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...Crest foundation studies fundamentals of fluid mechanics the momentum equation definition applications force due to flow around a pipe bend impact jet on plane curved vane we have all seen moving fluids exerting forces lift an aircraft is exerted by air over wing water from hose exerts whatever it hits in analysis motion performed same way as solid use newton s laws account also taken for special properties when statement second law and relates sum acting element its acceleration or rate change you will probably recognise f ma which used relate applied not clear what mass should so different form nd can be written body equal resultant takes place direction determine consider streamtube did bernoulli start assuming that steady non uniform flowing stream tube three two dimensions time t volume moves inlet distance ut entering area u this has density velocity tu similarly at exit obtain expression leaving steamtube now calculate using au know continuity qa if constant i e then write fq al...