Chitsanzo cha mphamvu yothanzi ya kasupe

Zitsanzo 5 za mafunso okhudza mphamvu yokhazikika ya masika

1. Kasupe amapatsidwa katundu wa makilogalamu awiri ndipo amapachikidwa moyimirira pa choyimilira. Ngati kasupeyo amatalika ndi masentimita 4, ndiye kuti kusintha kwa mphamvu zomwe zingatheke Mphamvu yotanuka ya kasupe ndi… g = 10 m/s²
Zokambirana
Ndizodziwika kuti :
Kulemera kwa katundu (m) = 2 kg
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²
Kulemera kwa katundu (w) = mg = (2)(10) = 20 Newton
Kuwonjezeka kwa kutalika kwa kasupe (x) = 4 cm = 0,04 mamita
Anafunsa : Mphamvu yolimba ya masika
Yankhani :
Fomula Lamulo la Hooke ndi F = kx, pomwe F = mphamvu, k = kasupe wosasintha ndipo x = kuwonjezeka kwa kutalika kwa kasupe. Ngati isinthidwa kuti igwirizane ndi vutoli, ndiye kuti njira ya Hooke ya malamulo imasinthidwa kukhala w = kx, pomwe w = mphamvu yokokaKuti muwerengere nthawi yokhazikika ya masika, sinthani njira ya malamulo ya Hooke kukhala k = w / x. Kotero nthawi yokhazikika ya masika ndi k = w / x = 20 / 0,04 = 500 Newton/mita.
Kusintha kwa mphamvu ya elasticity ya masika ndi:
EP = ½ kx² = ½ (500)(0,04)² = (250)(0,0016) = 0,4 Joule

Kusintha kwa mphamvu yokhazikika ya kasupe kungawerengedwenso pogwiritsa ntchito njira imodzi:
EP = ½ kx² = ½ (w / x) x² = ½ wx = ½ mgx
Kufotokozera: w = mphamvu ya kulemera kwa katundu, m = kulemera kwa katundu, x = kusintha kwa kutalika kwa kasupe.
EP = ½ (2)(10)(0,04) = (10)(0,04) = 0,4 Ma Joules.

2. Kuti mutambasule kasupe wa masentimita 10, mphamvu ya 50 N imafunika. Mphamvu yotanuka yomwe imafunika kuti mutambasule kasupe wa masentimita 12 ndi…
Zokambirana
Ndizodziwika kuti :
Kuwonjezeka kwa kutalika kwa kasupe (x) = 10 cm = 0,1 mamita
Mphamvu (F) = 50 Newtons
Anafunsa : mphamvu yotha kusinthasintha ya kasupe kuti itambasule kasupeyo mpaka 12 cm kapena 0,12 metres.
Yankhani :
Chokhazikika cha masika ndi:
k = F / x = 50 / 0,1 = 500 Newtons/mita
Kasupe wogwiritsidwa ntchito ndi womwewo, motero kasupe wosasinthika wopezeka mu kuwerengera kwapitako umagwiritsidwa ntchito kuwerengera mphamvu ya elastic potential ya kasupe kuti atambasule kasupeyo ndi mamita 0,12.
EP = ½ kx² = ½ (500)(0,12)² = (250)(0,0144) = 3,6 Joules.

3. Chithunzi chomwe chili pansipa chikuwonetsa ubale pakati pa mphamvu (F) ndi kuwonjezeka kwa kutalika kwa kasupe (x). Ngati kasupe wasokonekera ndi 10 cm, ndiye kuti mphamvu yolimba ya kasupe ndi…

Zokambirana
Ndizodziwika kuti :
Mphamvu (F) = 5 Newtons
Kuwonjezeka kwa kutalika kwa kasupe (x) = 2 cm = 0,02 mamita
Anafunsa : mphamvu yomwe ingakhalepo ya kasupe ngati kasupeyo wasokonekera ndi masentimita 10 kapena mamita 0,1.
Yankhani :
Chokhazikika cha masika:
k = F / x = 5 / 0,02 = 250 Newtons/mita
Mphamvu yomwe ingakhalepo ya kasupe ngati kasupeyo wasokonekera ndi mamita 0,1:
EP = ½ kx² = ½ (250)(0,1)² = (125)(0,01) = 1,25 Joules.

Mphamvu Yotha Kutanuka
4. Kasupe amapatsidwa katundu wa makilogalamu awiri monga momwe chithunzi chilili. Ngati kasupeyo wakula ndi kutalika kwa masentimita 5 kuthamanga chifukwa cha mphamvu yokoka dziko lapansi 10 ms^-2, ndiye kuti mphamvu yotha kusinthasintha ya kasupe ndi...
A. 4,0 J
B. 3,0 J
C. 2,5 J
D. 1,0 J
E. 0,5 J
Zokambirana
Ndizodziwika kuti :
Kuwonjezeka kwa kutalika (Δx) = 5 cm = 0,05 mamita
Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s²
Kulemera kwa katundu (m) = 2 kg
Kulemera kwa katundu (w) = mg = (2)(10) = 20 Newton
Anafunsa Mphamvu yomwe ingakhalepo ya rabara?
Yankhani :
Choyamba, werengani kuchuluka kwa elastic constant ya kasupe pogwiritsa ntchito njira ya Hooke's law:
k = w / Δx = 20 / 0,05 = 400 N/m
Mphamvu yotanuka ya masika ndi:
EP = ½ k Δx² = ½ (400)(0,05)² = (200)(0,0025)
EP = 0,5 Joule
Yankho lolondola ndi E.

5. Kuti kasupe atambasule masentimita 5, mphamvu ya 20 N imafunika. Mphamvu yomwe kasupe angayike masentimita 10 ndi…
A. 2 Joule
B. 4 Joule
C. 20 Joule
D. 50 Joule
E. 100 Joule
Zokambirana
Ndizodziwika kuti :
Kuwonjezeka kwa kutalika (Δx) = 5 cm = 0,05 mamita
Mphamvu (F) = 20 Newtons
Anafunsa EP ya kasupe pamene kasupe imatambasula 10 cm?
Yankhani :
Chokhazikika cha masika:
k = F / Δx = 20 / 0,05 = 400 N/m
Mphamvu yomwe ingakhalepo ya masika pamene Δx = 10 cm = 0,1 metres:
EP = ½ k Δx² = ½ (400)(0,1)² = (200)(0,01)
EP = 2 Joule
Yankho lolondola ndi A.