Sparrow on a branch. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Sparrow on a branch. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

This is another interesting toy with a stable balance. Shape the body and head of the sparrow from plasticine. A beautiful beak will come from an acacia thorn, blackthorn or other thorny plant. If there is no suitable spike, you can simply sharpen the stick and press it into the plasticine. Sparrow eyes - nail heads, beads or match heads. Stick some feathers instead of a tail. Legs - from matches.

At the lower end of the wire stuck into the body of the sparrow behind the legs, strengthen the counterweight. It can be a plasticine ball, a small potato, and finally, just a nut hung on a hook. The wire should enter the body of the sparrow behind the legs.

With a heavy enough load, the sparrow will sit perfectly on the finger. And if you plant it on a branch in the garden, it will sway as if alive. You can also plant it on the Christmas tree. Well, what will happen if the load is lighter than a sparrow? Will our bird sit or fall?

When we put the pencil on the point, we found out that the balance will be stable if the main gravity is below the fulcrum. Now the main weight - the sparrow's body - is above the fulcrum. So the poor fellow will fall?

Don't rush to answer. Check with experience first. Move the potato or plasticine ball up and down the wire. Trying to balance the sparrow with different positions of the light weight, you will see that the bird sits steadily when the weight is moved far down.

And if the load is high, under the very finger, then the sparrow will tip over. It turns out that the stability of equilibrium depends not only on the weight, but also on the position of the load.

To better understand this, you can do another experiment with a plasticine sparrow. Try to balance it by supporting the wire with the edge of the ruler. You will see that the higher the counterweight is raised, the closer to the sparrow is the place of the wire on which it is balanced. This place is called the center of gravity of the entire structure.

sparrow on a branch

Sparing no time for trials, you will see that the sparrow sits on the finger as long as the center of gravity remains below the fulcrum. And as soon as it gets higher, the sparrow will begin to fall.

So, it is not necessary that the main gravity be at the bottom. It is important that the center of gravity is below the fulcrum. Then, if the balance is disturbed, the center of gravity will rise. And raising the center of gravity is the same as lifting the whole load together: the sparrow, the counterweight, and the wire. Of course, the center of gravity will always pull down and balance will be restored.

Author: Galpershtein L.Ya.

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Texas Instruments has released new software for the CC1310 that turns the chip into a complete radio modem controlled by AT commands. The CC1310 system on a chip consists of a Cortex-M3 microcontroller and a Sub1GHz radio, which allows you to create complete devices with wireless data transmission on a chip. However, in many cases it is required to add a radio channel to an already existing system with its own microcontroller. The new firmware (firmware) allows to solve this problem in a short time and with a minimum of engineering effort.

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