فيزياء: أي استفسار أول سؤال

[سمر يوسف]

السلام عليكم أستاذ عندي أسئلة كثيرة .. الله يعينك ويعينااا

بسألك ن فكرة الـ instant velocity

وعن a avg=v-v0/t-0
ليش صفر بالبسط ؟؟

عندي فقرات بالكتاب sample broblem مش فاهمتها ..
الاولى /
the position of a particle moving on an axis is given by
x=7.8+9.2t^3
with x in meters and t in seconds what is its velocity
at t=3.5 ?
is the velocity constant or it continously changing ?

a particle's position on the axis is gevin by x=4-27t+t^3

with x in meters and t in seconds
a)Because position x depends on time t,the particle must be moving .
find the particle's velocity function v(t)and acceleration a(t)..

وبالنسبة للـ vector

can be shifted without changing its value if its lentgh and direction

..are not changed

the displacement vectors tells us nothing about the actual
path that the particle takes

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on paper sketch vector a some convenient vectors1 anddirectiongeometric ally
2sketch vector b to the same scale with its tail at the head of vector a again at proper angle
3 the vector sum s is the vector that extends from
the tail of a to the head of vector b

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كل التوفيق والدعااء .. قواك الله ..