Hi. Could anybody tell me how does a purse hook works? At first, I tried to ask myself why the hook will topple if we apply downward force at the end of the rod labelled "opening" (I know opening means different in the figure). I'd say that the base of rotating head (bottom-right corner) which is in contact with the table may acts as a fulcrum/ pivot point while we are "transferring" torque through the "opening" to the rod that is situated to the right of the rotating head. The same explanation would be given by me if I were to answer why the hook topples if we apply downward force on the rod situated to the right of the rotating head. Now let's apply downward force on the hook, again I tempted to say we are "transferring" torque all the way to the rod that is situated to the right of the rotating head. However, I know it is wrong! The fourth situation that I can think of is applying downward force on the ball-shaped/spherical end. This time the bottom-left of the rotating head will act as pivot point. But why? I start to think about center of gravity, line of center of gravity etc. , but how? I need help on explaining how it works. What a funny tool! Thanks.