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Define concurrent forces and describe eq...

Define concurrent forces and describe equilibrium of concurrent forces.

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Concurrent forces The forces whose lines of action intersect at a common point and the vector sum of these force at the common point is zero, are called concurrent forces.
Condition for equilibrium concurrent forces
A body is said to be in equilibrium when the body does not change its position (state) in the absense of any net external force. If the body is at rest, the equilibrium is called static equilibrium otherwise it is called dynamic equilibrium. Let forces `vecF_(1),vecF_(2),---vecF_(n)` act on the body. The body will be in equilibrium, if vector sum of all the forces acting on it is zero. That is
`sum vecF=0`
Or `vecF_(1)+ vecF_(2)+ vecF_(3)+ "_______"+ vecF_(n)=0`
This is required condition for the equilibrium of the concurrent forces.
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