**Momentum** of a body is the quantity of motion poses by the body.

It is defined to be the product of its mass m and velocity v. It is denoted by p.

SI unit of **momentum** is kgm/s. In CGS system gcm/s. It’s dimensional formula is **[MLT⁻¹]**.

#### Variation Of Momentum

**Case-I:** Let two objects each of mass m are moving with different velocities V₁ and V₂ with V₁>V₂, then

Thus, the **momenta** of bodies having equal masses are proportional to their velocities.

**Case-II:** Let two object of same velocity and different masses, then

Thus, the **momentum** of bodies having equal velocities are proportional to their masses.

**Case-III:** Let two objects having equal linear **momenta**.

Thus, P₁ = P₂ = P

⇒ m₁v₁ = m₂v₂

Thus, the velocities of bodies having equal linear **momenta** are inversely proportional to their masses.

**NCERT Class 11 Physics Book PDF Free Download**

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##### NCERT Class 11 Physics Hand Written Notes Chapter-Wise

**Chapter-1 (Physical World) PDF Free Download**

**Chapter-2 (Units and Measurement) PDF Free Download**

**Chapter-3 (Motion In A Straight Line) PDF Free Download**

**Chapter-4 (Motion In A Plane) PDF Free Download**

**Chapter-5 (Laws Of Motion) PDF Free Download**