Which statement best defines Resistant planar?

• A. Non planar irregular fracture
• B. Planar shear that requires at least one tap to cross column and block doesn't slide easily
• C. Sudden crack in column
• D. Thin planar crack

Answer: (B)

Resistant planar refers to a flat, planar shear surface that resists movement. The surface is stable enough that the block won’t slide easily on its own, requiring some additional perturbation—like a tap—to cross from one column to the next. That combination of a flat, planed interface and noticeable resistance to initiating motion is exactly what the statement describes: a planar shear that needs at least one tap to cross a column and where the block doesn’t slide easily. The other options describe non-planar or irregular fractures, sudden cracks, or only a thin crack, none of which capture the idea of a flat surface with notable resistance to sliding.