The next three videos were made by dropping an object on a board to break it. Each board was marked with a green sticker at the middle, and red and blue stars on the midpoints of its right and left sides, respectively. The red and blue stickers near the ends serve to identify the end. The title screen shows the initial mass of the board and of each of its major fragments. The boards were initially held in place by masking tape to minimize the transfer of momentum to the supports.
Andy Jacobs, a senior physics major, built a device that releases a board just before it is hit by a falling ball. Here is a photo of Andy cutting the string to release the ball:
