Centroids Method of Composite Areas

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1 Cetrods Method of Composte reas small boy swallowed some cos ad was take to a hosptal. Whe hs gradmother telephoed to ask how he was a urse sad 'No chage yet'. Cetrods Prevously, we developed a geeral formulato for fdg the cetrod for a seres of areas 2 Cetrods by Composte reas Moday, November 2, 202

2 Cetrods was the dstace from the y-as to the local cetrod of the area 3 Cetrods by Composte reas Moday, November 2, 202 Cetrods If we ca break up a shape to a seres of smaller shapes that have predefed local cetrod locatos, we ca use ths formula to locate the cetrod of the composte shape 4 Cetrods by Composte reas Moday, November 2, 202 2

3 Cetrod by Composte Bodes There s a table the back cover of your book that gves you the locato of local cetrods for a select group of shapes The pot labeled C s the locato of the cetrod of that shape. 5 Cetrods by Composte reas Moday, November 2, 202 Cetrod by Composte Bodes Please ote that these are local cetrods, they are gve referece to the ad y aes as show the table. 6 Cetrods by Composte reas Moday, November 2, 202 3

4 Cetrod by Composte Bodes For eample, the cetrod locato of the semcrcular area has the y-as through the ceter of the area ad the -as at the bottom of the area The -cetrod would be located at 0 ad the y-cetrod would be located at 4r 3π 7 Cetrods by Composte reas Moday, November 2, 202 Cetrod by Composte Bodes If we wated the cetrod wth respect to aother as, say alog the top of the semcrcle ad alog the left edge, the values the table could t be used eactly y C 8 Cetrods by Composte reas Moday, November 2, 202 4

5 Cetrod by Composte Bodes The table would gve you the dstace of C above the base of the semcrcle, but that s t the dstace from the cetrod to the -as 9 Cetrods by Composte reas Moday, November 2, 202 Cetrod by Composte Bodes y 4r/3π C 0 Cetrods by Composte reas Moday, November 2, 202 5

6 Cetrod by Composte Bodes Sce the radus of the semcrcle, ths case the dstace to the y-cetrod would be 4 y r r 3π Cetrods by Composte reas Moday, November 2, 202 Cetrod by Composte Bodes y 4r y r 3π 4r/3π C 2 Cetrods by Composte reas Moday, November 2, 202 6

7 Cetrod by Composte Bodes By the same logc, the dstace to the - cetrod would be r 3 Cetrods by Composte reas Moday, November 2, 202 Cetrod by Composte Bodes y r r-(4r/3π) 4r/3π C 4 Cetrods by Composte reas Moday, November 2, 202 7

8 Eample Lets start wth a eample problem ad see how ths develops 3 5 Cetrods by Composte reas Moday, November 2, 202 Eample We wat to locate both the ad y cetrods 3 6 Cetrods by Composte reas Moday, November 2, 202 8

9 Eample There s t much of a chace of developg a fucto that s easy to tegrate ths case 3 7 Cetrods by Composte reas Moday, November 2, 202 Eample We ca break ths fgure up to a seres of shapes ad fd the locato of the local cetrod of each 3 8 Cetrods by Composte reas Moday, November 2, 202 9

10 Eample There are multple ways to do ths as log as you are cosstet 3 9 Cetrods by Composte reas Moday, November 2, 202 Eample Frst, we ca develop a rectagle o the left sde of the dagram, we wll label that as area, 3 20 Cetrods by Composte reas Moday, November 2, 202 0

11 Eample secod rectagle wll be placed the bottom of the fgure, we wll label t Cetrods by Composte reas Moday, November 2, 202 Eample rght tragle wll complete the upper rght sde of the fgure, label t Cetrods by Composte reas Moday, November 2, 202

12 Eample Fally, we wll develop a egatve area to remove the quarter crcle the lower left had corer, label t Cetrods by Composte reas Moday, November 2, 202 Eample We wll beg to buld a table so that keepg up wth thgs wll be easer The frst colum wll be the areas ID rea ( 2 ) Cetrods by Composte reas 3 Moday, November 2, 202 2

13 Eample Now we wll calculate the dstace to the local cetrods from the y-as (we are calculatg a -cetrod) ID rea ( 2 ) () Cetrods by Composte reas 3 Moday, November 2, 202 Eample To calculate the top term the epresso we eed to multply the etres the last two colums by oe aother ID rea *rea ( 2 ) () ( 3 ) Cetrods by Composte reas 3 Moday, November 2, 202 3

14 Eample If we sum the secod colum, we have the bottom term the dvso, the total area ID rea *rea ( 2 ) () ( 3 ) Cetrods by Composte reas 3 Moday, November 2, 202 Eample d f we sum the fourth colum, we have the top term, the area momet ID rea *rea ( 2 ) () ( 3 ) Cetrods by Composte reas 3 Moday, November 2, 202 4

15 Eample Dvdg the sum of the area momets by the total area we calculate the -cetrod ID rea *rea ( 2 ) () ( 3 ) bar Cetrods by Composte reas 3 Moday, November 2, 202 Eample You ca always remember whch to dvde by f you look at the fal uts, remember that a cetrod s a dstace ID rea *rea ( 2 ) () ( 3 ) bar Cetrods by Composte reas 3 Moday, November 2, 202 5

16 Eample We ca do the same process wth the y cetrod ID rea *rea ( 2 ) () ( 3 ) bar y y 3 Cetrods by Composte reas 3 Moday, November 2, 202 Eample Notce that the bottom term does t chage, the area of the fgure has t chaged ID rea *rea ( 2 ) () ( 3 ) bar y y 32 Cetrods by Composte reas 3 Moday, November 2, 202 6

17 Eample We oly eed to add a colum of y s ID rea *rea y ( 2 ) () ( 3 ) () bar.954 y y Cetrods by Composte reas Moday, 3 November 2, 202 Eample Calculate the area momets about the - as ID rea *rea y y *rea ( 2 ) () ( 3 ) () ( 3 ) bar.954 y y Cetrods by Composte reas Moday, 3 November 2, 202 7

18 Eample Sum the area momets ID rea *rea y y *rea ( 2 ) () ( 3 ) () ( 3 ) bar.954 y y Cetrods by Composte reas Moday, 3 November 2, 202 Eample d make the dvso of the area momets by the total area ID rea *rea y y *rea ( 2 ) () ( 3 ) () ( 3 ) bar.954 y bar y y Cetrods by Composte reas Moday, 3 November 2, 202 8

19 Eample Problem 9-60 Problem Cetrods by Composte reas Moday, November 2, 202 Eample Problem Cetrods by Composte reas Moday, November 2, 202 9

20 Homework Problem 9-64 Problem 9-65 Problem Cetrods by Composte reas Moday, November 2,

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