Linear Momentum Formula


Linear Momentum Formula


Linear momentum is the vector quantity and defined as the product of mass of an object, m, and its velocity, v. The letter ‘p’ is applied to express it and used as momentum for short. Please note that the body’s momentum is always in the same direction as its velocity vector. It’s a conserved quantity which means that the total momentum of a system is constant. The units of linear momentum are kg m/s.

The linear momentum formula is given by,

                              P = m v


m = mass

v = velocity

Example 1

Determine the linear momentum of a body whose mass is 10kg moving with a speed of 20m/s.


Given parameters are,

m = 10 kg

v = 20m/s

Linear momentum formula is expressed as,

P = mv

 = 10 x 20

= 200 kgm/s


Example 2

The linear momentum of a body is 40 kg m/s and mass of the object is 5kg. Determine the velocity of the object.


Given parameters are,

m = 5 kg

P = 40 kgm/s

Linear momentum formula is given by,

P = mv

v = P / m

= 40 / 5

  = 8 m/s


Practise This Question

The noble gases have closed-shell electronic configuration and are monoatomic gases used normal conditions. The low boiling points of the lighter noble gases are due to weak dispersion forces between the atoms and the absence of other interatomic interactions.

The direct reaction of xenon with fluorine leads to a series of compounds with oxidation number +2, +4 and +6. XeF4 reacts violently with water to give XeO3. The compounds of xenon exhibit rich stereochemistry and their geometries can be deduced considering the total number of electron pairs in the valence shell.

XeF4 and XeF6 are expected to be

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