The Math of Buoyancy

[Saltheart]

Pure water (lets neglect salt water , fresh water etc and just say pure water)..When 1 cc of water is displaced , it will push back on the object dispacing it with 1 gm of boyant force. So if the objects density is more than 1gm/cc , the object will sink. If its less than 1gm/cc , the object floats.

So as long as all the lures are the exact same shape , they all have the exact same volume. If you adjust the total weight of the lure to the same weight for all by using lead to compensate for the density differences of the wood (without changing the outside envelope shape (volume) , the lures will all sink at the same rate.

Now yes water resistance plays a role and technically we should be discussing masses and acceleration do to gravity in terms of F=MA instead of weights but all that washes out to the bottom line that if an objects overall specific gravity is greater than 1 then it will sink. (Specific gravity is the density of the object divided by the density of the water..{SG=(D of Object)/(D of water)}