Motion of a ball falling

This video represents the motion of a ball falling to the ground.  The motion is represented by -mg where m is the mass of the ball and g represents gravity (9.8m/(s^2)).  As the ball is dropped from reset, it slowly starts to fall at first, then picks up speed faster and faster until it hits the ground.  

This can also be represented by potential and kinetic energy.  Conservation of energy says that energy cannot be created or destroyed.  This means that As potential energy decreases, kinetic energy increases.  At the top before the ball is dropped,  this is the point of maximum potential energy.  The ball has no velocity or acceleration, so the kinetic energy at this point is 0.  As the ball is dropped, the velocity and acceleration of the ball increases causing it to have kinetic energy so the potential energy decreases.