Fomura yekumanikidza iri mundege yakatsamira

Mibvunzo yemuenzaniso uye mafomura emasimba ari mundege dzakarerekera

1. Simba rinogara rakatwasuka rehukuru hwe50 N rinoshanda pabhokisi rine huremu hwe m = 5 kg. Bhokisi rinokwira kumusoro nespeed yekutanga v._o = 4 m/s pamwe chete nedenderedzwa rakakombama rine kona yekutsvedza θ (kusviba kweganda θ = ¾). Koefficient kukweshana kwekinetic pakati pebhuroko nepamusoro pendege yakatsamira ndeye μ_k = 0,2. Nhambwe yakafambwa nebhuroko isati yamira pakupedzisira ndeye…

A. 10 m

B. 12 m

C. 15 m

D. 18 m

E. 22 m

w = simba rinokwevera pasi

w_x = chikamu chegiravhiti pa x-axis

w_y = chikamu chegiravhiti pa y-axis

F = simba rakatwasuka rinogara riripo

F_x = chikamu chesimba pa x-axis

F_y = chikamu chesimba pa y-axis

N = simba rakajairika

f_k = simba rekukweshana kwekinetic

w = mg = 5 (10) = 50 N

w_x = w sin θ = 50 (3/5) = 30 N

w_y = w cos θ = 50 (4/5) = 40 N

F = 50N

F_x = F cos θ = 50 (4/5) = 40 N

F_y = F sin θ = 50 (3/5) = 30 N

N = w_y +F_y = 40 + 30 = 70 N

f_k = μ_k N = 0,2 (70) = 14 N

Shandisa mutemo wechipiri waNewton:

ΣF = ma

F_x - w_x - f_k = amai

40-30-14 = 5 a

-4 = 5 a

a = -4/5 m/s²

Shandisa fomura yeGLBB kuti uverenge daro rinofambwa nebhuroko usati wamira.

Zvinozivikanwa:

Kumhanya kwekutanga (v)_o) = 4 m/s

Kudzikira kwesimba (a) = -4/5 m/s²

Kumhanya kwekupedzisira (v)_t= = 0

Akabvunzwa: Kufamba kure (daro)

Mhinduro:

v_t² =v_o² + maekisero maviri

0 = 4² + 2 (-4/5) s

0 = 16 – 8/5 s

16 = 8/5 s

16 (5) = 8 s

80 = masekondi mana

s = 80/8

s = mamita zana

Mhinduro chaiyo ndiA.

2. Bhiri rinofamba kubva pakuzorora richidzika pasi rakarerekera. Chikamu chekutanga chekukotama chakatsetseka, uye chikamu chinotevera chichidzika pasi chakakombama. Mushure mekufamba kwenguva pachikamu chakakombama, bhiri rinomira. Muchiitiko ichi…

(1) basa rose pabhuroko harina kuenzana ne zero

(2) basa rinoitwa nesimba rinokwevera zvinhu pasi rine kukosha kwakanaka

(3) basa rinoitwa nesimba rinokwevera zvinhu pasi rakaenzana nekuchinja kwesimba rinogona kushandiswa nebhokisi

(4) basa rinoitwa nekukakavadzana harina kuenzana ne zero

Kukurukurirana

Kune masimba maviri anoshanda pachinhu, anoti simba rinokwevera pasi (gravity) uye kukweshana (friction).

Kana chinhu chikapfuura neparutivi rwakatsetseka, simba regiravhiti chete ndiro rinoita basa pachinhu chacho. Kana chinhu chikapfuura neparutivi rwakatsetseka, pamusoro pesimba regiravhiti, panewo simba rekukweshana rinoshanda pachinhu chacho.

1. Basa rose riri pabhuroko harina kuenzana ne zero.

Kana basa rose riri zero, saka hapana shanduko. Bhokisi rinoona shanduko, saka basa rose harisi zero.

Chirevo 1 ndechechokwadi

2. Basa rinoitwa nesimba rinokwevera zvinhu pasi rine kukosha kwakanaka

Basa rinoitwa nesimba rinokwevera zvinhu pasi rakanaka nekuti divi resimba rinokwevera zvinhu pasi (richienda pasi) rakafanana nedivi rinoenda pasi (richienda pasi).

Chirevo 2 ndechechokwadi

3. Basa rinoitwa nesimba regiravhiti rakaenzana nekuchinja kwesimba regiravhiti rebhokisi, muchiitiko ichi basa rakanaka rinoitwa nesimba regiravhiti rinoita kuti simba regiravhiti rebhokisi riderere.

Chirevo 3 ndechechokwadi

4. Basa rinoitwa nekukweshana harisi zero nekuti chinhu chinoenda kune imwe nzvimbo uye pane simba rekukweshana rinoshanda panguva yekukweshana.

Chirevo 4 ndechechokwadi

Kufamba kwakatwasuka

3. Kubhiti rinotsvedza pasi rakarerekera pasina kukweshana rinozoramba richimhanya.

Nokuti

Kana pasina kukweshana, kukurumidza kwechinhu kwakaenzana nekumhanya kunokonzerwa negiravhiti.

Kukurukurirana

Kana pasina kukweshana, cube inotsvedza pasi nekukurumidzisa nguva dzose. Mukudonha kwakasununguka, chinhu chinodonha nekukurumidzisa g, uko g iri kukurumidza kunokonzerwa negiravhiti.

Panguva iyi, panenge pakarerekera, chinhu chinotsvedza pasi ne acceleration gx, uko kukosha kwe gx kuri kudiki pane kukurumidza nekuda kwegravity. Kukosha kwe gx kunoenderanawo nehukuru hwe angle yekurerekera.

Kwakabva mibvunzo

Mibvunzo yeFizikisi yeSBMPTN