## Elements of Natural Philosophy, Volume 1 |

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Page 1

Force is recognized as acting in two ways : I ° so as to compel rest or to prevent

change of

therefore , is divided into two parts , which are conveniently called STATICS and

...

Force is recognized as acting in two ways : I ° so as to compel rest or to prevent

change of

**motion**, and 2 ° so as to produce or to change**motion**. Dynamics ,therefore , is divided into two parts , which are conveniently called STATICS and

...

Page 2

which will form , as it were , the Geometry of the subject , embracing what can be

observed or concluded with regard to actual

sought . In this category we shall first take up the free

which will form , as it were , the Geometry of the subject , embracing what can be

observed or concluded with regard to actual

**motions**, as long as the cause is notsought . In this category we shall first take up the free

**motion**of a point , then the ... Page 3

... turned as we pass from one extremity to the other . The average curvature of

any portion is its whole curvature divided by its length . Suppose a line , drawn

through any fixed point , to turn so as always to be parallel to the direction of

... turned as we pass from one extremity to the other . The average curvature of

any portion is its whole curvature divided by its length . Suppose a line , drawn

through any fixed point , to turn so as always to be parallel to the direction of

**motion**... Page 5

Similar considerations enable us to determine the relative

other systems of pulleys and cords as long as all the free parts of the cords are

parallel . Of course , if a pulley be fixed , the

cord ...

Similar considerations enable us to determine the relative

**motions**of all parts ofother systems of pulleys and cords as long as all the free parts of the cords are

parallel . Of course , if a pulley be fixed , the

**motion**of a point of one end of thecord ...

Page 6

The rate of

Velocity . It is greater or less as the space passed over in a given time is greater

or less : and it may be uniform , i.e. the same at every instant ; or it may be

variable .

The rate of

**motion**of a point , or its rate of change of position , is called itsVelocity . It is greater or less as the space passed over in a given time is greater

or less : and it may be uniform , i.e. the same at every instant ; or it may be

variable .

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### Common terms and phrases

acceleration according acting action amount angle angular applied attraction axes axis body called centre centre of inertia circle component condition consider constant corresponding couple course curvature curve denote density described determined direction displacement distance divided effect elastic elements energy equal equations equilibrium evidently expression figure fixed fluid force friction give given gravity harmonic Hence important increase infinitely small instant interval kinetic length less mass matter mean measured method motion moving natural normal observation opposite parallel particle passing path perpendicular plane portion position potential practical pressure principle problem produce projection proportional quantity radius reference relative remain remarkable respectively rest resultant right angles rigid rotation round sides simple solid space spherical square straight strain stress suppose surface theory turned uniform unit velocity weight whole wire