Question

Find the potential energy of a system of four particles.Each of mass "m" place at the vertices of a square of side " l

Answer 1

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Dear Student,
Please find below the solution to the asked query 6:
 

The linear momentum of a body is defined as the product of its mass and velocity and is give by:    p⃗  = mv⃗ 

If F is the net force acting on the object then,
∑F⃗  = ma⃗  = m dv⃗ dt = dp⃗ dt
Or, the rate of change of the linear momentum is equal to the amount of force acting on the body. 

Let us suppose that p is the total linear momentum of a system of particles which is given as the vector sum of the momenta of the individual particles.Then,

p⃗  = ∑ni  pi→
or, it can be rewritten as:

p⃗ = ∑ni mivi −→=Mvcom

Hence,
We can say that the total linear momentum of a system of particles is equal to the product of mass of the whole system and the velocity of the centre of mass.

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