Lets consider a block of mass m, sliding down an inclined surface (no friction) at an angle ∅ with ground. The force exerted by this block on the inclined surface is mgcos∅ which is perpendicular to it. Now consider a cylinder of same mass m and rolling (without slipping) down the same plane. What will be the force exerted by the rolling cylinder on inclined surface? will it be mgcos∅ or something more than that due to its rolling motion.