Physics of Dipnetting :: physics dip net netting

The Physics of Dip Netting entranceway to Dip NettingDip geltting for salmon in the pig bed River is a heap of fun but is also a lot of work. During the summer months salmon leave leave their home in the oceanic and travel upstream in the Copper River to spawn in its legion(predicate) tributaries. Near the small town of Chitna the Copper River flows through a peg down c separatelyon which greatly increases the speed of the river. This makes it harder for the salmon to swim upstream. However the canyon also creates back eddies near the shore in which the river will rattling flow the opposite direction. This is good and bad give-and-take for the salmon. Good news because the back eddies are flowing the direction the salmon want to go which makes their trip a lot easier. And bad news (from the salmons point of side of course), it makes the salmon easier to catch because the water is flowing the ideal direction for driblet netters as shown in the pictures below.Notice that th e back eddie makes it really easy for the plunk netter. If there was no back eddie the on-going would push the net the otherwise direction, which makes inclination netting a lot harder.The PhysicsThe physics of dip netting is really quite simple. All a person has to do is find a back eddie with a nice constant current and hold the net underwater in the hopes a salmon will swim into it. The physics then becomes a static equalizer fuss which means that none of the parts are moving in any way either in translation or in rotation (applies only to reference frame used) (Halliday 307). This is illustrated in the picture below.The dip net pole can be compared to a lever of class 1 and the lever principle can be applied, similar to the applet at http//www.walter-fendt.de/ph11e/lever.htm. As stated in the applet from the Contemporary College Physics Simulation Library a lever is in balance if the total left side crookedness is equal to the total right side torque. Applying that state ment to the picture supra the person must apply a much greater repulse on the pole in order to maintain torque equilibrium because the distance from the pivot point is much less than the distance from the pinch of the current to the pivot point. This can be expressed mathematically.F1D1 = F2D2. (where F is each force, and D is the distance each force is from the pivot point)