向僵尸开炮里万有引力是什么

activity uh， the the explanation for gravity is that matter ben space and so you put mass in a place and space it warp space time and objects are not feeling a force of gravity there is following the natural curvature and so this is a sheet of bike rock where do you get this this is my old bike shorts there's literally a spandex com you can get a sheet like this if you buy the sale stuff so you don't care what it looks like right for like twenty bucks maybe west depending on the sale and so you put matter and it works space time and so if i have another object it also works based on they feel that and they're attracted to each other and so that's einstein picture or graph objects workspace time feel that courager and move accordingly and if you have more mass you're right there oh you have more mass it's going to then space time more and so if you have objects here you're gonna respond to that right and so you put something there now it's attracted now in reality that big mass would feel the working of space time by the marble too right it would move a little bit we usually we usually ignore that you know the earth makes the sun move a little bit but it's so small you can ignore it the moon makes the earth kind wobble around a point three quarters of the way from the center of the earth we usually don't account for that when we're looking at satellite motion well instead of just letting go of one what if i give it a sideways push now at orbits now it's losing energy which wouldn't happen in the solar system right not noticeably there are some perturbations from other planets and things but this one does lose energy in spirals in if i don't push it as hard， it will do the lips for a while anyway and more here so one of the things i thought i would do with this is when you study the solar system all the planets are going around the sun the same way， why is that did god decide that he only liked clockwise or whether he's above or below the solar system right， why is everything going in the same direction well， the answer is it wasn't different directions， but there was a preferred direction the disk that formed from had a slight preference one way versus another and things going the opposite way got eliminated and when it's all said and done everything's going the same way that usually that works ninety percent of the time is it like the toilet flushing， southern hemisphere and you do that again and so it won't work that and so i have slightly more in one hand than any other but i don't consciously do that and you want to give them so they spread out a little when you throw it and because they're colliding with each other that you the ones the ones going up the wrong way get eliminated right now， there also would have been you know this is where this analogy breaks down there's you know another dimension right but those things are out of the plane also that weren't near the preferred plane also got eliminated and so that's kind of cool now my students use a phet fet simulation called my solar system and so they've seen all this on the computer and when we do this during our special relativity unit through like hey， it's just like the computer that's kind of cool that a stretchy the lycra modelsing sets just like it， but similar to the computer now some things we've discovered using this also it's just some larger marble time to put them out but they've been space time too right and so maybe you can get one thing to orbit another there we go so the earth moon system maybe and so you can see that this seam you know you can't buy like or this big you get it in rolls and you have to sew it together i've been told to use stretchy string stretchy thread to sew it together and so next time i do it i'll do that because it pulls and so just a little bit of thread fixes it and so in the morning when i first set this up i love it leaning against the table i'll be underneath fixing holes from last year one time my principal walked in and i hear somebody in the room and i'm underneath i'm in the middle sewing it i'm not gonna pause yet and he's looking around for me and he kind of knows somebody's in the room he's oh there you are he just wonder you're doing there and i go on repairing the rip in the fabric of space time what is it what do you think i can often？ do you get to say that another thing that says you probably seen plastic ones of these right the discovery center， children's discovery museum and san jose has one exploratory has one sometimes they have made shopping balls you put money in it but one thing you can't do with those is put two masses in and so when we went to the moon when we first started we sent our spaceships on what are called free return trajectories so they would go to the moon this is hard to get to happen and they would come back and like a figure eight and so that lets you show now of course it moves a lot smaller but if you look at the plots of the free return trajectory back from the apollo program you'll see it has a figure eighth， sort of shape and so this takes a little bit of practice to be able to do the figure eight these clamps around here you can adjust it to make it tighter if it's not working so steve and i when we set this up in the morning played around with it and actually i think it was working better than usually is so not easy to do and so i go through that one year a kid who read some stuff about the dark energy they have our dark energy pulled like having to have an extra oh i guess any of these work and so i'm just thinking energy what does that makes everything come apart right and so dark energy with me that goes apart rather than toward it so if you can work in dark energy anytime right and so i go through that spiel maybe it takes me ten fifteen minutes talking with the kids you know stuff they're not familiar with and then i i just let him play and so that's where we discovered the earth moon thing is i just let him play and they're like mr berns come over here look and they're all excited because they discovered that so oh yeah it's good wow and so there's then i just i throw out a few other things so they can try this collected stuff over time and put out all the models so if you want to try it out but we probably want to get back to it， but we want to play mr burns so i say the whole thing if you bottle parts and everything it's about a hundred dollars but one of my favorite days so you're gonna do it monday right steve um but just you do it once and you'll be hooked uh and it it it will take a little bit of fool into to put it together but i'll i'll post the plants and it's it's not a whole lot of work so they take a partable thing right it it takes it comes apart all p v c pipe wrap it with a bungee cord stuff the micro in that box and i can carry the whole thing myself this is about the right size you can get your whole class around it pretty much smaller one problem is reaching so some of you i think would have trouble with that so you get a student to do it right one thing you got to watch though is some students will think to go underneath to push up and then while they're underneath somebody decides to put the big mask and you know they get their space time worked and so just tell me you can't go under we will catch google get things ourselves you know we have a nice time catch google and so is general relativity in the state standards no probably the the crowning achievement of science not in the state standards can you fit in after the star test you bet you can find some videos i show a thing on gravity waves and then we do this and mess a day almost a day under the world but since i don't understand it myself that's plenty so let's go back into the room。