Small jumping of a slider under various sliding conditions has been observed. The results of measurments of the contact resistance during sliding contacts indicated that many small jumps occurred during ordinary sliding contact. The mean duration of the jumps was about 3 milliseconds, their mean frequency increased with increasing sliding velocity. The number of jumps was roughly proportional to the real sliding distance, about 10³ jumps per 1 meter of sliding. The ratio of non-contact vs. contact time increases with increasing sliding velocity and easily exceeds 75% under ordinary sliding conditions. The mean duration of real contacts decreases from 4 milliseconds to 1.6 milliseconds with the increase of the non-contact ratio. The wear sustained by the specimens (sintered-metal pins and copper rings) were also measured, in the from of the difference in weight before and after sliding. The results indicated that the noncontact ratio has little influence on the specific wear rate, Despite the short mean contact time, Holm's law of adhesive wear is found to be appropriate for such sliding conditions as teese, in which the jump frequency is high.