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# Newton´S Three Laws Of Motion Essay

2121 words - 9 pages

Physics is involved in everyday life and can be an essential explanation for how things work. Being a lacrosse goalie involves physics concepts and proves how they apply to every movement that is made on the field. To better understand the physics of a goalie, you must understand how Newton’s Three Laws of Motion work; Inertia, force equals mass times acceleration, and equal and opposite forces, as well as another law torque and leverage.
The first law of Newton’s Laws is inertia. The basic definition of inertia is an object in motion will stay in motion until acted on by an outside force, as well as an object as rest will stay at rest until acted on by an outside force (Serwalt, ...view middle of the document...

When the ball is on the ground a player is allowed to kick the ball to their advantage to pick up the ball with their stick. Kicking the ball will only help keep it in motion until the player decided to scoop the ball with their stick. Scooping the ball with your stick will help bring it back to rest.
The ball isn’t the only object in the field that is proves this law of inertia. The players, goalies specifically, prove that an object in motion will stay in motion until acted upon. (Borbas, 2014). When the ball is being cleared and is coming to the goalie, the goalie will be in a ready stance. This stance will have the player in a slight squat with legs a little over shoulder width and having your arms up holding the stick parallel to the goalies body. Being in that stance is like cranking back a spring, and when the player shoots the ball the goalie will explode out to the shot and most likely stop or save the ball. This whole time the goalie is in the stance and is moving around waiting for the perfect opportunity to stop the shot. Even though the goalie seems to not have much movement in the stance, they are still moving. The force that is causing them to move is the attack player with the ball, since they are a threat to scoring. Also, the force that causes the goalie to stop moving is if the goalie saves the shot then takes a moment, four seconds to be exact, to relax and wait for their players to set up and be ready for a clear. Once again the goalie is put back into motion because of an outside force, a defender that is open for a pass, and will clear the ball. Once the ball is over half filed then the goalie goes back to rest since there is no attack man that is a threat, and that’s the force that causes the goalie to stay at rest. Another way that would cause the goalie to stop moving would be if the player scores or the referee blows the whistle to stop the play.
Since a ball being in motion will stay in motion till acted on, it only makes sense that when a ball is at rest then the ball will stay at rest till an outside force acts upon it. When a player is cradling the ball, an act of rotating your stick side to side to keep the ball in your stick, the ball is in motion. When a player just holds the stick still, either waiting for a play to set up or looking for a pass, the ball it at rest. Whenever the ball is not moving it is not in motion. The only way the movement of the ball will change is if the player passes the ball to another player or a player from the opposing team is to check sticks. The most common way to have the ball be acted on is if the player drops the ball by cradling to hard or not at all. The outside force acting on the ball is Fg (the force of gravity) and the way the player is cradling the ball. The point of a cradle is to have Fg help keep the ball in the stick, but if the player is out of control with the cradle it will work against the player.
Following up with Newton’s second law, acceleration that is...

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