What is gravity?
Earths's gravity acts downward toward the center of Earth. Also the the force of gravity is the force with which the earth, moon, or other massively large object attracts another object towards itself.
How does gravity affect the movements of volleyball?
Gravity impacts and affects all aspects of volleyball. This force greatly affects the ball's movement in the air during the entire game. For example, when serving the ball gravity helps it come back down to the server to hit over the net. Also this force is involved in setting, free balling, or just passing. The ball is pushed down by gravity to your arms or hands. Also if there were no gravity while digging, you wouldn't be able to stay down to dig it when you wanted to.
Affect of Gravity in a Serve
Force on the volleyball serves
Some forces when serving with a topspin is Magnus force, applied force, and frictional forces. The top of the ball spins into the air and the front of the ball will move downwards. Because of the boundary layer, the air will drawn down along with the front of the ball. This gives it more air to gets pulled under the ball than air going above it. Now, since more air has to pass under the ball it gets squashed together and moves faster. This means there needs to be a higher velocity on the lower side of the ball, and a lower velocity on the top of the ball. As the ball goes through top-spin , it causes the velocity of the air around the top half to become less than the air velocity around the bottom half. This is because the tangential velocity of the ball. The air speed around the top half of the ball is less than the air speed around the bottom half of the ball, so the pressure is greater on the top of the ball. This is what causes a net downward force to act on the ball.
Some forces when serving with a topspin is Magnus force, applied force, and frictional forces. The top of the ball spins into the air and the front of the ball will move downwards. Because of the boundary layer, the air will drawn down along with the front of the ball. This gives it more air to gets pulled under the ball than air going above it. Now, since more air has to pass under the ball it gets squashed together and moves faster. This means there needs to be a higher velocity on the lower side of the ball, and a lower velocity on the top of the ball. As the ball goes through top-spin , it causes the velocity of the air around the top half to become less than the air velocity around the bottom half. This is because the tangential velocity of the ball. The air speed around the top half of the ball is less than the air speed around the bottom half of the ball, so the pressure is greater on the top of the ball. This is what causes a net downward force to act on the ball.
Momentum
Momentum is the quantity of motion that an object has and is measured as the product of its mass and velocity.
When the ball comes speeding toward a defender, it contains a very high momentum. If the defender used her platform and passed the ball just standing there, the ball would go straight back over the net and most likely go out of bounds. The best way a defender can control the ball coming towards her is by absorbing the momentum. They would do this by “breaking” their platform, which means cushioning the impact of the ball. Then when the ball hits her, the defenders mass is so much greater than the ball’s, that her velocity will barely change, and neither will the ball's. If the defender is to move backwards away from the ball, or if her platform is at least, the ball will have a decreased velocity and is less likely to overpass.
There is also momentum when the player does jump serves or spikes. In both these techniques the player jumps into the air to gain as much momentum possible. This create them more motion, which will help increase the force used on the ball, especially during a spike. For serving they have to be carful with the amount of momentum because there are other factors involve in making a good jump serve such as the the velocity.
When the ball comes speeding toward a defender, it contains a very high momentum. If the defender used her platform and passed the ball just standing there, the ball would go straight back over the net and most likely go out of bounds. The best way a defender can control the ball coming towards her is by absorbing the momentum. They would do this by “breaking” their platform, which means cushioning the impact of the ball. Then when the ball hits her, the defenders mass is so much greater than the ball’s, that her velocity will barely change, and neither will the ball's. If the defender is to move backwards away from the ball, or if her platform is at least, the ball will have a decreased velocity and is less likely to overpass.
There is also momentum when the player does jump serves or spikes. In both these techniques the player jumps into the air to gain as much momentum possible. This create them more motion, which will help increase the force used on the ball, especially during a spike. For serving they have to be carful with the amount of momentum because there are other factors involve in making a good jump serve such as the the velocity.