The Relationship between Volleyball and Physics
Hey science nerds! Believe it or not, volleyball is an awesome way to brush up on
your physics material. But what on earth could volleyball and physics have in
common? Instead of the standard method of reading concepts and equations in a
textbook, volleyball allows you to see it in real time. Not to mention,
understanding the physics behind the game will put you at a huge advantage on
the court. “The Science of Volleyball” gives us some solid insight into how this all
works together.
GRAVITY
Serving: A server exerts an upward force on the ball, while gravity exerts a
downward force on the volleyball. To assist gravity, you can snap your wrist
which adds top spin that skids over the ball as you serve. This spin creates pressure
difference above and below the ball, causing the ball to fall quickly on the
opponent’s side after clearing the net.
Digging: Digging requires you to exert a sharp upward force. If you do not account
for gravity’s downward pull, you will not hit the ball high enough to prevent it
from hitting the ground. So, bend your knees low to generate force with your legs.
This will ensure that you hit the ball high enough for your teammates to get in
position (Not to mention it will also protect your joints).
Passing: Because gravity exerts a downward force on the ball, if you do not
compensate for this, your target player will not have time to set underneath the
ball before it hits the ground. To account for the force of gravity, follow through
fully with your forearm when exerting force on the ball, over a longer period of
time.
Spiking: To spike is to crush…down. Gravity also crushes…down, thus working
in your favor. 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.
NEWTON’S THREE LAWS OF MOTION
1. An object at rest will remain at rest unless acted on by an unbalanced force. An object
in motion continues in motion with the same speed and in the same direction unless acted
upon by an unbalanced force.
— As a volleyball player, the server’s hand, the net, and the blocker’s forearms
act as that unbalanced force that stops or interferes with the balls course of
motion.
2. 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.
— 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.
3. To every action there is an equal and opposite reaction.
— 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.
Get out there and do something good for your game. Touch the ball every day
and work harder than everyone else and you will be the best!