Foromo ea molao oa paballo ea matla a mechini, matla a ka bang teng a selemo, mechine e bonolo

Mehlala ea lipotso le mekhoa ea molao oa paballo ea matla a mechini, matla a ka bang teng a selemo, mechine e bonolo

Molao oa paballo ea matla a mechini

1. Ntho e na le matla a sa fetoheng a mechini, e eketsang matla a kinetic, le e fokotsang matla a khoheli. Ntho e boemong ba….

1. bophara
2. nyoloha
3. theohela tlase
4. ho nyoloha ka potlako

Puisano
Ha matla a kinetic a le maholo, lebelo la ntho le ba le leholo, 'me matla a khoheli a ba manyane, bophahamo ba ntho bo ba tlase ka holim'a lefatše. Sena se etsahala ha ntho e tloha bophahamong bo itseng ho ea tlase ho ea fatše.

Kamano pakeng tsa lebelo le matla a kinetic e bontšoa ke foromo ea matla a kinetic:
EK = ½ mv²
Tlhaloso ea foromo: EK = matla a kinetic, m = boima, v = lebelo

Kamano pakeng tsa bophahamo le matla a khoheli e bontšoa ke foromo ea matla a khoheli:
EP = mgh
Tlhaloso ea foromo: EP = matla a khoheli a ka bang teng, m = boima, g = ho potlaka ha khoheli, h = bolelele
Karabo e nepahetseng ke C.

Mochini o bonolo
2. Karolelano ea bolelele a le b setšoantšong sa mochini o bonolo ke : b = 1 : 2,2. Boleng bo tlase ba matla a ho phahamisa mojaro B bo boima ba 330 Newtons ke…. Newton

1. 100
2. 150
3. 2200
4. 7260

Puisano
Hoa tsebahala hore:
Bolelele a = letsoho la mojaro (l)_B= 1
Bolelele b = letsoho la matla (l)_F= 2,2
Boima ba mojaro (w) = 330 Newtons
O botsitse: Matla a ho sebelisa matla (F)
Karabo:
Foromo ea melemo ea mechini ea mochini o bonolo oa lever:
KM = w / F = l_F / l_B
Lintlha :
KM = monyetla oa mechine, w = matla a khoheli, F = leverage, l_F = letsoho la ho qobella, l_B = letsoho la mojaro
 
w / F = l_F / l_B
330 / F = 2,2 / 1
330 / F = 2,2
330 / 2,2 = F
F = 150 Newton
Karabo e nepahetseng ke B.

3. Sheba setšoantšo se ka lehlakoreng. Seithuti se tsamaisa ntho ho tloha ntlheng ea A ho ea ntlheng ea B ka matla a F joalo ka ha ho bontšitsoe setšoantšong. Haeba khohlano pakeng tsa ntho le boto e hlokomolohuoa, joale molemo oa ts'ebetso ke oa….

1. 4
2. 5/3
3. 5/4
4. 3/4

Puisano
Hoa tsebahala hore:
Bophahamo ba sefofane se sekametseng (y) = limithara tse 4 - limithara tse 1 = limithara tse 3
Bolelele ba sebaka se bataletseng (x) = limithara tse 4
O botsitse: Molemo oa mechine (MC) oa sefofane se sekametseng
Karabo:
Bala bolelele ba sefofane se sekametseng o sebedisa foromo ya Pythagorean:
R = √3²+4² = √9+16 = √25 = limithara tse 5
Melemo ea mechine ea sefofane se sekametseng:
KM = R / y
KM = limithara tse 5 / limithara tse 3
KM = 5/3
Karabo e nepahetseng ke B.

Matla a ka Khonehang a Selemo

4. Lebala la ho qoela le sebedisa motheo o tletseng selemo ho fana ka kgatello e hodimo bakeng sa moatlelete ho qala ho tlola. Ha moatlelete a tlola hodima lona ka matla a 500 N, selemo se kgutsufala ka 4 cm. Bongata ba matla a ka bang teng a fanwang ke selemo ho tsamaisa moatlelete ke….

1. Li-joule tse 20
2. Li-joule tse 10
3. Li-joule tse 5
4. Li-joule tse 2

Puisano
Hoa tsebahala hore:
Matla (F) = 500 N
Phetoho boleleleng ba selemo (Δx) = 4 cm = 0,04 m
O botsitse: Matla a ka bang teng nakong ea selemo
Karabo:
Taba ea pele, bala sekhahla se tenyetsehang sa selemo u sebelisa foromo ea molao ea Hooke:
k = F / Δx = 500 N / 0,04 m = 12500 N/m
Matla a kgonego a ho tenyetseha a selemo ke:
EP = ½ k Δx² = ½ (12500)(0,04)² = (6250)(0,0016)
EP = 10 Joule
Karabo e nepahetseng ke B.

Mohloli oa lipotso:

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