Body:setLinearDamping
Sets the linear damping of a Body

See Body:getLinearDamping for a definition of linear damping.

Linear damping can take any value from 0 to infinity. It is recommended to stay between 0 and 0.1, though. Other values will make the objects look 'floaty'(if gravity is enabled).
Body:setLinearDamping( ld )
ld number The new linear damping