## Elements of Natural Philosophy, Part 1 |

### From inside the book

Page 4

... body which changes the direction of a flexible and inextensible cord stretched

across part of its surface ; in practice ( to escape as much as possible of the

inevitable

wrapped .

... body which changes the direction of a flexible and inextensible 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 whose circumference the cord iswrapped .

Page 54

Force is wholly expended in the Action it produces ; and the body , after the force

ceases to act , retains by its inertia the direction of motion and the velocity which

were given to it . Force may be of divers kind , as pressure , or gravity , or

Force is wholly expended in the Action it produces ; and the body , after the force

ceases to act , retains by its inertia the direction of motion and the velocity which

were given to it . Force may be of divers kind , as pressure , or gravity , or

**friction**... Page 65

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 .

Page 69

... resistance be measured by the velocities of its several parts into their several

forces , whether these arise from

action and reaction , in all combinations of machines , will be equal and opposite

.

... resistance be measured by the velocities of its several parts into their several

forces , whether these arise from

**friction**, cohesion , weight , or acceleration ; --action and reaction , in all combinations of machines , will be equal and opposite

.

Page 73

But in Newton's day , and long afterwards , it was supposed that work was

absolulely lost by

recent authoritative treatises . But we must defer the examination of this point till

we ...

But in Newton's day , and long afterwards , it was supposed that work was

absolulely lost by

**friction**; and , indeed , this statement is still to be found even inrecent authoritative treatises . But we must defer the examination of this point till

we ...

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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