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Ravnoteža vanjskih i unutarnjih sila<br />
na presje enim dijelovima<br />
2. Desni dio: Sila P u paru<br />
1. Lijevi dio: Dodamo silu P<br />
R A<br />
Nemamo ravnotežu sila nego spreg sila<br />
+<br />
P<br />
≠<br />
0<br />
21