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Absorption of surface acoustic waves by a two-dimensional electron gas in aperpendicular magnetic field is considered. The structure of such system at thefilling factor $\nu$ close to 1/2 can be understood as a gas of {\em compositefermions}. It is shown that the absorption at $\nu =1/2 $ can be stronglynonlinear, while small deviation form 1/2 will restore the linear absorption.Study of nonlinear absorption allows one to determine the force acting upon thecomposite fermions from the acoustic wave at turning points of theirtrajectories.Comment: 7 pages, 1 figure, submitted to Europhysics letter

Nonlinear absorption of surface acoustic waves by composite fermions