Page 34 - 4167

rad 0
,0( 34rev ) 2 (   )  123 .
rev
0
Thus , the line OP turns trough 123 and makes an angle
0 0 0
123  90  57 with the horizontal direction.
b)
rad rad rad
   0    t  4  2  s 3  10
s s 2 s

3. DYNAMICS OF MATERIAL POINT

In previous chapter we became acquainted with motion without
considering under what circumstances motion is uniform, or under what cir-

cumstances acceleration occurs. Now an investigation of the cause of motion
has begun. The branch of physics, which deals with causes of motion and
changes in motion is called dynamics. In other words the study of forces
and why objects are in motion.

3.1. Newton's First Law. Inertial Frames of Reference

Isaac Newton ( 1642 – 1727 ) English physicist, mathematician,
astronomer, natural philosopher, alchemist, and theologian, who has
been considered by many to be the greatest and the most influential

scientist who ever lived. His monograph in latin "Philosophia Naturalis
Principia Mathematica"(Mathematical Principles of Natural
Philosophy) , published in

1687, lays the foundations
for most of classical
mechanics. In this work,
Newton described universal

gravitation and the three
laws of motion, which
dominated the scientific

view of the physical
universe for the next three
centuries. Newton showed
Isaac Newton and first page of
that the motions of objects
his"Philosophiæ Naturalis Principia
on Earth and of celestial
Mathematica"

33