Bohóc -lemez balansz
|Availability:||Last 2 db in stock|
|Belengetve a szerkezet hintázni kezd, a bohóc integet.|
Perpetual motion describes "motion that continues indefinitely without any external source of energy; impossible in practice because of friction." It can also be described as "the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear".