It is an important factor in the field of Engineering Science, which may be defined as an agent which produces or tends to produce, destroy or tends to destroy the motion. According to

__, the applied force or impressed force is directly proportional to the rate of change of momentum. We know that,__*Newton's second law of motion***Momentum = Mass x Velocity**

Where,

m = Mass of the body

u = Initial velocity of the body

v = Final velocity of the body

a = Constant acceleration

t = Time required to change the velocity from u to v.

So, Change of momentum = mv-mu

and the rate of change of momentum, = (mv-mu)/t = m.(v-u)/t = m.a

So, We can write Force,

**F Î± m.a**

**F = k ma**

Where, k is a constant of proportionality

For the sake of convenience, the unit of force adopted is such that it produces a unit acceleration to a body of unit mass.

**F = ma**

**Force = Mass X Acceleration**
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