One newton is the ____ it takes to change the ____ of a ____ mass by ____ in one second.

To understand the concept of force it is necessary that
one newton is defined through one kg of mass and the change of velocity by a unit of
velocity.

So one Newton is the  force  required to change
the velocity of  one kilogram of mass by  velocity of one meter in one socond
.

But it should be noted that one newton is also a force
required to change velocity 100 gm of mass by change of velocity of 10 meter in one
secon.

Or  for any x kg of mass , if the change in velocity
is a/x m/s in in one second the force is one newton.

Thus
the definition force F = m*a, where m is kilogram and a is acceleration or  change
velocity per second.

So if  m*a = 1 Newton implies m = 1/10
and change velocity = 10m/s in one second.

Or for any value
m = x kg, then  a = 1/x m/s in one second holds.