How to identify zero force members in trusses

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hey welcome back in this video I just

want to talk about zero force members in

trust systems so it's possible that in

some of these trusses that some of the

individual members will actually have no

internal forces depending on the

configuration of the externally applied

forces some of the ways I guess before

we start talking about that I want to

talk about these kind of three types of

joints we can have or joint

configurations with other members so

imagine looking at this top one imagine

if there was some internal force in this

member here there's two members

connected at one joint they're collinear

they're both in line with each other for

this joint to stay in static equilibrium

this other member has to have the equal

and opposite force in it so if it's

compression on this side it has to be