## Elements of Natural Philosophy |

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Page 4

In theory a pulley is simply a smooth body which changes the direction of a

flexible and inextensible Pr cord stretched across part of its surface ; in practice (

to escape as much as possible of the inevitable

In theory a pulley is simply a smooth body which changes the direction of a

flexible and inextensible Pr cord stretched across part of its surface ; in practice (

to escape as much as possible of the inevitable

**friction**) it is a wheel , on part of ... Page 53

... amount of

motion thus accurately provided for . Ex . 3. Let only one of the feet rest in a V

canal , and let another rest in a trihedral hollow in line with the canal , the third

still resting ...

... amount of

**friction**to be overcome , to produce the rectilineal translationalmotion thus accurately provided for . Ex . 3. Let only one of the feet rest in a V

canal , and let another rest in a trihedral hollow in line with the canal , the third

still resting ...

Page 54

clamps two bodies together with perfect firmness in a perfectly definite position ,

without the aid of

practical applications gives very readily and conveniently a more securely firm ...

clamps two bodies together with perfect firmness in a perfectly definite position ,

without the aid of

**friction**( except in the screw , If a screw is used ) ; and in variouspractical applications gives very readily and conveniently a more securely firm ...

Page 59

Force may be of divers kinds , as pressure , or gravity , or

attractive or repulsive actions of electricity , magnetism , etc. 184. The three

elements specifying a force , or the three elements which must be known , before

a clear ...

Force may be of divers kinds , as pressure , or gravity , or

**friction**, or any of theattractive or repulsive actions of electricity , magnetism , etc. 184. The three

elements specifying a force , or the three elements which must be known , before

a clear ...

Page 70

A curling - stone , projected along a horizontal surface of ice , travels equal

distances , except in so far as it is retarded by

air , in successive intervals of time during which the earth turns through equal

angles .

A curling - stone , projected along a horizontal surface of ice , travels equal

distances , except in so far as it is retarded by

**friction**and by the resistance of theair , in successive intervals of time during which the earth turns through equal

angles .

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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