Ukunyakaza kokuwa okukhululekile - izinkinga nezixazululo

Ukunyakaza kokuwa okukhululekile - izinkinga nezixazululo

1. Itshe liwa ngokukhululeka lisuka ekuphakameni kwamamitha angu-45. Uma ukusheshisa ngenxa yamandla adonsela phansi kungu-10 ms ^-2 , lingakanani ijubane letshe uma lishaya phansi?

Kwaziwa:

Ukuphakama (h) = amamitha angu-45

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ²

Okufunwayo: Ijubane lokugcina letshe lapho lishaya phansi (v _t )

Isixazululo:

Isibalo sokunyakaza kokuwa kwamahhala :

v _t ² = 2 gh

Ijubane lokugcina letshe:

v _t ² = 2 (10)(45) = 900

v _t = √900 = 30 m/s ²

2. Into ekhululekile iwela ekuphakameni ngaphandle kwejubane lokuqala. Into ishaya phansi ngemva kwemizuzwana emi-2. Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 ms ^-2 . Thola ukuphakama

Kwaziwa:

Isikhawu sesikhathi (t) = imizuzwana eyi-2

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ²

Okufunwayo: Ukuphakama (h)

Isixazululo:

Isibalo sokunyakaza kokuwa kwamahhala:

h = ½ gt ²

Ukuphakama:

h = ½ (10)(2) ² = (5)(4) = amamitha angu-20

3. Into engamakhilogremu amabili iwela ngaphandle kokuphakama kwamamitha angama-20 ngaphezu komhlabathi. Iyini isikhathi sento esemoyeni? Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 ms ^-2

Kwaziwa:

Ukuphakama (h) = amamitha angu-20

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ²

Okufunwayo : Isikhathi esiphakathi (t)

Isixazululo:

Isibalo sokunyakaza kokuwa kwamahhala:

h = ½ gt ²

Isikhawu sesikhathi:

20 = ½ (10)(t ² )

20 = (5)(t ² )

20/5 = t ²

4 = t ²

t = √4

t = imizuzwana emi-2

4. Izinto ezimbili, into 1 kanye nento 2, ziwukuwa ngokukhululeka kusuka ekuphakameni okungu-h ₁ kanye no-h ₂ ngesikhathi esisodwa. Uma u-h ₁ : h ₂ = 2: 1, siyini isilinganiso sesikhathi esisuka entweni 1 kuya entweni 2.

Kwaziwa:

Ukuphakama kwento 1 (h ₁ ) = 2

Ukuphakama kwento 2 (h ₂ ) = 1

Ukusheshisa ngenxa yamandla adonsela phansi = g

Kufunwa: t ₁ : t ₂

Isixazululo:

Into 1:

h ₁ = 1/2 gt _{​​​​1} ²

2 = 1/2 = ₁ ²

(2)(2) = gt ₁ ²

4 = gt ₁ ²

4/g = t ₁ ²

t ₁ = √4/g

Into 2:

h ₂ = 1/2 gt _{​​​​2} ²

1 = 1/2 = ₂ ²

(2)(1) = gt ₂ ²

2 = gt ₂ ²

2/g = t ₂ ²

t ₂ = √2/g

Isilinganiso sezikhawu zesikhathi:

t ₁ : t ₂

√4/g : √2/g

(√4/g) ² : (√2/g) ²

4/g: 2/g

4: 2

2: 1

5. Into eyehla isuka ekuphakameni okungu-h ngaphezu komhlabathi. Ijubane lokugcina lapho into ishaya phansi lingu-10 m/s. Yisiphi isikhathi esinqunyiwe sokufinyelela ku-½ h ngaphezu komhlabathi. Ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s ².

Kwaziwa:

Ijubane lokugcina (v _t ) = 10 m/s

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ²

Okufunwayo: Isikhathi sokufinyelela ihora elilodwa nesigamu ngaphezu komhlabathi

Isixazululo:

Ukuphakama kwe-h:

v _t ² = 2 gh

10 ² = 2 (10) amahora

100 = amahora angu-20

h = 100/20

h = amamitha angu-5

Ukuphakama kwe-1/2 h = 1/2 (amamitha ama-5) = amamitha ama-2.5. Isikhathi esidingekayo ukuze sifinyelele amamitha ama-2.5 ngaphezu komhlabathi:

h = 1/2 gt ^{​​​​2}

2.5 = 1/2 (10) t ²

2.5 = 5 t ²

t ² = 2.5 / 5 = 0.5 = (0.25)(2)

t = √(0.25)(2) = 0.5√2 = 1/2 √2 imizuzwana

6.

