## Elements of Natural Philosophy |

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Page 1

X Force is recognized as acting in two ways : Io so as to compel rest or to prevent

change of

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

X Force is recognized as acting in two ways : Io 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

In this category we shall first take up the free

a point attached to an inextensible cord , then the

rigid systems — and finally , the deformations of solid and fluid masses . 7 .

In this category we shall first take up the free

**motion**of a point , then the**motion**ofa point attached to an inextensible cord , then the

**motions**and displacements ofrigid systems — and finally , the deformations of solid and fluid masses . 7 .

Page 3

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

through ...

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**of a point describing the curve : the anglethrough ...

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

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 the ... 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 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 period perpendicular plane portion position potential practical pressure principle produce projection proportional quantity radius reference relative remain remarkable resistance respectively rest resultant right angles rigid rotation round sides simple solid space spherical square straight strain stress suppose surface theory turned uniform unit velocity vertical weight whole wire