1. An input system comprising: one or more sensors operable to output one or more physical parameters of an input device reflective of at least one of, a force applied to the input device by a user, a speed of motion of the input device, a direction of motion of the input device, and an acceleration of the input device; one or more processors; one or more computer readable memories comprising instructions that, when executed by the one or more processors, perform operations comprising, determining, based on an output of at least one sensor, an angle of tilt of the input device about a tilt axis; determining if the angle of tilt of the input device is within a predetermined range; if the angle of tilt is within the predetermined range, operating the input system in a gesture mode in which the output of the sensors is monitored to determine if a gesture of at least one predetermined gesture has been performed; and if the angle of tilt is not within the predetermined range, outputting a signal to move a cursor displayed on a graphical user interface based on a velocity of movement of the input device along a surface, the velocity determined based on the output of the at least one sensor.