rúk

In a sentence

• Podali sme si ruky na znak dohody.

  We shook hands as a sign of agreement.

  Here, 'rúk' is in the plural genitive case to express possession or relation (belonging of hands to us).

• Rukami prestrihol povraz a oslobodil zajatca.

  With his hands, he cut the rope and freed the prisoner.

  In this sentence, 'rukami' is used to denote the instrumental case indicating the means by which the action is performed.

• Zvuk spadol na ruky, aby chrániť chúlostivú porcelán.

  The sound fell onto the hands to protect the delicate porcelain.

  Here, 'ruky' is accused to represent the anatomical part receiving the action.