F = Ma

This simply means Force equals Mass times Acceleration.

Looking at it another way, Acceleration equals Force divided by Mass, or  a = F/M.

This means that if you push on a body it will accelerate, or move faster and faster.  The larger the force, the faster it accelerates, and the larger the mass the slower it accelerates.

How fast does it move?  Well here's another equation:  V = aT, or Velocity (speed) equals Acceleration times Time.

This simply means that the harder you push on something, and the longer you do the pushing, the faster it will wind up going.
 
 

E = Mc2

This is Einstein's famous equation.  It means that when Mass is coverted to Energy (through a nuclear reaction, for example), the energy released is equal to the Mass converted times the velocity of light squared.  Since the velocity of light is a very big number, and if you multiply it by itself, it is really, really big, a lot of energy is released.