Strobe. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Strobe. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

The spokes of a rapidly spinning wheel give the picture of a solid rim filled inside. If you rotate a smoldering splinter, you will see a fiery ring. A film strip with a sufficiently fast feed of individual still pictures (frames) creates the impression of movement. The fact is that our eye retains a visual impression for about 0,1 fractions of a second. If the movements are fast, then visual impressions merge with one another. The eye, as it were, still sees the disappeared image, although it has already been replaced by another. A stroboscope is a simple homemade product that gives some idea of the principle of obtaining moving figures from individual drawings.

From thick cardboard or plywood, cut a circle with a diameter of 125 mm, and from thick paper (black) - a strip 410 mm long and 80 mm wide. For ease of gluing, cut cloves on one side of the strip. At equal distances from each other, make twelve slits in the strip, 5 mm wide and 30 mm high. If the paper is white, color it black. When it dries, stick it on a circle - you will get a round box.

Strobe

Make a handle out of wood and drive a nail without a hat into it. Make a hole for the nail in the center of the bottom of the box. Put a sleeve made of tin or thick paper 20-30 mm high on the hole. The box, mounted on a carnation, should rotate freely.

Make a strip of white thick paper 40 mm high. The length of the strip should be equal to the inner circumference of the box. On the strip, draw 13 figures with successive changes in movements. Place the pattern strip in the box as shown and rotate the box by the handle around the axis of the stud. Look into the slot; it will seem to you that the figure has come into motion.

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The semi-autonomous driving system will be optionally available to all models of the Cadillac brand starting in 2016. The automaker did not name the cost of the additional feature. A safety package that includes adaptive cruise control and automatic braking and forward collision warning systems is currently being offered to Cadillac customers for about $2400.

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