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JesseLefler
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Blog Entries posted by JesseLefler
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After learning about Newton's 3rd Law, I thought about tug of war. I now know that when someone on one side of the rope is pulling on the rope, the force the person is applying to the rope and the force the rope is applying to the person are equal, no matter how hard the person is pulling. However, although the magnitude of the forces are equal, the direction of them are opposite, since the person is pulling the rope towards him/her and the rope is pulling away from the person. Also, I look can look at the net force between someone pulling on the rope with 200N and another person on the opposite end pulling with 100N. The net force of these two forces would be 100N towards the person pulling with a force of 200N. Lastly, due to the solution of the net force, this shows that the forces aren't at equilibrium because the net force isn't at zero.
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If you ever played any type of fighting game you've probably witnessed at some point in time that you are mashing every button to improve your chances of winning. The action of button mashing involves quite a bit of physics. For every push down of the button physics in involved, starting with the press of the buttons for each time you push the button down the button applies the same amount of force back onto your finger. That is called the normal force. Every time the button comes back up to its original position it is most likely due to the fact that there is some kind of spring involved. Springs are commonly involved in physics when dealing with forces. Overall I hope you learned something and maybe next time you're playing a fighting game or any type of game that involves the pressing of buttons you'll remember this little reading.
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Sir Isaac Newton, is said to be, the greatest English mathematicians of his generation. He laid the foundation for differential and integral calculus. His work on optics and gravitation make him one of the greatest scientists the world has known. Newton's laws of motion are three physical laws that form the basis for classical mechanics, and describe the relationship between the forces acting on the body and its motion due to these forces. Newton's laws affect every aspect of our life, therefore they affect volleyball, and every other sport, greatly. I'm going to inform you on just how the laws do affect volleyball. Newton's first law states that, " An object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by an unbalanced force." How does this affect Volleyball? : Newton's first law of motion affects every volleyball player who botches a serve and sends the ball snacking into the net. Every player who blocks a hard-hit ball from an opposing player feels the law's effect on her stinging arms. The server's hand, the net, and the blocker's forearms acted as an unbalanced force that stopped, or changed, the direction of the ball, the object in motion. Newton's second law states that, " The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the mass of the object." How does this relate to Volleyball? : Newton's second law of motion is a mathematical equation that explains the relationship between force, mass, and acceleration. Mass multiplied by acceleration equals net external force. A spiked volleyball creates a net external force that stings your hands when you stop it. But your hands hurt even more when you stop a ball hit by a different, stronger opponent. The harder-hit ball's higher acceleration rate results in a stronger net external force. Newton's third law states that, " To every action there is an equal and opposite reaction." How does this relate to Volleyball? : Newton's third law explains that every action creates a force that is met by an equal reaction force from the opposite direction. When two objects interact, they exert a force on each other. The action force of a spiked ball meets the reaction force of a player's block. A team scores a point when the action force of a spiked ball meets the reaction force of the opposing team's court. The hard floor has more force than the soft ball, so the ball bounces off the court to equalize the reaction of the impact. The next time you're playing or watching a game of Volleyball, think about all of the elements of physics involved. Without gravity, acceleration, velocity, work, and Newton's laws, Volleyball wouldn't be challenging at all.
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Work: Work is when a force moves an object. In Volleyball, the force is the player and the object is the ball. When the player hits, spikes, or serves the ball it moves in the direction in which the force has been applied. Hopefully, that direction will be over the net, when spiking or serving, and to the target when bumping. Velocity: Velocity is the speed of movement. You can figure out the velocity of a volleyball shot by dividing the distance your ball traveled by the amount of time it took to get there. So let's say you serve a ball across the net from the behind the serving line, 30 feet, and the ball takes 1.5 seconds to get across the net. To find the velocity you would divide 30 feet by 1.5 seconds, which would be 20 fps. So the speed of movement, or velocity, of your serve was 20 feet per second. The higher the velocity the tougher it is for your opponent to hit the ball back to you. Which means, the faster your ball is traveling the harder it is to return. Acceleration: Acceleration is an increase in velocity. Let's say you've just served the ball, it's gone over the net, and is falling to the ground. As gravity pulls the ball to the ground, it accelerates. If you gently lob the ball over the net and your opponent sends a hard spike back at you, that's another example of acceleration. The ball's velocity increased when spiked back over the net, by your opponent, therefore it accelerated.
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Gravitational force, or the force of attraction between an object and the Earth, has an impact on every element of Volleyball. Whether you are serving, bumping, or spiking, gravity will affect every interaction you have with the ball. Spiking: When you spike a volleyball, you have the opportunity to deliver a crushing offensive blow to your opponent. When spiking, you exert a downward force on the ball so that it falls rapidly on the opponent's side of the court, making it very difficult for your opponent to return the ball. Gravity works in your favor when you spike, because it also exerts a downward force that makes the ball fall to the court floor. For this reason you do not necessarily have to exert tremendous downward force to spike effectively, because gravitational force is also acting on the ball in the same direction. Digging: When digging a volleyball, you are exerting a sharply upward force to prevent it from hitting the ground. However, gravity is exerting a downward force on the ball, and if you do not account for this you will not hit the ball high enough to prevent it from hitting the ground. To account for this, bend your knees low to generate force with your legs, when digging. This will ensure that you hit the ball high enough for your teammates to get in position.
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