PROP STRIKE WHEN A C172 PVT PLT; PLANNING A XWIND LNDG; FORGETS HIS LNDG GEAR WHEN ASKED TO PERFORM A SHORT APCH TO RWY 25.

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WAS PRACTICING TOUCH AND GOES. WINDS 310 DEGS AT 11 KTS. DID 3 TOUCH AND GOES ON RWY 28 WITHOUT DIFFICULTY. WANTED XWIND PRACTICE. TOOK RWY 25. FIRST LNDG A BIT BOUNCY; PARTIAL FLAPS. ON DOWNWIND; ABEAM THE NUMBERS; TWR ASKED FOR SHORT APCH. WINDS WERE BECOMING MORE GUSTY. TURNED FINAL 1/4 MI OUT. HAD THE CRAB IN AND WAS CARRYING SOME PWR. DID NOT DO MY GUMPS CHK. DID NOT HEAR ANY WARNING HORN. HEARD PROP STRIKE; INSTINCTIVELY TOOK PLANE AROUND (NOT WHAT I TEACH IN CRM COURSES). INFORMED TWR THAT I HAD A PROP STRIKE AND REQUESTED RWY 28; THEY ASKED THAT I FOLLOW A COMMUTER ON 2 MI FINAL. I DECLARED AN EMER AND LANDED. THIS WAS A CLASSIC SETUP. DIVERTED ATTN; BROKEN ROUTINE; (I ALWAYS CHK GEAR DOWN). WHEN I TEACH MEDICAL CRM COURSES ON ERROR MGMNT; I ALWAYS GIVE THE GEAR UP EXAMPLE THAT YOU DON'T GO AROUND; JUST PULL BACK THE PWR AND LAND (MITIGATE THE ERROR'S DAMAGE). I WAS AT LEAST ABLE TO RECOVER ENOUGH TO BE ASSERTIVE AND DECLARE AN EMER; AND TAKE THE RWY WITH THE LEAST XWIND. I EXAMINED MY OWN STATE OF MIND. I WAS WELL RESTED; CURRENT IN THE AIRPLANE; AND WANTED TO IMPROVE MY PROFICIENCY IN XWIND LNDGS. I NEED TO PICK UP THE WARNING SIGNS THAT AN ERROR CHAIN WAS DEVELOPING.