Formation of radial and concentric fractures in glass. Watch this bullet as it impacts the surface of a glass pane in slow motion. The force against the glass forms radial fractures first and then concentric fractures. With the initial impact the glass bends forward and the radial fractures begin to form as they radiate from the center. This view shows the opposite side of the glass. As the bullet crowns through the glass the glass is pushed in the direction of the force. Notice the radial fractures moving away from the center of the impact and the concentric fractures forming a circular pattern while glass particles fly forward. You have completed this activity. Formation of radial and concentric fractures in glass.