JEE Main & Advanced Physics NLM, Friction, Circular Motion Linear Momentum

Linear Momentum

Category : JEE Main & Advanced

(1) Linear momentum of a body is the quantity of motion contained in the body.

(2) It is measured in terms of the force required to stop the body in unit time.

(3) It is also measured as the product of the mass of the body and its velocity i.e., Momentum = mass × velocity.

If a body of mass m  is moving with velocity $\overrightarrow{v\,}$ then its linear momentum $\overrightarrow{p}$is given by $\overrightarrow{p}=m\,\overrightarrow{v\,}$

(4) It is a vector quantity and it?s direction is the same as the direction of velocity of the body.

(5) Units : kg-m/sec [S.I.],  g-cm/sec [C.G.S.]

(6) Dimension : $[ML{{T}^{-1}}]$

(7) If two objects of different masses have same momentum, the lighter body possesses greater velocity.

$\therefore$ $p={{m}_{1}}{{v}_{1}}$$={{m}_{2}}{{v}_{2}}$= constant

$\frac{{{v}_{1}}}{{{v}_{2}}}=\frac{{{m}_{2}}}{{{m}_{1}}}$

i.e.  $v\propto \frac{1}{m}$                  [As p is constant]

(8) For a given body $p\,\propto v$

(9) For different bodies moving with same velocities $p\,\propto \,m$

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