Physics.Stop()

Hi guys, I have created a game that requires changing scenes. When changing scenes I want to stop the physics in the current scene running before moving on to the next scene. 

According to the research i’ve done  there is some code that is meant to go in 

function scene:exitScene( event )

– code to stop physics to go here

end

and

function scene:destroyScene( event )

– code to stop physics to go here too

end

does anyone know the code that stops the physics?

I hope this makes sense 

Thank You