Strength depending on the shape. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Strength depending on the shape. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Mechanics - the science of movement and the forces that change this movement - is the main science of an engineer - a builder of machines, buildings, hydraulic structures.

More than once you have noticed that iron beams of various shapes or, as they say, profiles are used in the construction business. There are beams in the form of the letters "T", "P" and other shapes. This is not done by accident. Beams of such a section withstand loads many times better, resist bending more easily than beams of the same cross-sectional area, but of a rectangular shape.

Check it out.

Take a long strip of thin paper. Put it between two supports. The strip will bend even from its own weight:

Strength depending on the shape

Give the strip the shape of a square or the shape of the letter "P". You will see that now the strip will withstand a significant load, for example a box of matches:

Strength depending on the shape

By bending the same strip in the form of an arc, you will see that it can also withstand a small load:

Strength depending on the shape

Take the empty matchbox; each wall of it is made of very thin and individually fragile plates.

Strength depending on the shape

However, if you put a board on top of it, and put heavy weights around the edges, balancing them, you will see that the box can withstand a load even a thousand times greater than its own weight.

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