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# Biomechanics of a Volleyball Serve

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by on 5 December 2013

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#### Transcript of Biomechanics of a Volleyball Serve

Biomechanics of a Top Spin Overhand Volleyball Serve

Proper Technique for a Top Spin Overhand Serve
Overhand Top Spin Serve Technique
Difference in Phases
Biomechanical Mechanisms Involved
Conclusion
Expert Video
Experienced Player
Inexperienced Player
Newton's Second Law
Force=mass * Accceleration

When an object, such as a ball, is struck, it tends to travel in the direction of the line of action of the applied force
Magnus Effect
-When you strike the ball, there is a lift force produced on the spinning ball
-When you serve the volleyball, you want to use top spin so that the ball stays low and is difficult to retreive.
-Topspin makes the ball reach the groud quickly, while back spin makes the ball go higher and reach the ground slower
-a top spin volleyball serve enhances the lift force in the direction of the spin [i.e., ascent phase (forward and downward), mid-flight (downward) and descent phase (backward and downward)] while decreasing the drag forces encountered in flight. Imparting spin to a projectile to cause a lift force in a desired direction is referred to as the Magnus effect.
Phase two: Back Swing
Phase 3: Contact with Ball/ foot drag
Toss, Step, Drag
Moment of Inertia
Contacting the ball at arm's reach
Moment of Inertia is the body's tendency to resist angular acceleration
Allows for a longer leaver, which increase moment of inertia by increasing the force upon which the arm can be accelerated throughout the serve
Base of Support
the location on a body where most of the weight is supported
Standing with feet shoulder width apart allows for the most beneficial base of support, creating the most balanced position
Standing with feet closer together makes the base of support too small leading to a less balanced position
Standing with feet farther apart makes the base of support too large, also leading to an unbalanced position
Conservation of Momentum
The momentum of the system (the body and the ball) is conserved throughout because part of the initial momentum of the body is transferred to the ball upon contact
The momentum produced by the body at the initiation of the serve is conserved through the completion of the serve.
As the ball is contacted, part of the body's initial momentum is transferred to the ball.
Though the body does not maintain all of its initial momentum, the total momentum is conserved through the transfer of momentum from body to ball upon contact
Starting Position
Stand with feet shoulder width apart; the left foot should be slightly in front of the right
Hold the ball in left hand
Right arm should be pulled back, with hand next to ear and elbow should ALWAYS remain above the shoulder
Serving Position
Toss ball straight up in the air about a foot and a half
As ball reaches its peak, step forward with left foot
Contact the ball at full arm's length with the heel of the hand, and a firm wrist
Finishing Position
Upon contact with the ball, snap wrist and "drag" right foot until even with the left foot
Continue arm swing util arm is slightly hyperextended behind the torso
Proper technique
Comparison of Expert, Intermediate, and Beginner servers
Biomechanical Mechanisms involved in overhand serving

Impact
-Collision and exchange of force during short time interval.
-the velocities of two colliding bodies before and after impact bear a constant relationship.
-Kinetic energy is transformed into deformation, sound, heat, and other forms of energy.

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