Question

Why does the apple fall towards the earth why doesn't the earth fall towards the apple?

Answer 1

This is due to gravitational force:
Gravitational force is the force that act between two bodies by virtue of their masses.
The gravitational force of attraction of apple towards the earth and earth towards the apple is same but the mass of apple is much smaller than the mass of the earth so the apple falls towards the earth and earth having massive mass it is impossible for it to fall towards the apple.

Answer 2

Answer:

The moon does not fall to Earth because it is in an orbit.Gravity gets weaker as you go further out. The Earth's gravity is much weaker at the moon than at a low-earth orbit satellite. So the moon "falls" toward Earth due to gravity, but doesn't get any closer to Earth because its motion is an orbit, and the dynamics of the orbit are determined by the strength of gravity at that distance and by Newton's laws of motion.