Question

If gravitational force is acting b/w all objects on the Earth...Then why and apple thrown in air cant attract the Earth towards itself

Answer 1

From Newton’s 2nd law, we know that acceleration is inversely proportional to mass.
F = ma
Acceleration = Fm
The mass of apple is negligibly small as compared to that of the Earth. So, for same gravitational force, acceleration of the Earth is very small. Thus, Earth will not move, whereas apple will have considerable acceleration (less mass), which brings it down. We can extend the same argument for why the earth does not move towards the moon.