Question
State the laws of limiting friction.
Solution
Laws of limiting friction:
(i) The force of limiting friction depends upon the nature of surfaces in contact and-acts tangentially to the interface between the two surfaces.
(ii) The force of limiting friction between two surfaces in contact is independent of the area of contact.
(iii) Limiting friction is directly proportional to the magnitude of normal reaction N between two surfaces in contact,
i.e.
where n is constant of proportionality and known as coefficient of friction.
(iv)The direction of force of friction is always opposite to the direction in which the body moves or tends to move.
