The Law of conservation of energy
The Law of Conservation of Energy states that energy can neither be created or destroyed. The sum of all energies in a system remains constant. In Volleyball the Law of Conservation comes into play in almost every aspect. From the moment a hitter approaches to make an attack to the moment the ball hits the floor after the attack is made, without energy volleyball wouldn't be possible. *Remember ΔEnergy is equal to Work
Questions
To calculate the power of something, you can use the equation P=ΔE/ΔT
E.g. If Malik spikes the volleyball and does 27J of work on it in 0.2 s, what is his power?
P= 27/0.2
P= 135W
E.g. If Malik spikes the volleyball and does 27J of work on it in 0.2 s, what is his power?
P= 27/0.2
P= 135W
We can calculate the potential gravitational energy of an object by using the equation MxGxH; where M=mass, G=gravity, and H=height
E.g. If Malik serves a 0.26kg volleyball from a height of 2.5 m, what is it's potential gravitational energy?
Gravity (On Earth) = 9.8 m/s^2
Eg = MxGxH
Eg = 0.26x9.8x2.5
Eg = 6.37
∴ The potential gravitational energy of the volleyball is 6.37J
To calculate the *Kinetic energy of an object you need to have velocity, once you have the velocity and the mass you can sub these values into the equation MxV^2/2.
E.g. If Malik were to serve the ball from the same height at a velocity of 20m/s what would the balls kinetic energy be?
Ek = MxV^2/2
Ek = 0.26x20^2/2
Ek = 2.6
∴ The volleyballs kinetic energy is 2.6 Joules.
* Energy total is equal to the Eg + Ek so in this instance the balls total energy would be 8.97 J
Always remember that energy can neither be created nor destroyed, meaning that no matter what height the ball is, or what velocity, its energy total must remain the same!
E.g. If Malik serves a 0.26kg volleyball from a height of 2.5 m, what is it's potential gravitational energy?
Gravity (On Earth) = 9.8 m/s^2
Eg = MxGxH
Eg = 0.26x9.8x2.5
Eg = 6.37
∴ The potential gravitational energy of the volleyball is 6.37J
To calculate the *Kinetic energy of an object you need to have velocity, once you have the velocity and the mass you can sub these values into the equation MxV^2/2.
E.g. If Malik were to serve the ball from the same height at a velocity of 20m/s what would the balls kinetic energy be?
Ek = MxV^2/2
Ek = 0.26x20^2/2
Ek = 2.6
∴ The volleyballs kinetic energy is 2.6 Joules.
* Energy total is equal to the Eg + Ek so in this instance the balls total energy would be 8.97 J
Always remember that energy can neither be created nor destroyed, meaning that no matter what height the ball is, or what velocity, its energy total must remain the same!