## Elements of Natural Philosophy, Volume 1 |

### From inside the book

Results 1-5 of 47

Page 3

As two successive positions of it contain the second side of the polygon above

mentioned , it is evident that the osculating plane

next by revolving about the tangent to the curve . 13 . Thus , as we proceed along

...

As two successive positions of it contain the second side of the polygon above

mentioned , it is evident that the osculating plane

**passes**from one position to thenext by revolving about the tangent to the curve . 13 . Thus , as we proceed along

...

Page 4

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

describes it while

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 point

describes it while

**passing**round the figure . This is true whether the polygon beclosed or not . If closed , then , as long as it is not crossed , this sum is four right

angles ...

Page 11

( c ) If the components of the velocity parallel to each axis be equimultiples of the

distances from the other axis , the path is a straight line

origin . ( d ) When the velocity is uniform , but in a direction revolving uniformly in

a ...

( c ) If the components of the velocity parallel to each axis be equimultiples of the

distances from the other axis , the path is a straight line

**passing**through theorigin . ( d ) When the velocity is uniform , but in a direction revolving uniformly in

a ...

Page 12

When the acceleration is directed to a fixed point , the path is in a plane

through that point ; and in this plane the areas traced out by the radius - vector

are proportional to the times employed . This includes the case of a satellite or ...

When the acceleration is directed to a fixed point , the path is in a plane

**passing**through that point ; and in this plane the areas traced out by the radius - vector

are proportional to the times employed . This includes the case of a satellite or ...

Page 13

... of the components always

This is the case of a motion in which the acceleration is directed to a fixed point ,

and we thus prove the second theorem of $ 45 , that in the case supposed the

areas ...

... of the components always

**passes**through the point , its moment vanishes .This is the case of a motion in which the acceleration is directed to a fixed point ,

and we thus prove the second theorem of $ 45 , that in the case supposed the

areas ...

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### Common terms and phrases

acceleration according acting action amount angle angular applied attraction axes axis becomes body called centre centre of inertia circle cloth 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 period 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

### Popular passages

Page 161 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.

Page 9 - Persius. The Satires. With a Translation and Commentary. By John Conington, MA, late Corpus Professor of Latin in the University of Oxford. Edited by H. Nettleship, MA Second Edition.

Page 65 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it is compelled by force to change that state.

Page 10 - Crown 8vo. cloth, 7s. 6d. A Treatise on Electricity and Magnetism. By J. Clerk Maxwell, MA, FRS, Professor of Experimental Physics in the University of Cambridge.

Page 28 - Fourier's theorem is not only one of the most beautiful results of modern analysis, but may be said to furnish an indispensable instrument in the treatment of nearly every recondite question in modern physics.

Page 161 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.

Page 66 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.

Page 68 - To every action there is always an equal and contrary reaction; or, the mutual actions of any two bodies are always equal and oppositely directed in the same straight line.

Page 9 - An Elementary Treatise on Quaternions. By PG TAIT, MA, Professor of Natural Philosophy in the University of Edinburgh ; formerly Fellow of St Peter's College, Cambridge. Second Edition. Demy 8vo. 14*.

Page 130 - UNTIL we know thoroughly the nature of matter and the forces which produce its motions, it will be utterly impossible to submit to mathematical reasoning the exact conditions of any physical question.