Force feedback device / force properties

Force feedback devices are, at first sight, a category of haptic devices that are able to exert a controlled force by the means of actuators in their mechanical (or gesture) interaction with a user. This definition, provided for the sake of simplicity, should be considered carefully. Anyhow, the expression force feedback device clearly relates with the idea of a controlled force. Hence, an important mean to evaluate these devices consists in considering their force properties.