Friction extracts energy proportionally to the amount stored.

Evidence

Dissipation of energy through friction is a kind of rent charged for storing the energy. The rent charged is proportional to the amount stored, payable by subtracting a fraction of what is stored. In a resonant system, the rent paid is high because more energy is stored. — Eric J. Heller, Why You Hear What You Hear- An…, 944

Categorization

• XREF: The rent metaphor resonates with the reader’s economic-institutions library, where reputation and trust are also stored and taxed.