Consider a rectilinear rod (A-B) with negligible mass that is attached, without friction, to a vertical OZ axis. The rod rotates about that axis with a constant angular velocity ω and it maintains a angle α with OZ. A particle of mass m moves about the rod and it is attracted by the gravity. a) Indicate, and justify the degrees of freedom of the material point. To write the degrees of freedom i have to know the equations of x, y and z. My problem is the z component equation. For x and y we have the following equation: x^2+y^2 = r^2 r is the radius (A-B) Now i need the equation for z.. any types?