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**pokrate****Member**- Registered: 2012-11-16
- Posts: 13

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) .

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,659

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

Bob

Children are not defined by school ...........The Fonz

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

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