So I am leaning about various topics like physics like simple machines, center of mass, momentum, energy conservation, equilibrium but the more I study these "upper" level concepts the more I realize that I don't understand the very basic concept of force. Especially, graduating from the simplistic model of viewing objects as point particles to now examining them as objects with spatial dimensions (whether it might be symmetric or not), I have problem conceptualizing how (or whether even) force transmits through out the body of an object when it is specifically exerted only through one side of the body.
I know that mechanical force is possible b/c of electromagnetic reasons, so , let's suppose, if I have a object that is big and cube in shape and I happen to push that object with my hand touching the object on only one area (which is the area of the object that my hand happens to cover), can i assume that that the force that exert on only a certain area will travel to reach/influence all the other the other atoms making up the object no matter how far it is from the exact point of contact? Or will the force get weaker the farther other areas of the object is from the point of contact? If this way of thinking about force in physics correct or faulty?
This confusion specifically starts bothering me when I reach those other concepts like simple machines, static equilibrium, torque when there are multiple separate objects that are in contact with each other (like in of lever where you have seperate objects like fulcrum, lever, ground all touching each other or in static equilibrium you have things like wall, beam, ground all touching each other)and I now having trouble thinking how force diagrams work or why an object breaks under tension or how simple machines give mechanical advantage or how torque is possible etc... So if anyone can give their insight into this problem, that would be greatly appreciated. Thanks.