Optical sensor with height adjustment and bearing bracket are fastened to the rod. Physical pendulum knife edge bears on one of the bracket arms, and a ball of simple pendulum is suspended by threads on the other arm. Freely movable along the rod bearing bracket allows to change length of the pendulum arm. For oscillation time registering eletctronic stopwatch is used. It measures necessary number of periods of pendulum (from 10 to 100 with discreteness 5 periods) and oscillation time with accuracy 0,01 sec.
The training system is supplied with technical and methodical documentation for teaching staff.