i. The frictional Force is always Tangential to the contact surface & acts in direction opposite to the impending motion.

ii. The value of frictional force F increases as the applied disturbing force increases till it reaches the limiting value $F_{MAX}$. At this limiting stage the body is on verge of motion.

iii. The ratio of limiting frictional force $F_{MAX}$ & the normal reaction N is constant and it is referred to as coefficient of static friction $(µS)$. The frictional force F generated between the two rubbing surfaces is independent of the area of contact.