## Elements of Natural Philosophy, Part 1 |

### From inside the book

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Page 1

The circumstances of mere motion , considered without reference to the bodies

by the motion , constitute the subject of a branch of Pure Mathematics , which is ...

The circumstances of mere motion , considered without reference to the bodies

**moved**, or to the forces producing the motion , or to the forces called into actionby the motion , constitute the subject of a branch of Pure Mathematics , which is ...

Page 2

It is useful to consider at the outset various theorems connected with the

geometrical notion of the path described by a

now take up , deferring the consideration of Velocity to a future section , as being

more ...

It is useful to consider at the outset various theorems connected with the

geometrical notion of the path described by a

**moving**point ; and these we shallnow take up , deferring the consideration of Velocity to a future section , as being

more ...

Page 4

all the sides being produced each in the direction in which the

describes it while passing round the figure . This is true whether the polygon be

closed or not . If closed , then , as long as it is not crossed , this sum is four right

angles ...

all the sides being produced each in the direction in which the

**moving**pointdescribes it while passing round the figure . This is true whether the polygon be

closed or not . If closed , then , as long as it is not crossed , this sum is four right

angles ...

Page 6

When the point does not

different successive instants : but we define the ... That there is at every instant a

definite velocity for any

...

When the point does not

**move**uniformly , the velocity is variable , or different atdifferent successive instants : but we define the ... That there is at every instant a

definite velocity for any

**moving**point , is evident to all , and is matter of everyday...

Page 7

The preceding definition of velocity is equally applicable whether the point

in a straight or a curved line ; but , since , in ... Thus , for a train

incline in a N.E. direction , we may have the whole velocity and the steepness of

the ...

The preceding definition of velocity is equally applicable whether the point

**move**in a straight or a curved line ; but , since , in ... Thus , for a train

**moving**up anincline in a N.E. direction , we may have the whole velocity and the steepness of

the ...

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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 experience 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 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