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## #1 2012-11-23 03:35:43

pokrate
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### Understanding boat-river problem

Today while solving a boat / river problem, I wasn't convinced of vector drawing to find velocities. I was thinking of force acting on the boat which affects its position and velocity. But I couldn't think clearly of FORCE equation to find displacement, accelerations etc. Please help me. Assume river velocity : VR, Boat still water velocity : VB, Distance from Point A to B = D (straight distance from bank to bank). Now please explain how to find position of the boat in the form r = f(Ө) .

## #2 2012-11-23 03:39:27

bob bundy
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### Re: Understanding boat-river problem

If the boat is driven by the current then there's no force relative to the stream.  I would stick to velocities.

Bob

You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei