What is Physics?

In general, we can say that physics studies the material objects. In particular, it studies mass,
energy, force, particles and the interactions between them. Therefore, it encompasses the study
of the universe from the largest galaxies to the smallest subatomic particles. Its area of study
also includes light and radiation, sound and color, planets and other celestial objects, galaxies
and constellations. Different branches of science are classified based upon the primary areas of
study. For example, chemistry studies the chemical compositions of material objects, their
activities and interactions with each other, whereas biology is the study of organisms. We also
have branches of science that focus on specific aspects of organisms such as their nervous
system. Neuroscience, for example, is the study of nervous systems, brain, neurons and so on.

Although science has many branches, physics may be considered as the most fundamental of
all because even the complicated and complex things that other sciences study could be broken
down to more fundamental constituents such as atoms and subatomic particles, which are the
fields of study of physics. Moreover, all the changes that we see in the universe are due to one
or more of the four forces, which again are what physics studies.