I'm having a bit of trouble understanding a basic concept of it.I always hear that it can be represented by the curvature of a rubber sheet when a ball is placed on it.The thing that confuses me is that in that representation, the only reason the ball pulls the sheet down is because of the Earth's gravity.I do understand that effect is to happen in all directions. Even then, you can still break it down to that same thing. Is there a better representation to understand this concept? I'm a Jr. in high school so I don't have a lot of the education needed to explain this stuff mathematically. So a simple example would be best! Thanks.
A Rim Lock or Night Latch is simplest. See link. /en/yale/couk/Produ
Well, this sounds strange, but in a vacuum, a rocket is pushing against its own fuel. Put yourself in a chair with good wheels on the floor of your school's gym. Pick up a volleyball and throw it straight out horizontally as fast as you can. If things are perfect, you'll move a little. In this case, as odd as it sounds, the volleyball was the fuel, and you were the thrust that pushed back, thus propelling the rocket in the vacuum of space. This would also happen if you had some kind of fire-hose in space, or a heavy machine gun that you could just put on full-automatic and walk away, etc. Things are pushing against themselves. When you push your palms together, you can push really hard so much that it hurts. This is the same process just that in this case, because your arms, etc., are holding you in place, you don't get movement.
This law states that for every action there is an equal but opposite reaction. When you walk, you exert force downwards to the ground, because there is an opposite reaction, you propel forward. This also applies to the rocket. It does not need air because it is already exerting a force downwards, which moves it up.
