![]() This configuration is stable if a plumb line from its CENTER OF GRAVITY falls within the base. This too is remarkable to discover.Į - Using the IDEA OF CENTER OF GRAVITY we show some "systems" which look very unstable but which are indeed very stable because we make use of this~GREAT IDEA:ġ - THE CASE OF THE FORKS IN THE CORK STOPPER THE CASE OF THE LITTLE MAN ON THE STAND THE CASE OF THE MONKEY ON THE STAND:Īll these configurations are stable because the CENTER OF GRAVITY of the system lies below the point of support.Ģ - THE CASE OF THE LEANING TOWER OF PISA: of a body (or a system) can lie - can be - where there is no "stuff" - no material! Accordingly -we can say that the CENTER OF GRAVITY of a doughnut is in the middle of the hole. We learn in this adventure that a strange thing can occur: The e.g. And having said this there is NO stick any¬where else! A remarkable thing to discover.ĭ - We show also the CENTER OF GRAVITY or CENTER OF MASS of some simple geometric shapes using a plumb line. ![]() We use here the terms CENTER OF GRAVITY and CENTER OF MASS inter¬changeably although they are strictly different things.Ĭ - We now show experimentally - and this is where all proof lies - using a meter stick - that the CENTER OF MASS of the stick is indeed that point where ALL THE STICK IS. ![]() So they both in truth DO RO LL DOWN.ī - Although definitions are dangerous - since we can not always tell all the truth in one sentence - we can say - for our purpose here - that by CENTER OF GRAVITY we mean that point in a body or system where we may IMAGINE all the weight of the body to be. The energy of a system tends toward least. What does happen is this: The center of gravity of the cylinder seeks a lower potential plane the center of gravity of the cone seeks a lower potential plane. This is not true - of course - although it looks so. A double-cone, however, rolls UP! Or so it seems. A uniform cylinder - like a rolling-pin - does roll DOWN. Things that can roll - when put at the top - should roll downhill. In this program we show a number of enchanting and dramatic DEMONSTRATIONS bearing on the IDEA.Ī - In the very first demonstration we show a double-track which serves as an inclined-plane. The IDEA OF CENTER OF GRAVITY plays an enormous role in the affairs of men.
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