I can't find anything on the internet about this... How is it done? I've got a smooth curve given by these parametric equations: y = 5cos( theta )+5; x = 5sin( theta ) taking g = 9.81 how can I model the position of the ball as a function of time? Or how can I model it so that i can write it in multiples of deltatime? (e.g. new_pos = current_pos + velocity*dt) how can I estimate, or determine the time it takes to slide down it?