You will need

- - flat figure;
- pencil;
- - the range;
- - statoconia pencil;
- - threads;
- needle.

Instruction

1

Try to determine the center

*of gravity*of a flat**shape**empirically. Statoconia take a new pencil, place it vertically. On top put a flat figure. Note on the figure the point at which it is held steadily on the pencil. This will be the center*of gravity*of your**shape**. Instead of a pencil you can use just pulled up the index finger. But it's more complicated because it is necessary to ensure that the finger was standing straight, not swaying and trembling.2

To demonstrate that the obtained point is the center of mass, do it in a needle hole. Through the opening the thread, at one end tie a knot so that the thread does not pop out. Holding on to the other end of the string, hang the body on it. If the center

*of gravity*is defined correctly, the figure will be placed exactly parallel to the floor. Her side will not be shaken.3

Locate the center

*of gravity***of the shape**of a geometric path. If you are given a triangle, construct the medians. These segments connect the vertices of the triangle with the midpoint of the opposite side. The point of intersection of the medians will be the**center**of mass of the triangle. To find the middle point of the side, you can even fold the figure in half, but keep in mind that in this case violated the uniformity**of the figure**.4

If you have given a parallelogram, draw it diagonally. They intersect in the center of mass. Special cases of parallelograms: rectangle, square, rhombus. The principle of the geometric search of the centre

*of gravity*of such figures is similar.5

Compare the results obtained geometric and empirically. Make conclusions about the experiment. Small errors are the norm. They are explained by imperfection

**of the figure**, the inaccuracy of the devices, human factors (small flaws in the work, the imperfection of the human eye, etc.).