Force and energy are distinct concepts, but closely related. Once
we understand what each term means and what they imply, we will find
that there are physical situations that are easy to explain in terms of
the forces that are acting (but harder to explain in terms of energy),
and there are situations that are easy to explain in terms of the transfers
of energy that are taking place (but harder to explain in terms of forces).
So we shall develop the two concepts at the same time.
Force and energy are distinct concepts, but closely related. Once
we understand what each term means and what they imply, we will find
that there are physical situations that are easy to explain in terms of
the forces that are acting (but harder to explain in terms of energy),
and there are situations that are easy to explain in terms of the transfers
of energy that are taking place (but harder to explain in terms of forces).
So we shall develop the two concepts at the same time.