This leaves only the Earth's gravity to act on you, therefore you fall towards Earth (and if you are already standing on the ground, then the ground keeps you from falling further).
The same way that if the train is going along at a steady speed, you share that steady speed and all there is left for you to do is walk on the floor of the train so that you move (forward or back) at some 3 mph RELATIVE TO THE TRAIN.
You are still moving at 103 mph relative to the ground,
67,603 mph relative to the Sun,
517,603 mph relative to the Galaxy,
900,103 mph relative to the centre of the Virgo Supercluster (to which our Local Group belongs)
and so on.
In all these cases, you are "falling along" with Earth, relative to each frame of reference. The only thing which is not cancelled out is Earth's gravity, holding you to the ground.
Just like it is keeping you on the train floor, relative to the train, once you share the train's speed. If you were to try to jump onto a train going 100 mph, while you are jumping from a stopped bridge, your measly 3 mph would not make much difference in how hard you'd hit (unless you are in a movie, of course).
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Alexander say: Because we are in perpetual Orbit. As the Sun rotates around our galaxy, we rotate the sun and moon rotates around us. Everything is in equilibrium.
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Al say: Please go troll somewhere else.
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roger say: because of the sun's gravity. The sun is pulling Earth to it so that the Earth orbits the sun.
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Kevin say: Gravity
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say: Physics. It's so hard.
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