flyguy56 10 Posted December 14, 2008 I'm stuck with how to find the buoyancy force on an object. I know how to find density but I can't find it in my textbook how to find the buoyancy force. Could someone help with the general idea of finding the buoyancy force? I don't need the answer, just what equation I should be using for this. Thanks. 0 Share this post Link to post Share on other sites
insane_alien 840 Posted December 14, 2008 there are two ways of doing this 1/ you can do a differential force balance by considering the geometry of the object and the respective depths(this is only practical for simple shapes as it can get very complicated very quickly) 2/ you work out the mass of water displaced by the object. the weight of this displaced water will be equal to the buoyancy force. 0 Share this post Link to post Share on other sites
flyguy56 10 Posted December 14, 2008 Okay, didn't understand the first one, so for the second one. If the mass of the object is 180 kg - then the weight is f = mg or f = 180 kg * 9.8m/s^2 = 17287.2 N. Is that correct? I'm so lost. 0 Share this post Link to post Share on other sites
swansont 7437 Posted December 14, 2008 How much volume does the object displace? (You can get this from the mass and density) The weight of water of that volume is the buoyant force. 0 Share this post Link to post Share on other sites
Bignose 946 Posted December 14, 2008 flyguy, for the second choice, look up "Archimedes' Principle" in your favorite Internet search Engine 0 Share this post Link to post Share on other sites
flyguy56 10 Posted December 16, 2008 Thanks for the help everyone. So F = dvg. Thanks for all the help. See ya around. 0 Share this post Link to post Share on other sites