Absolute Motion, Rolling Disk
A solid disk rolls on a flat surface with a constant angular velocity, w.
Find the velocity and acceleration of point A as the disk rolls along.
Assume that there is no slipping between the disk and the floor.
First Step: Define the position vector for the point of interest.
This can be a unique equation for each different type of problem.
Use a fixed reference point as the origin.
Use the position vector of other points to help define the vector of interest.
In this problem, point A rotates around point O. So for any angle, q, we can define rA/O. Since rA = rO + rA/O, we need to find an equation for rO.