Izibonelo eziyi-12 zemibuzo elula yomshini
1. Bheka isithombe se-pulley egxilile ohlangothini! Ukuze uyiphakamise, kudingeka amandla u-F.
likhulu njenge…
A. 50 N
B. 100 N
C. 200 N
D. 1000 N
Ingxoxo
Isisindo somthwalo = ama-Newton ayi-100. Ukuze kuphakanyiswe umthwalo, kudingeka amandla amancane angama-Newton ayi-100.
Impendulo efanele ingu-B.
2. Bheka isithombe!
Inzuzo yobuchwepheshe ye-lever…
A. 1
B. 1,5
C. 2,5
D. 10
Ingxoxo
Kuyaziwa ukuthi:
Isisindo (w) = 75 Newtons
Amandla (F) = 7,5 Newton
Ingalo Yamandla (LK) = 50 cm
Ingalo Yomthwalo (LB) = 5 cm
Kubuziwe: Inzuzo yemishini (KM)
Impendulo:
Ifomula yenzuzo yomshini we-lever:
KM = w / F noma KM = LK/LB
Ulwazi: I-KM = inzuzo yomshini, i-w = isisindo somthwalo, i-F = amandla, i-LK = ingalo yamandla, i-LB = ingalo yomthwalo.
Inzuzo yomshini we-lever ibalwa kusetshenziswa ifomula engenhla:
KM = w/F = 75 Newtons / 7,5 Newtons = 10 noma
I-KM = LK/LB = 50 cm /5 cm = 10
Impendulo efanele ngu-D.
3. Bheka isithombe esilandelayo se-lever!
Ubukhulu bamandla okuphakamisa idwala…
A. 2.250 AmaNewton
B. 1.500 AmaNewton
C. 750 AmaNewton
D. 500 AmaNewton
Ingxoxo
Kuyaziwa ukuthi:
Isisindo somthwalo (w) = 1500 Newton
Ingalo yomthwalo (Lb) = amamitha angu-0,5
Ingalo yamandla (Lk) = 1,5 amamitha
Kubuziwe: Amandla (F)
Impendulo:
Ifomula yenzuzo yomshini we-lever:
Km = w / F noma Km = Lk/Lb
Incazelo yefomula:
I-Km = inzuzo yomshini, w = isisindo somthwalo, F = amandla, Lk = ingalo yamandla, Lb = ingalo yomthwalo.
Inzuzo yemishini:
I-Km = I-Lk/I-Lb = 1,5/0,5 = 3
Isitayela esikhulu:
Km = w / F
F = w / Km
F = 1500 Newtons / 3
F = 500 Newton
Impendulo efanele ngu-D.
4. Bheka isithombe!
Kumamashini amane alula angenhla, lowo osebenzisa isimiso sendiza ethambekele...
A. 1 no-2
B. 1 no-3
C. 2 no-3
D. 3 no-4
Ingxoxo
Umshini olula uyithuluzi elisetshenziselwa ukwenza umsebenzi womuntu ube lula. Isibonelo, uma unenkinga yokuphakamisa into iye ekuphakameni okuthile, indiza ethambekele ingasetshenziswa. Ukusunduza into endizeni ethambekele kudinga amandla amancane kunokuyiphakamisa ngqo. Kulesi simo, into iyahamba ngenkathi indiza ethambekele ihlala imile.
Indiza ethambekele esithombeni esingenhla ithi indiza ethambekele okusamile. Kunezindilinga ezithambekile eziyimishini elula enganyakaza, okungukuthi izikulufu (1) kanye nama-wedge. Izibonelo zama-wedge yizimbazo (2), imimese kanye nama-chisel. Kulokhu, into imile ngenkathi indilinga ethambekile ihamba.
Impendulo efanele ngu-A.
5. Umshini olandelayo olula osebenzisa isimiso se-lever...
Ingxoxo
Uhlobo olulodwa lomshini olula yi-lever. I-lever iyithuluzi elandisa amandla, lapho amandla akhiqizwayo emakhulu kunamandla akhishwayo. Kunezinhlobo ezintathu zama-lever, okungukuthi ama-lever ekilasi lokuqala, ama-lever ekilasi lesibili kanye nama-lever ekilasi lesithathu. Isici se-lever yekilasi lokuqala ukuthi i-fulcrum iphakathi kwamandla nomthwalo, isibonelo isikele kanye ne-pliers. Isici se-lever yekilasi lesibili ukuthi umthwalo uphakathi kwe-fulcrum namandla, isibonelo i-nail puller kanye ne-stapler. Isici se-lever yekilasi lesithathu ukuthi amandla aphakathi komthwalo ne-fulcrum, isibonelo ibhulashi.
