#### Casting

• In casting alone, the law of conservation of energy and Newton's third law are shown. The law of conservation of energy states that the total energy of an isolated system is a constant (Knight, 295).  Since energy can never be destroyed, casting is simply the transfer of energy. Fly line is weighted so that when your body moves the rod tip backward or forward, the line pulls in the opposite direction, which demonstrates Newton's third law. When the rod is bent due to its flexibility, energy is stored as potential energy.  We often refer to this as the rod being “loaded”. The potential energy is then transferred to kinetic energy (movement). This process happens on both the back and forward cast (AIP, 2011).

• The more that the rod tip bends, the more energy gets stored. The more energy that gets stored, the faster the line will move. This allows further and more accurate casts.  Fisherman achieve this extra bending by doing whats called a “double haul”. Double hauling is pulling the line sharply with your second hand while the casting hand moves the rod forward or back. This extra bending of the rod increases the potential energy.