Ukunyakaza kwe-coconut okukhululekile kokuwa ( isithombe 1 ) kanye nokunyakaza kwebhola eliphonswe phezulu phezulu liye endaweni ephakeme kakhulu ngumfundi (isithombe e 2). Nquma uhlobo lwazo zombili lezi zinyathelo.

Isixazululo:

Umfanekiso 1 = ukunyakaza kokuwa okukhululekile = Ukusheshisa

Umfanekiso 2 = ukunyakaza okuqondile = Ukwehla kwejubane

Impendulo eyiyo ngu-A.

7. Itshe liwa ngokukhululeka esakhiweni. Isikhathi esidingekayo ukuze itshe lifike phansi singamasekhondi angu-3 kanti ukusheshisa ngenxa yamandla adonsela phansi kungu-10 m/s ^2. Nquma ukuphakama kwesakhiwo.

A. 15 m

B. 20 m

C. 30 m

D. 45 m

Kwaziwa:

Isikhawu sesikhathi (t) = imizuzwana eyi-3

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 ms ^-2

Okufunwayo: Ukuphakama kwesakhiwo (h)

Isixazululo:

Okuyaziwayo: isikhawu sesikhathi (t) kanye nokusheshisa ngenxa yamandla adonsela phansi (g), okufunwayo: ukuphakama (h) ngakho sebenzisa isibalo sokunyakaza kokuwa okukhululekile: h = ½ gt ²

h = ½ (10)(3)

h = (5)(3)

h = amamitha ayi-15

Impendulo eyiyo ngu-A.

8. Isithelo siwa ngokukhululeka esihlahleni saso ngokuphakama okungamamitha ayi-12 ngaphezu komhlabathi. Uma ukusheshisa ngenxa yamandla adonsela phansi kungu-g = 10 m/s ² futhi ukungqubuzana komoya kunganakwa, khona-ke nquma ukuphakama kwesithelo ngaphezu komhlabathi ngemva komzuzwana owodwa.

A. 7 m

B. 6 m

C. 5 m

D. 4 m

Kwaziwa:

Ukuphakama kwesihlahla (h) = amamitha ayi-12

Ukusheshisa ngenxa yamandla adonsela phansi (g) = 10 m/s ²

Isikhawu sesikhathi (t) = umzuzwana o-1

Okufunwayo: Ukuphakama kwesithelo ngaphezu komhlabathi

Isixazululo:

Ngemva komzuzwana owodwa, izithelo azinawo amahlumela aze afike ku:

h = ½ gt ² = ½ (10)(1) ² = (5)(1) = amamitha ama-5

Ukuphakama kwesithelo ngaphezu komhlabathi ngemva kwesekhondi elilodwa:

Amamitha ayi-12 – amamitha ama-5 = amamitha ayi-7

Impendulo eyiyo ngu-A.

1. Kuyini ukunyakaza kokuwa okukhululekile?

   Impendulo : Ukunyakaza kokuwa okukhululekile kubhekisela ekunyakazeni kwento ngaphansi kwethonya lamandla adonsela phansi kuphela, kungekho amanye amandla (njengokumelana nomoya) asebenzayo kuyo.

2. Ukusheshisa okubangelwa amandla adonsela phansi, okuvame ukuboniswa kanjani $g$, kuthinta into ewa ngokukhululeka?

   Impendulo : Zonke izinto eziwela phansi ngokukhululeka eduze kobuso boMhlaba zithola ukusheshisa okuqhubekayo ngenxa yamandla adonsela phansi, $g$ , okungaba ngu- 9.81 m/s ² phansi. Lokhu kusho ukuthi ijubane lento likhuphuka ngaleli nani ngomzuzwana ngamunye wokuwa phansi ngokukhululeka.

