Locating the center of mass There are several methods for locating the center of mass of a body.This method is useful when one wishes to find the centroid of a complex planar shape with unknown dimensions. It relies on finding the center of mass of a thin body of homogeneous density having the same shape as the complex planar shape.Subdivision This is a method of determining the center of mass of an L-shaped object.Divide the shape into two rectangles, as shown in fig 2. Find the center of masses of these two rectangles by drawing the diagonals. Draw a line joining the centers of mass . The center of mass of the shape must lie on this line AB. Divide the shape into two other rectangles, as shown in fig 3. Find the centers of mass of these two rectangles by drawing the diagonals. Draw a line joining the centers of mass. The center of mass of the L-shape must lie on this line CD. As the center of mass of the shape must lie along AB and also along CD, it is obvious that it is at the intersection of these two lines, at O.Of a composite shape This method is useful when one wishes to find the location of the centroid or center of mass of an object that is easily divided into elementary shapes , whose centers of mass are easy to find. Here the center of mass will only be found in the x direction. The same procedure may be followed to locate the center of mass in the y direction. The shape. It is easily divided into a square , triangle, and circle. Note that the circle will have negative area . From the List of centroids , we note the coordinates of the individual centroid. From equation 1 above: units. The center of mass of this figure is at a distance of 8.5 units from the left corner of the figure.A direct development of the planimeter known as an integraph, or integerometer, can be used to establish the position of the centroid or center of mass of an irregular shape. This method can be applied to a shape with an irregular, smooth or complex boundary where other methods are too difficult. It was regularly used by ship builders to ensure the ship would not capsize. See .
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