# Equilibrium of current forces

#### LATEBLOOMER

##### New member
I wonder if there's a physics person here who could help me solve this problem.

the loads applied to the truss shown in the figure cause reactions shown at A & D. A free body diagram of hinge A forms concurrent force system shown enclosed at A. Determine the magnitude of forces P & F directed respectively along bars AB & AE that maintain equilibrium of this system.

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#### Klaas van Aarsen

##### MHB Seeker
Staff member
I wonder if there's a physics person here who could help me solve this problem.

the loads applied to the truss shown in the figure cause reactions shown at A & D. A free body diagram of hinge A forms concurrent force system shown enclosed at A. Determine the magnitude of forces P & F directed respectively along bars AB & AE that maintain equilibrium of this system.
Hi LATEBLOOMER!

First step is to find all external forces based on the conditions for equilibrium ($\sum F_x = 0, \sum F_y = 0, \sum M_A = 0$).

Suppose the external force at A on the truss has 2 components $A_x$ and $A_y$, and similarly at D we have $D_x$ and $D_y$. Can you find these forces?
I suggest you start with calculating the moments of all external forces with respect to A.

#### Ackbach

##### Indicium Physicus
Staff member
I suggest you start with calculating the moments of all external forces with respect to A.
Just a comment: in US physics, at least, moments are called torques. See here and here.