Energy is commonly defined as the capacity to do work or to transfer heat.
Work is energy used to cause an object with mass to move.
Heat is energy used to cause the temperature of an object to increase.
Kinetic energy is the energy of motion, represented by the equation:
Ek = 1/2 mv2
Atoms and molecules have mass and are in motion,
Potential energy is energy of position, based on the relative position of one object with another.
therefore they have kinetic energy.
Gravitational potential energy is represented by the equation:
Ep = mgh
Gravity, near the surface of the Earth, accelerates all objects at a rate equal to the gravitational constant, g, 9.8 m/s2.