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3.3 Law of Conservation of momentum
From eqn. (6)
 
Equation (7) is called the Law of conservation of momentum. The
total linear momentum of a system on which no external force acts
remains conserved, if no external force acts on it.
Solved Problem
Find the minimum force with which an object of mass 2 kg should be pressed against a rough vertical wall if the coefficient of static riction between the object and the wall is 0.5. If a force greater than this minimum force is exerted will the object rise up along the wall ? Explain. (g = 9.8
m/s2)
Solution
P : Applied force.
f : Limiting (Maximum) force of static friction.
R : Normal Reaction by the wall on the object.
For Equilibrium, f = Mg & R = P
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