Chemical, Gravitational Potential, Kinetic, Heat, Sound etc
potential energy is changed to kinetic energy when you push.
physical energy
Yes. Chemical energy, changed to heat energy, changed to mechanical energy.
Stored energy is typically changed into kinetic energy or thermal energy when it is used.
Heat energy can be changed into other forms of energy such as mechanical energy, electrical energy, or light energy through processes like thermoelectric conversion, thermodynamic cycles, or combustion.
Some energy is changed into the desired form. The rest is changed into undesired form such as heat, light, sound, etc.
potential energy
To know what sort of energy is being changed, we need to know what is doing the changing. If your asking what stored energy is being changed into mechanical energy, that answer is potential energy.
chemical energy
When lighting a light bulb, it is changed into light and heat/thermal energy.
Yes
Yes it can.