qhov siab ntawm lub pej thuam (h)

Jawb :
Cov mis ntawm kev txav mus los ntawm kev poob dawb :
h = ½ gt²
Qhov siab ntawm lub pej thuam :
h = ½ (10)(2)² = (5)(4) = 20 meters
Cov lus teb yog C.

10. Ib yam khoom hnyav 2 kg poob dawb paug ntawm qhov siab 20 m saum av. Nws siv sijhawm ntev npaum li cas rau yam khoom ntawd kom txog hauv av? (g = 10 ms)^-2)
A. 20 vib nas this
B. 18 vib nas this
C. 10 vib nas this
D. 5 vib nas this
E. 2 vib nas this
Kev Sib Tham
Qhov hnyav ntawm ib yam khoom tsis raug coj los xav txog thaum daws cov teeb meem kev poob dawb.
Nws yog paub :
Qhov siab (h) = 20 meters
Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s²
Nug Lub sijhawm uas lub khoom mus txog hauv av (t)
Jawb :
Cov mis ntawm kev txav mus los ntawm kev poob dawb :
h = ½ gt²
Lub sijhawm uas ib yam khoom mus txog hauv av :
20 = ½ (10)(t)²)
20= (5)(t²)
20/5 = t²
4 = t²
t = √4
t = 2 vib nas this
Cov lus teb yog yog E.

11. Muaj ib lub pob zeb poob los ntawm saum lub pej thuam siab 45 m. Yog tias qhov kev nrawm vim lub ntiajteb txawj nqus yog 10 m/s^-2, qhov ceev ntawm lub pob zeb thaum nws ntaus hauv av yog ...
A. 25 ms^-1
B. 30 ms^-1
C. 35 ms^-1
D. 40 ms^-1
E. 45 ms^-1
Kev Sib Tham

12. Ib yam khoom poob ntawm lub pej thuam yam tsis muaj qhov pib ceev, tom qab 2 vib nas this yam khoom ntawd mus txog hauv av. Yog tias g = 10 ms^-2, ces qhov siab ntawm lub pej thuam yog...
A. 40 m
B. 25 m
C. 20 m
D. 10 m
E. 5 m
Kev Sib Tham

13. Ib yam khoom hnyav 2 kg poob dawb paug ntawm qhov siab 20 m saum av. Nws siv sijhawm ntev npaum li cas rau yam khoom ntawd kom txog hauv av? (g = 10 ms)^-2)
A. 20 vib nas this
B. 18 vib nas this
C. 10 vib nas this
D. 5 vib nas this
E. 2 vib nas this
Kev Sib Tham
Qhov hnyav ntawm ib yam khoom tsis raug coj los xav txog thaum daws cov teeb meem kev poob dawb.

14. Txiv maj phaub thiab txiv nkhaus poob ua ke los ntawm qhov siab ntawm h₁ thiab h₂Thaum h₁ :h₂ = 2: 1, yog li ntawd qhov piv ntawm lub sijhawm poob ntawm txiv maj phaub thiab txiv nkhaus taw yog ...
A. 1: 2
B. 1: 2√2
C. √2 : 1
D. 2: 1
E. 2√2 : 1
Kev Sib Tham
Nws paub tias:
Txiv maj phaub poob ntawm qhov siab ntawm h₁ = 2
Cov txiv nkhaus taw poob ntawm qhov siab ntawm h₂ = 1
Kev nrawm vim lub ntiajteb txawj nqus = g
Lo lus nug: Kev sib piv ntawm lub sijhawm poob ntawm txiv maj phaub thiab txiv nkhaus taw (t₁ : t₂)
Lus teb:
Muab qhov siab (h) thiab lub sijhawm (t), cov mis siv rau kev poob dawb yog h = 1/2 gt²

Cov lus teb yog D.

15. Ib yam khoom raug poob ntawm qhov siab h saum av. Tom qab mus txog hauv av, nws qhov ceev yog 10 m/s.^-1, ces lub sijhawm uas yuav tsum tau mus txog qhov siab ntawm 1/2 teev ntawm hauv av (g = 10 ms^-2) yog…
A. 1/2 √2 vib nas this
B. 1 vib nas this
C. √2 vib nas this
D. 5 vib nas this
E. 5√2 vib nas this
Kev Sib Tham
Nws paub tias:
Qhov ceev kawg (v_t) = 10 m/s
Kev nrawm vim lub ntiajteb txawj nqus (g) = 10 m/s²
Lo lus nug: Lub sijhawm xav tau kom ncav cuag qhov siab ntawm 1/2 teev ntawm hauv av
Lus teb:
Xam qhov siab h:
Nws yog paub tias v_t thiab g, nug h yog li siv cov mis ntawm kev poob dawb v_t² = 2 g h.

Qhov siab 1/2 h = 1/2 (5 meters) = 2,5 meters. Lub sijhawm uas yuav tsum tau ua kom ncav cuag qhov siab ntawm 2,5 meters ntawm hauv av yog:

16. Saib daim duab hauv qab no!
Qhov kev txav ntawm ib lub txiv maj phaub poob (duab I) thiab qhov kev txav ntawm ib lub pob uas ib tug tub ntxhais kawm pov ntsug mus rau qhov chaw siab tshaj plaws (duab II) muaj hom kev txav….
Kev Sib Tham
Daim Duab 1 = kev txav mus los dawb = kev txav mus los uas nrawm sib npaug (GLBB)
Daim Duab 2 = kev txav mus rau sab saud ntsug = kev txav mus los ntawm txoj kab sib luag uas nrawm nrawm (GLBB) qeeb qeeb
Cov lus teb yog lawm yog A.

Cov lus nug txog kev txav mus los thaum lub caij nplooj zeeg dawb
1. Cov txiv maj phaub tawg ntawm cov qia thiab tuaj txog rau hauv av tom qab ob vib nas this. Qhov ceev ntawm cov txiv maj phaub thaum nws ntaus hauv av yog dab tsi? g = 10 m/s²
Lus teb:
20 m / s
2. Ib yam khoom poob dawb paug los ntawm qhov siab ntawm 20 meters saum av. Txheeb xyuas (a) qhov ceev ntawm txiv maj phaub thaum nws ntaus hauv av (b) Lub sijhawm rau cov txiv hmab txiv ntoo poob kom txog thaum nws mus txog hauv av.
g = 10 m/s²
Lus teb:
(a) = 20 m/s, (b) = 2 vib nas this
3. Ib lub pob raug poob ntawm qhov siab. Txheeb xyuas (a) qhov kev nrawm ntawm cov khoom (b) qhov kev ncua deb uas tau mus txog hauv 5 vib nas this (c) lub sijhawm rau cov khoom kom ncav cuag qhov ceev ntawm 10 m / s
g = 10 m/s²
Lus teb:
(a) = 10 m/s², (b) = 125 meters, (c) 1 vib nas this

[Lus Askiv: Kev poob dawb - teeb meem thiab kev daws teeb meem ]