## Elements of Natural Philosophy |

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Page 5

Similar considerations enable us to determine the

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

parallel . Of course , if a pulley be faced , the motion of a point of one end of 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 faced , the motion of a point of one end of the ...

Page 17

All motion that we are , or can be , acquainted with , is

calculate from astronomical data for any instant athe direction in which , and the

velocity with which , we are moving on account of the earth's diurnal rotation .

All motion that we are , or can be , acquainted with , is

**Relative**merely . We cancalculate from astronomical data for any instant athe direction in which , and the

velocity with which , we are moving on account of the earth's diurnal rotation .

Page 18

of the sun relatively to the so - called fixed stars ; but , even if all these elements

were accurately known , it could not be said that we had attained any idea of an

absolute velocity ; for it is only the sun's

of the sun relatively to the so - called fixed stars ; but , even if all these elements

were accurately known , it could not be said that we had attained any idea of an

absolute velocity ; for it is only the sun's

**relative**motion among the stars that we ... Page 19

Then , as the form of the

direction of the line joining the two points at any instant , it is obvious that these

will be the same for A with regard to B , as for B with regard to A , saving only the

...

Then , as the form of the

**relative**path depends only upon the length and G ' A Bdirection of the line joining the two points at any instant , it is obvious that these

will be the same for A with regard to B , as for B with regard to A , saving only the

...

Page 22

Let and Q be the uniformly moving points in the

describe a parallelogram sece ; and through S draw SR perpendicular to BA '

produced . We have PR = CP ( being projections of the equal and parallel lines

Q's ...

Let and Q be the uniformly moving points in the

**relative**B ! circles . Once and cedescribe a parallelogram sece ; and through S draw SR perpendicular to BA '

produced . We have PR = CP ( being projections of the equal and parallel lines

Q's ...

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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 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