of 10 the energy of the impulse transfer bolt is subsequently restrained and recovered by the impulse sail 21 for the purpose of transferring the acquired kinetic energy of the transfer bolt into the combined inertial mass of the teaching aid device representing an isolated system the stored potential energy of the counter weight 2 a 2 b and the main pull spring assembly 30 is held in the potential energy prone position by the throw arm release lock 22 consisting of a flat flexible material fastened to the frame 1 and engaged with the throw arm 8 on pin 32 until released by the pull string 16 the pull string 16 is guided by the guide tube 17 the natural final center point of gyration 9 location present on the fulcrum arm structure after the transfer bolt ejects from the ballistic barrel contains a rotatably mounted orbiting weights arm 31 which has a rotational potential kinetic energy magnitude energized through the orbiting weights pull spring 33 and the pulley 34 the orbiting weight arm is configured to rotate at the center point of gyration employing a pivot pin and a bushing arrangement the potential energy of the orbiting weights pull spring 33 is held in the potential energy prone position by the manual pull string 32 looped onto the end of the orbiting weighs arm a manual pull on the string 32 triggers the orbiting weights pull spring in releasing its stored potential energy into kinetic energy of the orbiting weights and start the operational sequence of the device the.