Newton's first law states that an object will keep doing what it
is doing if left alone, in other words - The natural state of an
object is static - unchanging - motion. Newton's second law
clarifies the first. Acceleration, or any change in motion, is
an unnatural state for an arbitrary object left to its laurels,
however it is a state that clearly exists all around us. Newton
defines the "thing" that forces an object to change its state of
being - a force. In this most rigorous sense, a force is defined
to be that which causes a change in motion. The observation of a
change in momentum necessitates that there is some force driving
that change, so in this sense the two are equivalent (there is
an equals sign there after all) - wherever you see a (net) force
you will see an acceleration, wherever you see an acceleration
you will find a force responsible for it. However, going back to
the first law, acceleration is a change in the (kinetic) state
of an object, an objects natural tendency is to statically maint