If the Earths atmosphere is air, then why doesn't the land fall? How is all the lava and water IN earth?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

Why does gravity have a lesser than grater effect on higher altitudes?