Answer:
Consider an object of
mass m moving along a straight line with an initial velocity u (say). It is
uniformly accelerated to velocity u in time t by the application of a constant
force F in time t.
Then, initial
momentum of the object = mu
Final momentum of
the object = mu
Change in momentum = mv-mu
The rate of change
in momentum
According to
Newton's second law of motion, we have
Here, 
the rate of change of velocity.
=
acceleration
k = a
constant of proportionality
Putting
F becomes 1N.
So, 1 N = k
x 1 kg x 1 
:. k=l
from
equation (1), we have
F = ma
This
represents the second law of motion.
Thus, the
second law of motion gives a method to measure the force acting on an object as
a product of its mass and acceleration.
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