![]() ![]() Gravity for something near the surface of Simplifies to what's sometimes called as lower case g. ![]() The surface of Earth, because that's where If you say that this right here is the mass of Earth. If you take all of this stuff right over here combined- so Of the second object, divided by the distance that separates The first object- let me actually- times the mass Gravitational constant, times the mass of But the gravitationalĪttraction between two objects, so the force of gravityīetween two objects is going to big G, the universal Hopefully you've watchedįeel free to watch it. And so my weight- let me thinkĪbout the weight for a second- the weight is going to be equal That Earth is pulling down- or I should say- the force Just conversational usage, but that is not This in a new color- so my mass is 70 kilograms. The difference here, let's think about, I guess, Mass will accelerate more for a given force. Mass is, how does something react to a specific force? And we already learnedįrom Newton's second law that if you have a givenįorce and you have more mass, you'll accelerate less. More fancy physics, that still will exhibit mass. Other things that aren't what we would traditionallyĪssociate with matter, once we start going into With this definition right here, because there are Is- and this is not a technical definition,īut it will give you a sense of it- is how So mass is literally- there'sĪ couple of ways to view mass. On a regular basis, but are really muddled up If this disappeared (for example, if I was completely made out of water) then the answer would be obvious, even common sense: I would not hold my structure. The reason my hand does not fall apart is because each of the atoms in my hand are in some sort of bond (covalent or ionic) with each other, increasing greatly the force of electromagnetism between them, which allows each atom to have a fairly functional defined relationship to the rest of the atoms in my hand, thus retaining the structure. But if it did, then how is my hand keeping the structure of my hand? I am thinking it probably takes into consideration a whole bunch of other forces at that level, including the strong force, the weak force, and electromagnetism, which might cancel out gravity. However, I am still puzzled by the second case I gave. After thinking about it, I realize that the masses of my 2 hands are much smaller than the masses of the earth and myself, so even though they are a lot closer to each other, they are also a lot less massive, whch would explain why my hands don't impose a strong force on each other, even when they are touching. ![]()
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