Wednesday 17 April 2013

Momentum

Momentum can be described as "mass in motion". Therefore it is proportional to  both the mass of the object and its velocity.  Put simply:

Where p is momentum, m is mass and v is velocity.  Momentum is a vector quantity and has the units Newton seconds.  Momentum can also be defined with a slight alteration to Newton's 2nd Law.

Take:

The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma

alter to:


The rate of change of momentum is directly proportional to the magnitude of the net force and the direction of the net force.

F = ma  can be rewritten as:



which can be rewritten as:

Impulse is known as change in momentum.  Impulse can also be written as below:
From this point, we will move onto conservation of momentum. 


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