Lever scales. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Lever scales. Physical experiments

Entertaining experiments in physics

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Remember how you were weighed during a medical examination. Standing on the platform of the scales, you played the role of the "behemoth" from our previous experience. And the role of the bird was played by a weight, which was moved along the balance beam by a nurse. Of course, these scales are more complex than in our experience. Two levers are hidden in them, located one after the other. But the basic principle is the same. The weight on the yoke moved far, and the movement of the balance platform was barely noticeable.

Very similar in design and large commodity, the so-called decimal scales. They can be seen in warehouses and in the luggage compartments of railway stations. At the post office, parcels are also weighed on a balance scale. Household, kitchen scales are often produced spring-loaded, with an arrow and a dial. But sometimes in the kitchen you can see lever scales.

You can also make a kitchen scale. A ladle will serve as a lever, and at the same time already a cup of these scales, a skimmer will serve as a movable weight, the teeth of the fork will be the fulcrum for the lever here. They lie on the heads of two nails stuck into the cork. The other end of the fork is inserted into the hook of the ladle along with a piece of cork so that it does not fall out.

Draw a horizontal line on the wall. When weighing the load, move the skimmer until the ladle is parallel to this line.

lever scales

Divisions are applied on the yoke of postal and medical scales. And on the handle of the ladle they will also need to be applied. First, mark the position of the skimmer on the ladle without weight. Then put a load of 0,5 kg into the bucket of the ladle and move the skimmer until you again establish balance. Note this position of the skimmer. Divide the gap between the two marks along the ruler into five equal parts and put down the numbers next to the divisions: 0; 0,1 kg; 0,2 kg and so on up to 0,5 kg. Scales are ready!

Author: Galpershtein L.Ya.

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