Seeking a victory to clinch the series, England put the Australians in to bat in overcast conditions and had them at 15-4 after 16 balls in 14 minutes, with three batsmen -- Chris Rogers, David Warner and recalled Shaun Marsh -- out for ducks.
Ben Stokes took a sensational one-handed catch at fifth slip to remove Adam Voges (1), leaving the score 21-5, and Broad completed the fastest ever five-for when Australia captain Michael Clarke (10) edged a slog to first slip.
It was Australia's joint-seventh lowest Test score and the tourists' chances of taking the series to The Oval for the fifth Test appeared in tatters.
A feeling of disbelief swept through Trent Bridge as the wickets tumbled, starting on the third ball of the day when Broad reached 300 Test wickets by enticing an edge from Rogers to Cook. The fast bowler was playing on his home Nottinghamshire ground.
England's catching was sharp, especially Stokes' jaw-dropping take diving to his right off Voges, and every opportunity was gobbled up.
It was another chastening session for Clarke, whose captaincy and place in the Australia team has been under scrutiny. He has scored 104 runs in seven innings this series -- although he was the second-highest scoring Australian batsman today.
