Question

In car breaking positive friction or negative friction ?

Answer 1

According to me fiction is always Negative ....hope it helps

Answer 2

Work done by friction when car is breaking is a negative fiction

We know that

W=F×s

And F=ma

Accleration(a) Will be negative as car is getting slow

So,

F=m (-a)

Hence,

W=m (-a)s

W= -mas

Hence it is negative