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Transcript of Dodgeball
Mat Dutile Dodgeball
Players. Obstacle 2 Friction Sources Who invented it? I chose this sport because I felt it accurately demonstrated Newton's three laws and served as a great sport to pull friction examples from. http://www.georgiascorchers.com/ What do sports have
to do with it? Why was this sport chosen? Dodge ball Augustus Hagerson from Africa invented dodgeball in 1832. Some say it dates back to B.C. and Augustus just modernized it, although there is no proof of that, so it is the common knowledge that Augustus was the inventor. Equipment: Comfortable clothes and shoes
Something to divide the court Why is friction important? Without friction on your shoes would slide all over the floor
Without friction between your hands and the ball you would be constantly be dropping the ball.
Friction makes the ball slow down when it hits the opponent. What types of friction are involved? Sliding Friction- Sliding friction occurs when two objects slide over one another. (ex: the ball hitting an opponent and sliding off their shoulder, or a person sliding in the game to duck down from the ball. )
Fluid Friction- Fluid friction occurs when a object moves through either a liquid or gas. (ex: The ball flying mid-air.)
Rolling Friction- Rolling friction occurs when an object rolls over another (ex: The ball rolling on the ground.) How is friction increased or decreased in this sport? Friction decreases as velocity increases, therefore there will be less fluid friction as the ball goes from being still to being thrown towards the opponent.
Friction increases as velocity decreases so there will be more sliding friction when the ball hits your opponent. What is friction? Friction is a force that resists sliding motion between surfaces that are touching. Simple Machines A simple machine is a tool that changes either the direction or magnitude of a force. What is a simple machine? Simple Machines in dodge ball: Third class lever: A third class lever is where the fulcrum is on the opposite side of the resistance and the effort in the middle. (ex: elbow, forearm, and ball.)
Wedge: A wedge is a simple machine used to push two objects apart. A wedge is made up of two inclined planes. These planes meet and form a sharp edge. (ex: your teeth that are slamming together while you're chewing out smack talk.) Newton's Laws Teams and Stats: We have a local Dodge ball team named, "The Georgia Scorchers." The team was created in 2003 and is still playing hard.
They have five members at the moment. They also have Dodgettes, their own personal cheerleaders. Forces What is a balanced force? A balanced force is when all the forces acting upon an object are equal to zero. The ball being still/caught
When the balls are on the ground. What is an unbalanced force? An unbalanced force is when one force acting upon an object is higher than other forces acting on the object; therefore not equaling zero and creates an "unbalanced" equation. What are some examples of unbalanced forces in dodge ball? When you throw the ball, the force on the ball in one direction is out of balance with the force of the ball in the opposite direction therefore creating an unbalanced force.
When you're running, wind resistance and gravity are acting against your body, but the movement of your muscles overpowers these forces causing an unbalanced force that allows you to run and accelerate across the court. What are some examples of balanced foreces in dodge ball? Newtons First Law "The Law of Inertia": "An object at rest remains at rest and an object in motion remains in motion in a straight line at a constant speed unless acted on by an unbalanced force." Newtons Second Law (F=M*A): Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). For every action there is an equal and opposite re-action. Newtons Third Law: Calculations Speed: S= d S= 15 ft S= __ ____ 3.95 ft/sec t 3.8 sec Velocity: v= speed + direction v= 3.95 ft/sec + straight The ball will accelerate forward at a speed of 3.95 ft/sec. Acceleration: A= Fv-Iv/t A= 0 ft/sec-3.95 ft/sec A= __________________ 3.8 sec -1.03 ft/sec/sec http://www.physics4kids.com/files/motion_laws.html http://schooltutoring.com/help/forces-types-of-friction/ The larger the ball and the weaker I am the more force I will have to apply to the ball in order to get the same effect. This picture is me holding the ball and the other picture is me throwing the ball. This is the unbalanced force that creates the movement. The ball hits a person in the face and then bounces off.