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How Newton's Laws Apply to Lacrosse
Transcript of How Newton's Laws Apply to Lacrosse
Learning how physics apply to the real world through the example of sports. Cradling: Lacrosse stick: Checking: Newton's First Law: Newton's Second Law: Newton's Third Law: An object in motion will remain in motion and an object in rest will remain at rest until acted upon by an unbalanced force. Force= mass x acceleration Every action has an equal and opposite reaction. How does this apply to lacrosse? How does this apply to lacrosse? How does this apply to lacrosse? Newtons second law of motion applies in many aspects of lacrosse such as passing, shooting, and checking. While passing and shooting, the force that the ball will arrive at its target with differing amounts of force. Since the mass of the ball always remains constant, the force that the ball will be thrown with is directly affected by how fast the player can accelerate his stick, which holds the ball, therefore accelerating the ball. The same is also true for stick checking. The mass of stick will remain constant and the force that will be imparted upon the offense man's stick is directly influenced by how fast the defenseman can accelerate his stick. Newton's First Law of motion applies to almost every action in lacrosse. It starts with the ball at rest on the ground. That ball will remain on the ground until an unbalanced force (a player) scoops the ball, picking it up. Newton's First Law also applies to passing and shooting. Once a player passes or shoots, the ball will continue in a straight path until it is acted upon by another players stick or the back of the goal. Gravity also plays a part in this system and will gradually bring the ball back to the ground if a player does not get the chance to catch the pass. The ball can also be at rest in the players stick until that player starts cradling, in which centripetal force will keep the ball in the pocket of the stick. Newton's Third Law also plays a key role in the game of lacrosse. Without this law, any pass thrown or shot taken would not be able to be stopped. When a pass is received, an equal and opposite force against the incoming ball is produced by the mesh of the stick. This equal and opposite reaction stops the ball and allows the player to catch it. When shooting, the back of the goal provides this reaction, stopping the ball from continuing on its previous path. Without this reaction occurring, the ball would keep going in its previous path and not stop. This law also ties in with Newton's First Law as the reaction described is also an unbalanced force that changes the ball's direction.
Newton's Third Law also applies to checking. When the defender checks the offender's stick, and equal and opposite reaction occurs, making both sticks move in opposite directions. The greater the force used, as mentioned in the second law, the more movement will happen during the check. In this example, the net did not provide an equal, opposite, and unbalanced force to stop the ball from continuing along its path. Therefore, the ball rips through the net. Eventually gravity brings the ball back to the ground. In these examples, both Newton's First and Second Laws are demonstrated. The ball is stopped from continuing on its previous path by the other person's stick and the net of the goal, both of which are unbalanced forces acting on the ball. Also, the mesh and net provide an equal, opposite, and unbalanced reaction to the ball, stopping it's motion and allowing you to catch it. In this example, the ball strikes the wall and the wall provides an equal and opposite reaction to send the ball back. This example demonstrates how the faster the player can move (accelerate) their stick, the more force the ball will arrive with at its target and the faster it will get there. STAAR Review Questions: 1) Newton's Laws apply to which of the following aspects of lacrosse? 2) Which of Newton's Laws apply to the mechanics of shooting a lacrosse ball? 3) What is the force called associated with Newton's First Law of inertia that keeps the ball in the pocket of the stick by rotating it in a circular motion? The pole that lacrosse players use to control the ball and play defense with. There is a head with mesh at the top of the stick that allows the player to hold onto the ball. The mesh is strung to the head in a way that forms to the ball, creating a "pocket" for the ball to sit in. The act of rotating the lacrosse sick using your wrist that creates centripetal force on the ball, keeping it pressed against the mesh and in the pocket of the stick. The act of hitting another players stick with the intention of knocking the ball to the ground so that you can scoop it and gain possession. Works Cited "The Physics Behind Throwing a Lacrosse Ball." LIVESTRONG.COM. N.p., n.d. Web. 08 May 2013. <http://www.livestrong.com/article/487887-the-physics-behind-throwing-a-lacrosse-ball/>. "Newton's Laws." Newton's Laws. N.p., n.d. Web. 08 May 2013. <http://www.unc.edu/~borbas/physics/Newtons_Laws.html>. "Amazing Lacrosse Goal Rips Net (David Planning)." YouTube. YouTube, 11 May 2010. Web. 08 May 2013. < "Newton's First Law." Newton's Laws. N.p., n.d. Web. 08 May 2013. <http://hyperphysics.phy-astr.gsu.edu/hbase/newt.html>. A) Passing B) Catching C) Checking D) All of the above A) First B) Second C) Third D) All three A) Centrifugal Force B) Centripetal Force C) Rotational Force D) Gravity