Umfanekiso B uyisibonelo se-lever yesigaba sesibili, lapho umthwalo uphakathi kwe-fulcrum (isondo) namandla (amandla okuphakamisa kanye namandla okucindezela abantu).
Impendulo efanele ingu-B.
6. Umshini olula olandelayo unesimiso sokusebenza esifanayo nomshini olula ongenhla, okungukuthi...
Ingxoxo
Umshini olula esithombeni esingenhla uyi-lever. I-lever iyithuluzi lokukhulisa amandla, lapho amandla avelayo emakhulu kunamandla asetshenziswayo. Kunezinhlobo ezintathu zama-lever: ama-lever ekilasi lokuqala, ama-lever ekilasi lesibili, kanye nama-lever ekilasi lesithathu.
Isici se-lever yekilasi lokuqala ukuthi i-fulcrum iphakathi kwamandla nomthwalo, isibonelo ama-lever, izikele kanye ne-pliers.
Isici se-lever yesigaba sesibili ukuthi umthwalo uphakathi kwe-fulcrum kanye namandla, isibonelo i-nail puller kanye ne-stapler.
Isici se-lever yesigaba sesithathu ukuthi amandla aphakathi komthwalo kanye ne-fulcrum, isibonelo ibhulashi.
Isithombe esikumbuzo ongenhla siyi-lever kanye nomshini olula osebenza ngendlela efanayo ne-lever njengesikelo.
Impendulo efanele ngu-C.
7. Bheka umdlalo we-seesaw njengoba kuboniswe esithombeni esilandelayo!
Isisindo sengane u-A sikhulu kunesomntwana u-B. Ukuze i-seesaw ilingane, indawo efanele...
A. I-fulcrum T ishintshelwa endaweni ethi P
B. Ingane u-B udlulela ephuzwini R
C. Ingane A iya endaweni ethi P
D. Ingane B iya endaweni ethi Q
Ingxoxo
I-seesaw iyisibonelo somshini olula we-lever. Ifomula yenzuzo yawo yemishini yile:
KM = w lb = F lk
Imininingwane:
KM = inzuzo yomshini,
w = umthwalo
lb = ingalo yomthwalo = ibanga phakathi komthwalo kanye ne-fulcrum. I-fulcrum esithombeni ingu-T
F = amandla
lk = ingalo yamandla = ibanga phakathi kwamandla kanye ne-fulcrum. I-fulcrum esithombeni ingu-T
Ngokusekelwe kufomula engenhla, ukuze umkhiqizo womthwalo (w) kanye nengalo yomthwalo (lb) ufane nomkhiqizo wamandla (F) kanye nengalo yamandla (lk), khona-ke uma umthwalo mkhulu futhi amandla amancane, ingalo yomthwalo (lb) kumele ibe ncane kanti ingalo yamandla (lk) kumele ibe nkulu.
Bheka isithombe esingenhla. Uma u-A engumthwalo omkhulu kanti u-B engumandla amancane, khona-ke ibhalansi iyenzeka lapho ingalo yomthwalo incane kanti ingalo yamandla inkulu.
Ingalo yomthwalo iba ncane ngemva kokuba ingane u-A ishintshele ku-P.
Impendulo efanele ngu-C.
8.
Bheka isithombe esingezansi!
Kulezi zindiza ezine ezithambekele ngenhla, leyo enenzuzo efanayo yomshini iboniswe kunombolo yesibalo….
A. (1) kanye no-(2)
B. (1) kanye no-(3)
C. (2) kanye no-(4)
D. (3) kanye (4)
Ingxoxo
Indiza ethambekele umshini olula. Imishini elula ingamathuluzi asiza abantu ukwenza imisebenzi. Izindiza ezithambekele zisetshenziselwa ukwenza kube lula ngabantu ukuphakamisa izinto ziye phezulu.
Inzuzo yomshini wendiza ethambekele yisilinganiso sobude bendiza ethambekele nokuphakama kwendiza ethambekele.
Inzuzo yemishini yendiza ethambekele 1 = 5 cm / 2 cm = 2,5
Inzuzo yemishini yendiza ethambekele 2 = 3 cm / 2 cm = 1,5
Inzuzo yemishini yendiza ethambekele 3 = 3 cm / 1 cm = 3
Inzuzo yemishini yendiza ethambekele 4 = 12 cm / 4 cm = 3
Inzuzo efanayo yemishini iboniswa yizibalo (3) kanye (4).
