OK, so the acceleration is 0 but the ball keeps moving toward the other side because of inertia, and as the acceleration gets stronger towards the center, it turns around and falls back down the other way. Without friction, can it oscillate forever?
Homework Statement
You drill a narrow hole through the center of the Earth and drop a ball of mass m into it. Describe its motion qualitatively.
Homework Equations
F=-G*M*m/r^2
The Attempt at a Solution
I was thinking that the ball would fall toward the center of the Earth and...