Simple ..put equal weight at each end, equal distance from the pivot.
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if seesaw is balanced under its own weight with no added mass on it you cannot balance on one side. If it is unbalanced under its own weight u can add mass to balance on one side with mass depending on distance to pivot
It has seesaw geometry.
It needs to be balanced.
Weight x distance from fulcrum for each person must be equal. Eg a 10 stone man must be only half the distance from the centre as his 5 stone child.
Seesaw, as Br = 5 valence electrons, 1 electron for each F, one electron for the negative charge means it's a trigional byprimidal, however there is one unpaired set of electrons meaning it's a seesaw shape