Potential energy? def+exmp+explain
kinetic energy? def+exmp+explain
equilibrium? def+exmp+explain
state of equilibrium? def+exmp+explain

Types of Mechanical Energy

There are two types of energy: potential and kinetic.

Potential energy is energy that is stored in an object due to its position. This type of energy is not in use but is available to do work. For example, the book possesses potential energy when it is stationary on the top of the bookshelf.

Ep=m*g*h (m - mass, g - gravitaional acceleration (Earth mean value g=9, 81 m/(s2), h - height from the zero or referent level) s2=s*s

Kinetic energy is energy that is possessed by an object due to its motion. For example, if the book were to fall off the shelf, it would possess kinetic energy as it fell. All energy is either potential or kinetic.

Ek=(m*v2)/2  v2=v*v

The law of the conservation of energy states that energy is neither created nor destroyed. Instead, it is simply transferred from one type of energy to another, or from one form of energy to another. The difference between mechanical energy and kinetic energy is that kinetic energy is a type of energy, while mechanical energy is a form of energy.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.