Banked turn
（重定向自Angle of bank）
![Upper panel: Ball on a banked circular track moving with constant speed v; Lower panel: Forces on the ball. The resultant or net force on the ball found by vector addition of the normal force exerted by the road and vertical force due to gravity must equal the required force for centripetal acceleration dictated by the need to travel a circular path.](/Images/godic/202412/21/Banked_turn.svg4809.png")
![Douglas DC-3 banking to make a left turn.](/Images/godic/202412/21/Douglas_DC-3,_SE-CFP4809.jpg")
![Vector diagram showing lift, weight and centripetal force acting on a fixed-wing aircraft during a banked turn.](/Images/godic/202412/21/Banked_turn4810.png")
A banked turn (or banking turn) is a turn or change of direction in which the vehicle banks or inclines, usually towards the inside of the turn. For a road or railroad this is usually due to the roadbed having a transverse down-slope towards the inside of the curve. The bank angle is the angle at which the vehicle is inclined about its longitudinal axis with respect to the horizontal.