Cau 1:

a) Thiet Lap Gia Toc phap tuyen

xet 1 cd chuyen dong tren duonf tron tam O tai thoi diem t chat diem o vi tri M, vec'to V=MA , tai thoi diem t' = t +deltat o vi tri M', V'= M'A' Ki' hieu( Delta= d)

co' a = lim dv/dt ve MB=V' lay diem C/ Mc =V' tren phuong AM

dV= V'-V=MB-MA=AB=AC+CB

=> a= lim (AC+CB)/dt

dat an = lim CB/dt

co' goc' CMB = goc' MOB = d0

xet' tam giac MCB = (pi-d0)/2

khi t' -> t suy ra d0->0 suy ra CB co phuong huong vao tam O

an= lim CB/dt= lim (2MC.sin(d0/2))/dt= lim(V'.d0)/dt

an = lim V'.dS/(dt.R)= Lim (V'/R)( lim dS/dt= V.V/R= V^2/R

b) PT chuyen dong va quy dao cung chuywen dong tron

x= R.cos(wt+fi)

y= R.sin(wt+fi)

pt quy dao

X^2+ Y^2=R^2