I want to calculate the function R(z) (R=radius, z=altitude) of a funnel in which a coin( if it has no friction and only gets a horizontal speed v) always stays on the same z-coordinate.
the radius of the coin is r and r<<R.
What function has the funnel and how would a sphere behave if it has the same mass and the same radius and gets the same speed.
You can see how they work when u watch this:
I think it is F_z=F_g.
pls help me
The function R(z) for a pointmass is e-function but what is it for a coin?