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# The Physics of Sports : Volleyball

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on 2 November 2012

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#### Transcript of The Physics of Sports : Volleyball

The Physics of Sports Volleyball By : Madeline Bazley How do potential and kinetic energy apply to volleyball? A ball held in the air being ready to be served, has more potential energy then a ball held at the waist
When someone does an approach, they are trying to change kinetic into potential
Potential-having the potential to hit the ball hard, Kinetic- Taking the approach
Kinetic-During an approach (for a hit or serve)
Kinetic-If someone stopped, they wouldn't be able to jump as high How does friction influence movements in volleyball? Whenever you touch the ball
When you dive for the ball
The shoes, have a "stickier" sole, and make it easier to move How does gravity influence movements in volleyball? Serving, the ball wouldn't come back down without it
Passing, whether it's setting, free balling, or just passing, the ball is some how pushed down to your arms/hands (gravity), and when you touch it, it has to come back down somehow
Hitting, the ball would just keep going up after it hit the ground
Digging, you wouldn't be able to stay down to dig it, and the ball would keep going up after it was hit How do balanced and unbalanced forces influence movements in volleyball? Unbalanced force: Doing your approach for a hit, you put more power to push off the ground, than the ground is pushing up on you
Unbalanced force: When you hit the ball, you put more force on the ball than it is putting on your hand
Balanced force: When the ball hits the ground, for that like half a second when the ball touches the ground and it's still, the ground has the same force up to the ball, that the ball put to the ground
Balanced Force: When two people go to tip the ball at the same time with the same force, they're bothing putting the same force to the ball, so it doesn't move Newton's First Law (Inertia) in volleyball First law states " If an object experiences no net force, then its velocity is constant: the object is either at rest (if its velocity is zero), or it moves in a straight line with constant speed (if its velocity is nonzero)."
When someone serves the volleyball, the ball is still until someone hits it
The ball is still, until someone throws it up, and hits it
The net won't move unless a player or ball goes into it Newton's Second Law Second law states "The acceleration a of a body is parallel and directly proportional to the net force F acting on the body, is in the direction of the net force, and is inversely proportional to the mass m of the body, i.e., F = ma."
A heavier ball with more acceleration, has more force than a light ball with little aceleration F=ma Force of an average Female Jump Serve M=0.226 kilograms, weight of the volleyball
A=13.2 meter/second^2, average speed hit
.226 * 13.2 = 2.9832 newton
Many volleyball players can hit balls harder, but they usually don't serve hard because they are just trying to keep the ball in play Newton's Third Law (Action-Reaction Forces) Third law states: "When a first body exerts a force F1 on a second body, the second body simultaneously exerts a force F2 = −F1 on the first body. This means that F1 and F2 are equal in magnitude and opposite in direction."
When you pass the ball, the ball is getting force by gravity and the motion you are using to push it forwards
When two people go to tip the ball, two people are putting force on one ball
When you block it, you are putting force against a ball that is coming a your hands with a lot of force
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