. The principles of physics. motion is said to, be rectilinear. But if itsmotion constantly changes in direction, at every point, asis the case of every particle in a rotating wheel except pointson its axis, its motion is said to be curvilinear. It isevident that the direction of a motion in a curvilinear pathcan be given only for some specified point, and, further-more, that direction can be represented only by a straightline, for a curved line is a linei composed of an infinitenumber of directions. Let A (Fig. 14) represent a bodymounted on a cardboard sector S S which is rotated about
. The principles of physics. motion is said to, be rectilinear. But if itsmotion constantly changes in direction, at every point, asis the case of every particle in a rotating wheel except pointson its axis, its motion is said to be curvilinear. It isevident that the direction of a motion in a curvilinear pathcan be given only for some specified point, and, further-more, that direction can be represented only by a straightline, for a curved line is a linei composed of an infinitenumber of directions. Let A (Fig. 14) represent a bodymounted on a cardboard sector S S which is rotated about COMPOSITION OF giRCULAE MOTION. 25 the axis C in the direction indicabed by the arro-w. will move in the circular path ADEF. The straightline A B will indicate the direction of the motion at everypoint, but it will be seen that this line changes its directionconstantly. At whatever point the body may be at anyinstant, the line A B, which shows the direction of the motion,is always tangent to the curve at that
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
