Revival of the jumping disc

摘要

Snap discs made of bimetal have many technical applications as thermostats.Jumping discs are a toy version of such snap discs. Besides giving technical information, we describe physical investigations. We show especially how,through simple measurements and calculations, you can determine the initial speed (～3.5 m s～1), the acceleration(～30 000 m s～2)and the lower and upper snap temperature (～31; ～99 ℃). High speed videos give even deeper insight into the jump.