The study of mechanics plays a central role in physics for a whole
variety of reasons. It was one of the earliest of the quantitative
sciences, and had immediate practical applications. These ranged from
the study of the motion of projectiles in warfare to the motion of the
planets, predicting the seasons, eclipses, etc. At the present time,
even though superseded on the very small scale by quantum theory and on
the very large scale by the theory of relativity, the mechanics of
Newton is perfectly adequate for treating a wide spectrum of problems
from the - '"etic theory of gases to the motion of space vehicles.
Furthermore, the science of mechanics is regarded by many as the epitome
of a good scientific theory and for this reason is studied by
philosophers and social scientists alike as an exemplar of the
'scientific method'. We shall commence in Chapter 1 with a brief
historical outline of the development of mechanics, mentioning the names
and dates of the main participants and summarizing their contributions.
Preface vii Chapter 1 Newton's laws 1. 1 Historical introduction
Primitive ideas about mechanics were exemplified by the state- ments of
Aristotle (384-322 Be), who asserted that a force was necessary to
maintain motion. Furthermore, he believed that there were different laws
for heavenly and earthly bodies.