3. Uma ukumelana nomoya kuncane, isisindo sento sithinta kanjani ukusheshisa kwayo ukuwa ngokukhululekile?

   Impendulo : Uma kungekho ukumelana nomoya, isisindo sento asithonyi ukusheshisa kwayo kokuwa ngokukhululeka. Zonke izinto, kungakhathaliseki ukuthi zinobunzima obunjani, zizowa ngokusheshisa okufanayo ngenxa yamandla adonsela phansi, $g$.

4. Kungani kubonakala sengathi osomkhathi bantanta ngaphakathi kwe-International Space Station (ISS) uma amandla adonsela phansi esekhona lapho?

   Impendulo : Osomkhathi abangaphakathi kwe-ISS babonakala bentanta hhayi ngoba kungekho amandla adonsela phansi, kodwa ngoba bobabili osomkhathi kanye ne-ISS basesimweni esiqhubekayo sokuwa ngokukhululeka emhlabeni. Empeleni bawa ngesivinini esifanayo ne-ISS, okwenza kube nomuzwa wokungabi nesisindo.

5. Uyini umehluko phakathi kwesisindo nobunzima uma kukhulunywa ngokuwa kwamahhala?

   Impendulo : Isisindo siyindlela yokulinganisa inani lezinto entweni futhi sihlala singaguquki kungakhathaliseki ukuthi sikuphi. Isisindo, ngakolunye uhlangothi, amandla asetshenziswa entweni ngenxa yamandla adonsela phansi. Siyahlukahluka kuye ngensimu yamandla adonsela phansi. Ngesikhathi sokuwa okukhululekile, into izizwa ingenasisindo ngoba awekho amandla avamile asebenzayo kuyo, kodwa isisindo sayo asishintshi.

6. Uma into iphonswa phezulu, kwenzekani ngejubane layo njengoba ikhuphuka? Futhi kwenzekani uma iqala ukuwa phansi futhi?

   Impendulo : Uma into iphonswa phezulu, yehla ngamandla ngaphansi kwethonya lamandla adonsela phansi. Ijubane layo liyancipha kuze kube yilapho iba yi-zero endaweni yayo ephezulu. Njengoba iqala ukuwa phansi, ishesha ngenxa yamandla adonsela phansi, ikhulisa ijubane layo liye phansi.

7. Iyini ijubane lokugcina esimweni sokuwa kwamahhala?

   Impendulo : Ijubane le-terminal yijubane eliphezulu elingaguquki elifinyelelwa yinto ewayo lapho amandla adonsela phansi aphansi elinganiswa ngamandla aphezulu okumelana nomoya. Kuleli qophelo, into ayisasheshi futhi iyaqhubeka nokuwa ngesivinini esingaguquki.

8. Ukuphakama into ewela kukho kuthinta kanjani isikhathi esithathwayo ukuze ifike phansi?

   Impendulo : Isikhathi esithathwayo ukuze into ifike phansi silingana nempande yesikwele yokuphakama lapho iwela khona (uma kubhekwa ukuthi akukho ukumelana nomoya). Into ewile isuka ekuphakameni okukhulu izothatha isikhathi eside ukufika phansi kuneleyo ewile isuka ekuphakameni okufushane.

9. Kwenzekani emandleni angaba khona ento njengoba iwela ngokukhululeka ngaphansi kwamandla adonsela phansi?

   Impendulo : Njengoba into iwela ngokukhululeka ngaphansi kwamandla adonsela phansi, amandla ayo angase abe khona (uma eqhathaniswa nomhlabathi) ayancipha. Lokhu kwehla kwamandla angase abe khona kuguqulwa kube amandla e-kinetic, okwenza ijubane lento lande.

10. Uma izinto ezimbili ezinezimo ezahlukene kodwa ezinobunzima obufanayo ziwa zisuka ekuphakameni okufanayo endaweni engenalutho, yikuphi okuzoshaya phansi kuqala?

Impendulo : Endaweni engenamoya, lapho kungekho ukumelana nomoya, zombili izinto zizoshaya phansi ngesikhathi esisodwa. Isimo sazo ngeke sibaluleke ngoba amandla adonsela phansi kuphela asebenza kuzo, futhi ubukhulu bazo buyafana.