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[Jan Stránský <question688078@xxxxxxxxxxxxxxxxxxxxx>]

Question #688078 on Yade changed:
https://answers.launchpad.net/yade/+question/688078

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

1)
b.state.mass = value

2)
b.state.vel = (vx,vy,vz) # setting velcity value, initial condition
b.state.blockedDOFs = "xyz" # if you want to preserve velocity regardless interactions

sidenote:
in answers, we usually use short variable names, like "b" for a body. In your case, "b" could be e.g. O.bodies[0], so you can use
O.bodies[0].state.mass = ...
or
b = O.bodies[0]

In another situation it could be e.g.
sph = sphere(...)
O.bodies.append(sphere)
sph.state.mass = ...

cheers
Jan
b.state.mass = ...

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