Now, let's say there's an asteroid moving near the planet in this direction. That by a less dense field with these arrows. As we move away from the planet, the field will start to weaken, and I'm going to represent I can draw these little field lines that show the direction of Now, the planet has a lot of mass so we know it's going to be surrounded by a gravitational field that points towards theĬenter of the planet. And these help us predict what forces objects will experience when they're in the field. Things associated with it: magnitude and direction. Magnetic fields will affect magnets and any other material So an electric field surroundsĪny object with a net charge, and the direction of this field The further you move away from the object, the less dense the field and Has a gravitational field surrounding it that points What are those? Well, for gravitational forces, these affect objects with mass. Space from an object with certain physical properties. So what is a field? A field extends through Objects they aren't touching, but how do these objects know if there's a force between them? To explain these non-contact forces, scientists eventually developed the idea that these objects were So since these forces are non-contact, they can exert a force on Field forces include non-contact forces, such as electric, magnetic, and of course, gravitational forces. In this case, the ball is inĮarth's gravitational field, and so it feels an attractiveįorce towards the Earth and the ball falls to the ground. So if an object is in that region, it will be affected by the force. Have to touch an object to exert a force on it. How can there be a force on it? Well, this is becauseĮarth's gravitational force is pulling the ball and In the air and let it go, you know it's going to fall, but why? Nothing is touching it once you let it go. ISS orbits at 8km/SECOND! That's 28,800km/h!!Ī bullet can have a speed of about 0.8km/s If it orbited much farther away, it wouldn't need to move this fast, the moon for example is slower than the ISS cuz it's much farther away. The International Space Station stays in space in the same way, but it's so close to earth that it actually feels some drag from the upper atmosphere, which slows them down and makes them lose some of that sideways motion and start falling down to earth, so every now and then they have to fire up their engines to give them more sideways motion and boost them up again.ītw the space station is moving SO FAST that if it were to whizz by right in front of your eyes, you would NOT see it! It's going faster than a bullet! That's how fast it needs to go to stay that close to earth in orbit. It IS falling towards the earth, but it's constantly moving fast enough to the side so it misses it all the time. That's also how the moon doesn't crash on the earth. If the rocket is in orbit, then it has enough sideways motion that it doesn't fall to the earth, if you could stop its sideways motion it WILL fall down. Tl dr: it's gonna have to be FAST! Sideways fast.
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