抄録
The frictional force between a fingertip and a flat surface of an object is not stable and changes each time. We measured the frictional force through rubbing on the surface of acryl plate by fingertip of forefinger of three men and eight women in life environment and reconfirmed that the frictional forces were not stable. Ten of eleven subjects succeeded to evaluate the difficulty to move the finger rubbing on the surface of the plate using a subjective rating scale method in five degrees. A subjective score revealed that the perceived interference was correlated to the magnitude of the frictional force between the finger and the surface. We recognized the sweat on the fingertip according to correlated value of the maximum coefficient of friction in the ten subjects though the sweat on the fingertip was not confirmed visually.
