# Curved Slope faster than linear?

So I saw this gif the other day, and was wondering, is this real or fake? And supposing there is no energy dissipated by the friction, why does such thing occur?

• Why would you think it is fake? What sort of explanation do you expect? The relation between the shape of a curve and how fast things move along it under gravity is not very intuitive, see e.g. brachistochrone problem – ACuriousMind Feb 1 '17 at 23:17
• note, the ball on the bumpy track does not reach the same peak altitude at the far side as the ball on the straight track does. The ball on the bumpy track lost more energy to friction (the track is longer!). So you cant really ignore friction. I believe the way to analyze this is look at the energy. In baseball the rule: keep your eye on the ball. In physics: keep your eye on where energy flows. – docscience Feb 2 '17 at 1:13
• – Frobenius Feb 2 '17 at 9:27
• Possible duplicate of Ball on a slope with hollow. – sammy gerbil Feb 3 '17 at 19:49