To turn an airplane, a centripetal force (toward the center of the turn) needs to be generated by banking the wings. Lift now has a sideways as well as a vertical component. The vertical force must still be enough to counteract weight and the total lift generated by the wings must be greater than in straight and level flight, otherwise the aircraft will lose altitude. To develop this greater lift force at the same airspeed, the angle of attack must be increased by applying back pressure on the stick. The steeper the bank angle, the greater the lift force required to maintain altitude. If airspeed remains constant and the additional lift is generated by more back pressure on the stick with a resultant increase in the angle of attack, the aircraft will come closer to the point of stalling. Thus, a stall can occur at a much faster airspeed since stalls always occur at the same angle of attack.