Living shadow. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Living shadow. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

It is not the object that we want to depict that is placed on the table, but its wire frame: for example, a small model of a stool made of wire. This model is lit by a low-lying bulb so that its elongated shadow falls on a piece of white paper. The shadow of the wire stool is outlined in pencil. It turns out a very distorted image, in which it is difficult to recognize nature. Then this drawing must be carefully drawn, shaded, all the shadows and halftones that a real stool could have should be conveyed.

If you look at the resulting drawing of a stool “flattened” on paper from the same point where the light bulb was located that illuminated the model, you will suddenly see that the drawing has changed: the stool in front of you stands “as if alive”, so voluminous that you even want to touch it hand.

Animated shadow

In the described way, you can create various three-dimensional drawings. For the first time, choose something easier, like a cube. Make a small cube out of wire, illuminate it with a side light, circle the shadow with a pencil, and then shade the drawing well, work out the shadows with diluted black paint. Get the cube to look like it's made of cardboard. True, he will have the appearance of a figure flattened, as if crushed by a powerful press, but it must be drawn carefully.

Put the drawing on the place where the cube model stood, and look at it from the same point from which it was lit. You need to view the image through a vertically placed cardboard with a small hole for the eye.

But if you can't do it all yourself, here is the finished drawing of the "flattened" stool, which was mentioned above. You just need to make a device for viewing it.

Take a piece of cardboard, at a height of 12 centimeters, make a hole in it the size of a penny coin. Make an oblique cut at the bottom and, bending the resulting corner as a support, place the cardboard on the table. Place the picture book at a distance of 24 centimeters from the cardboard. Place a small object on the drawing of the seat of the stool: a ball, a nut or a thimble. Light the drawing well. The shadow of the placed object should fall only on the stool and in the direction where the drawn shadow of the stool itself is located. When you look into the hole in our screen, the line of sight should pass through the hole in the cardboard and the crosses in the picture.

Animated shadow

Look into the opening of the cardboard screen, and you will see that the stool stands really "like alive."

Animated shadow

In this way, you can create more complex drawings of individual objects and even landscapes. You can make interesting three-dimensional panoramas. At the same time, real objects should also be widely used, as you did when considering the drawing of a stool.

Author: Rabiza F.V.

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