physic...wat is dat?

my name is sardin and i am 21 years old..study at uitm jengka,diploma in science and i choose physic instead of biology...i take modern physic and electronic.. in modern physic,i learn about nuclear, radioactive, atoms and so much more, but basically we had already learn about momentum, inertia, and others just like physic form 5 but much details..ok..wat i really want to write is..my father asked for a pen and paper..then he draw a tank and pipe inside it..i was like...'okey..there is a pipe in a tank..ahaa..and d position is like dat..ok..ahaa..'..then my father.." do u think dat if i put something rite over here[pointing at his drawing]..the force is still d same or i just make it worst?..kita ada masalah karat sekarang..im thinking d way to reduce it..".."ohoOo..just buy a filter then..ahaha..".."no no no..there's another way.."..dats y i luv him..he ask me about physic!..adeii..[actually..i dont really know how to answer his question..hahaha]