Focal curve on time scale

We introduced time scale in general then we studied time scale differential and integral, in addition we solved new examples and applications of the time scale. We defined curves, tangent vector, normal vector, binormal vector, curvatures, and focal curve then we solved examples of them. We created a new definition of curve, of tangent vector, normal vector, binormal vector, curvature and focal curve on time scale and we constructed a new equation of focal curve and focal curvature on time scale, we also constructed an equation of tangent vector, normal vector, binormal vector and curvature on time scale.