Check out our Youtube channel for the latest Playlists and updates:https://www.youtube.com/user/overunitydotcom/playlists?view=1&flow=grid

If you take away friction, both scenarios privide the same kinetic energy at the bottom.Say the spiral is 1m high and its track is 10°.Then the length of the track is approx 5.7587704m.The acceleration of the ball at this angle is sin(10)×9.81ms^2=1.7035ms^2.The final velocity is 9.81ms.This result is valid if the ball does not roll, but slides along the frictionless track. If it rolls, the spinning mass gains rotational momentun, and the velocity will be less than 9.81ms at the bottom.If you drop the ball from 1m hight, its kinetic energy is the same as the ball sliding or rolling along the spiral track.Vidar