Modelová Otázka ID 2686 - 
Které z následujících tvrzení správně popisuje energii tělesa při volném pádu při zanedbání tření a odporu vzduchu?
Správná odpověď je: B
Dle zákona o zachování mechanické energie je v izolovaných soustavách, jíž je těleso v tomto případě součástí, celková mechanická energie, tvořená energií potenciální polohovou a kinetickou, konstantní. Bude‑li těleso padat volným pádem, poroste jeho kinetická energie stejnou rychlostí, jako se bude polohová potenciální energie tělesa zmenšovat. Dochází tak k přeměně jednoho druhu mechanické energie na druhý.
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