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2014-10-24T23:17:06+05:30

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In general we say inertia is represented by mass.  Mass is a scalar. It does not have a specific direction and does not follow law of addition of vectors.

Force is a vector quantity. It has a magnitude, it has a direction as that of the change in linear momentum. Force follows the vector addition law (parallelogram law of addition).

Linear Momentum is a vector quantity. It has a magnitude, it has a direction as that of the linear velocity. It follows the parallelogram law of vector addition.

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Often inertia means the resistance to the change in state of an object.  Mass is the quantity that resists a body from changing its state from rest to motion.  That is why it is often called  the inertial mass.   Mass is a scalar quantity.  It does not have a unique direction and it does not follow the laws of vector addition.

Also, when a body is in motion, inertia of motion is represented by its momentum rather than its mass.  In that case the inertial is a vector, as momentum has a direction and follows the vector addition law.


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