Question

In fig, if $f_1,f_2$ and T are the frictional forces on 2 kg block, 3kg block and tension in the string, respectively, the find their values. Initially before applying the forces, tension in string was zero.

Answer 1

REF. Image.

Force on block 2 kg

$T-1-f_1=2a...\left(1\right)$

Force on block 3 kg

$8-T-b_2=3a...\left(2\right)$

eq (1)+(2)

$T-1-f_1+8-T-f_2=5a$

$7=(f_1+f_2)=5a$

___________________

$T-1-f_1=2a$ a = 0

$T-1-1=0$

$T=2N$

To cease the motion

bock of 3 kg will

provide 6 N friction

& 2 kg block will provide

1 N friction

So, $F_2=6N$

$F_1=1N$