# Apparent velocity of a particle in a rigid body

Say we have a rigid body $B$ and a particle $p$ in $B$. Let $F$ be a fixed inerial reference frame and let $F'$ be a (possibly non-inertial) frame embedded in $B$. On one hand, I know that the velocity of $p$ relative to $F$ is given by

$$v_p = v_o+ w \times (r-O')$$ where $v_o$ is the velocity of the "origin" O' of $F'$, $w$ is angular velocity of the body $B$, and $r$ and $b$ denote the position vectors of $O'$ and $p$ with respect to $F$. On the other hand, I also know that

$$v_p = V_o + \Omega \times (r-O') + v'$$ where $v'$ denotes the apparent velocity of $p$ as seen in the frame $F'$

Comparing these two equations gives $v' = 0$, so does this mean that the apparent velocity of any particle in a rigid body relative to a fixed point in the body is zero?