Impendulo efanele ngu-D.
9.
Ezinye izindiza ezithambekele zinobukhulu obufana nobesithombe.
Leyo enenzuzo efanayo yomshini yindiza ethambekele….
A. (1) kanye no-(2)
B. (1) kanye no-(3)
C. (2) kanye no-(4)
D. (3) kanye (4)
Ingxoxo
Inzuzo yemishini yendiza ethambekele 1 = 3,2 m / 80 cm = 320 cm / 80 cm = 4
Inzuzo yemishini yendiza ethambekele 2 = 3,6 m / 90 cm = 360 cm / 90 cm = 4
Inzuzo yemishini yendiza ethambekele 3 = 3 m / 120 cm = 300 cm / 120 cm = 2,5
Inzuzo yemishini yendiza ethambekele 4 = 4 m / 125 cm = 400 cm / 125 cm = 3,2
Inzuzo efanayo yemishini iboniswa yizibalo (1) kanye (2).
Impendulo efanele ngu-A.
10.
Bheka isithombe esilandelayo sendiza ethambekele!
Indiza ethambekele enenzuzo efanayo yomshini….
A. (1) kanye no-(2)
B. (1) kanye no-(3)
C. (2) kanye no-(3)
D. (3) kanye (4)
Ingxoxo
Inzuzo yemishini yendiza ethambekele 1 = 3 m / 1,2 m = 2,5
Inzuzo yemishini yendiza ethambekele 2 = 5 m / 2 m = 2,5
Inzuzo yemishini yendiza ethambekele 3 = 4 m / 1,5 m = 2,6
Inzuzo yemishini yendiza ethambekele 4 = 3,6 m / 1,2 m = 3
Inzuzo efanayo yemishini iboniswa yizibalo (1) kanye (2).
Impendulo efanele ngu-A.
11. Imishini elula
Bheka isithombe esilandelayo se-lever.
Ibanga AB = BC = CD = DE, inani lamandla okumele asetshenziswe ephuzwini E ukuze i-lever ilinganiswe…
A. 300 N
B. 450 N
C. 750 N
D. 900 N
Ingxoxo
Kuyaziwa ukuthi:
AB = BC = CD = DE = l
Ingalo yomthwalo (Lb) = l
Ingalo yamandla (Lk) = 3l
Isisindo somthwalo (w) = 900 Newton
Kubuziwe: Amandla (F)
Impendulo:
Inzuzo yemishini:
I-Km = I-Lk/I-Lb = 3l/I-L = 3
Isitayela esikhulu:
Km = w / F
F = w / Km
F = 900 Newtons / 3
F = 300 Newton
Impendulo efanele ngu-A.
12. Bheka isithombe sesivikelo esingezansi!
Umthwalo ube usushintshwa usondele ku-10 cm eduze kwe-fulcrum. Ukuze kugcinwe ibhalansi ye-lever, amandla kumele abe...
A. kanye no-54 N
B. susa 64 N
C. kanye no-75 N
D. susa 96 N
Ingxoxo
Bala ingalo yamandla (Lk)
Kuyaziwa ukuthi:
Ingalo yomthwalo (Lb) = 25 cm
Isisindo somthwalo (w) = 480 Newton
Amandla (F) = 160 N
Kubuziwe: Ingalo yamandla (Lk)
Impendulo:
Inzuzo yemishini (Km):
Km = w / F = 480 Newtons / 160 N = 3
Ingalo yamandla (Lk):
Km = Lk/Lb
3 = ULk/25 cm
ULk = (3)(25 cm)
Ububanzi = 75 cm
Bala ubukhulu bamandla (F)
Kuyaziwa ukuthi:
Ingalo yomthwalo (Lb) = 25 cm – 10 cm = 15 cm
Isisindo somthwalo (w) = 480 Newton
Ingalo yamandla (Lk) = 75 cm
Kubuziwe: Amandla (F)
Impendulo:
Inzuzo yemishini (Km):
Km = Lk/Lb
Amakhilomitha = 75 cm / 15 cm
Amakhilomitha = 5
Ubukhulu bamandla (F):
Km = w / F
F = w / Km
F = 480 Newtons / 5
F = 96 Newton
Ukuze i-lever ibe sesimweni esilinganiselayo, amandla ancishiswa ngama-Newton angu-64 (160 N - 96 N).
Impendulo efanele ingu-B.
Umthombo wombuzo:
Imibuzo Yokuhlolwa Kazwelonke Yesayensi Yesikole Samabanga Aphansi/Isikole SamaSulumane Samabanga Aphakeme
