Well, my friends. We all know what is the definition of potential energy, right? Potential energy is simply the energy stored in a position of not being active but what about kinetic energy? Don't worry. It's not as hard as you may think it is.

"Results always arise from kinetic energy, not potential." - Kevin W. Courington

Define Kinetic Energy.

Kinetic energy is the energy of the opposite of a inactive position: motion. Any object that contains a mass and is moving has kinetic energy being made. An example would be throwing a tennis ball to a friend of yours. The mass is the mass of the object in movement: the tennis ball and the speed it travels to your friend's hand is the velocity.

Easy as that.

The two elements of this energy is nothing but mass and velocity. Velocity being the speed of movement and mass being the individual object's mass (that's moving. The velocity is the one element in its equation the affects it the most due to it being squared.

In tennis, kinetic energy can be displayed when you serve to your opponent with the tennis ball moving at quick velocities.

http://www.britannica.com/EBchecked/topic/318130/kinetic-energy

Here's a article for more information.

Watch a video.