Apparatus (2) for sensing and measuring and/or shear components of a force at an interface between two surfaces, which apparatus (2) comprises: (i) at least one flexible means (4) for receiving the pressure and/or shear components of the force and (ii) transducer means (6) for producing electrical signals consequent upon movement of the flexible means (4) in response to the pressure and/or shear components of the force, and the apparatus (2) being such that: (iii) the flexible means (4) comprises first and second electrode parts (18, 20) which are spaced apart by the flexible means (12) (iv) the first and second electrode parts (18, 20) move solely towards each other as a result of the pressure component of the force being applied to the flexible means (4) and (v) the first and second electrode parts (18, 20) move towards and parallel to each other as a result of the shear component of the force being applied to the flexible means (4).
