# Momentum:Definition,unit,formula and Uses in real life:Class 9 CBSE

The word momentum you would have heard many times in the sports news or commentary ,as an example the cricket team chennai super king(an IPL team) has gained its momentum or in a day to day time if a students progress continuously then we say ,this student has got a momentum in his or her intelligence. In all these example everywhere there is a move of an individual or entity ,therefore momentum involves a move(velocity) and mass(individual or entity),scientifically we define momentum as a product of the mass and the velocity.

## Momentum: Definition,unit,formula and Uses in real life:Class 9 CBSE

Table of content

(i) | Definition of momentum |

(ii) | Formula of momentum |

(iii) | Unit of the momentum |

(iv) | Conservation of the momentum |

(v) | Application of the momentum |

(vi) | Questions based on the momentum |

**Definition of momentum:**

Momentum is the product of velocity and the mass, velocity is a vector quantity and mass is the scaler quantity therefore Momentum is the vector quantity.Momentum is represented by small case English letter p or large case English letter P.

**Formula of momentum:**

Formula for Momentum is as follows

P = mv

Where P is the Momentum,v is the velocity of a moving object and m is the mass of the object

**Unit of the momentum:**

SI Unit of the momentum = SI unit of the mass× SI unit of the velocity

Unit of the momentum = Kilogram × Meter/Second =Kg.ms^{-1}

**Conservation of the momentum:**

The initial momentum of a system is equal to the final momentum or in other words,the net momentum of a system is zero.

Let in a system two objects colloids to each other which are of the mass m_{1} and m_{2 }and are moving with velocities u_{1} and u_{2 }respectively and after collission their velocities changes to v_{1} and v_{2 }

Let initial

Initial momentum =Final momentum

P_{1} =P_{2}

m_{1} u_{1} +m_{2} u_{2} = m_{1} v_{1} +m_{2} v_{2}

Or

m_{1} u_{1} +m_{2} u_{2} – m_{1} v_{1} -m_{2} v_{2} =0

**Application of the momentum in real life**

When a ball thrown by us on the wall ,it colloides with the wall with a particular velocity it is reflected back by the wall by a same velocity that follows conservation of the momentum.

A cricketer catch the ball by moving his both hands in back ward direction for maintaining the conservation of the momentum so that ball could not be bounces from his hand.

** Questions based on the momentum:**

**Click here :Questions based on the momentum**

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