A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 64
etrically in a following para-graph (50, e). If AE is taken on the vertical line equal to —, and EGE be drawn horizontally, this line will be the direc-trix; and if from A on the line AF (drawn so that the , u2angle EAD = DAF) we take AF = —, the point i^is the focus of the parabola. The vertical… … Fig. 23. trix are at distances equal to — from A. This figure shows well, as doesalso Fig. 21, what is meant by thestatement in (27), that in uniformly #».,accelerated motion the space is pro-portional to the square of the time. Here, if the suc-cessive intervals of time are equal, AD : AD : AD :…
Mechanics
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