5d 
-MOVING FOIICE. 
Tlie Editors regret that this paper was left in an unfinished 
state, owing to tl)e deatii of the ingenious author, and that 
several of the notes referred to, have not been discovered 
amongst his mamicripts, though these have been examined 
with very great care and attention. 
VIIL 
Controversy On the Measure of Moving Force, A/r. Pei'ek Ewart*. i 
the*measiire of IT ^ mechanics, forces are understood to be 
force. mathematical quantities-, caj):ib!e of being measured and 
compared with as much certainty as lines, or surfaces, or any ' 
other mathematical quantities. Respecli' g the principles, , 
however, of tliis mcasuicment and comparison, various doc- | 
trines h«ve been held. A controversy on this subject, after [ 
liaving been long and warmly agitated by learned men in dif- 
ferent parts of Europe, appeals, about seventy years ago, to 
have gradually subsided jf and since that period, it lias been the 
prevailing opinion with mathematicians, that the a*gument re- 
specting the measure of the force of a body in motion, was 
merely a dispute about terms, and that, tliongh the force in 
question may be variously estimated, according to circum- 
stances, it is most naturally and consistently expressed by the L 
The rule that product arising from the mass being multiplied into its velocity. » 
the effect is as^ Although scientific men have, for more than half a century: ■ 
trie mass innl- ° 
tiplied hvsq. been generally satisfied on this question, it must nevertheless be ■ 
great"pi*actical ^’o^slderable ditncultics have occurred in I 
value. the practical application of their measure of force j and, it is ■ 
remarkable, tlut the measure w hich they have rejected, appears i' 
• Manchester Mem. viii. (or IL N. S.) f 
' + Dr R -id.^av’, “ it was dropt rather than ended, to the no small i 
discredit of matiicniatics, wliicli hath always boasted of a degree of |i 
evidence inconsistent wiili delnitcs that can be brought tone issue.” ' 
Essay on Q.iantity. —Philosophical Transactions, 1718. I 
to 
