| 摘要 |
<p>In an apparatus for demonstration of a motion development in time on two parallel straight lines arrays (2, 3) of uniformly and in both arrays equally spaced photoresistors and light-emitting diodes, respectively, are placed. Rails (12), whereon an object (1) moves, are placed parallel to the arrays (2, 3). A laser (11), which in any moment of the motion of the object (1) illuminates one or two adjacent photoresistors (2i), is fastened to the object (1). Each photoresistor (2i) in a thereto pertinent line of elements is connected to a first input of a logic AND gate, to whose second input clock pulses are conducted and whose output is connected through a logic flip-flop element to the light-emitting diode (3i). The apparatus of the invention for demonstration of a motion development in time is remarkable in that it conveys a visual demonstration of path sections covered by the object in equal time intervals and thereby makes possible a picture of whether the motion in particular moments is steady or accelerated.</p> |
