Force balance equations with moving base

AI Thread Summary
The discussion focuses on solving force balance equations for a system with a static base A and a movable base B. The user is uncertain about how to mark forces at the movable base, questioning whether to include horizontal components (Bx) or only vertical components (By). They seek clarification on the applicability of trigonometry for calculating forces at base B. The conversation emphasizes the need to understand force components in dynamic systems. Properly identifying these forces is crucial for accurate calculations in mechanics.
rihitz
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Homework Statement


IMG_20160929_162844.jpg

Given:
AD=DC = 9m
P=78kN
S=25Kn
Angle alpha = 35 deg
A is static but B is movable

I need to solve forces on the bases A and B
I do not understand where do I mark the forces if there is a base that can move.

Homework Equations

The Attempt at a Solution


My attempt:
IMG_20160929_162955.jpg

I am not sure whether there should be Bx or Ax.[/B]
 
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Is there only By on the base B? If so, is the B vector still calculateable with trigonometry, or the only force there will be By, without any Bx?
 

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