# Fisika Study Center

## Center of Mass a Calculation Simplicity

physics.fisikastudycenter.com - Learning the center of mass, How to simplify the center of mass calculations. Sometimes it's usefull enough applying this method but if you do not feel confidence enough to use it, don't use! Some students got wrong answer when using this method but they got the correct one when using the ordinary way.

From above figure, try to find the location of center of mass of that shape, calculate only the x axis location, because we know that yo must be at 45 cm!

Our shape above actually cotents two shapes, a square (shape I) and a triangle (shape two). We assume that you don't have difficulties when finding the center of mass of each shape cause our point here is to show the calculations. Here are our data:

Shape I
Area → A1 = 90 x 90 (don't multiply)
x location → x1 = 45

Shape II
Area → A2 = 1/2 (90) x 90 = 45 x 90 (don't multiply)
x location → x2 = 120
Execute, insert the data to center of mass formula:

We have four groups in here. (90⋅90)45 as first group, (90⋅45)120 as the second, (90⋅90) as the third and (90⋅45) as the fourth.