Sub-topics include:

Subsection i) The Nature of Energy
Defining energy

Subsection ii) Types of Energy
Linear kinetic energy
Rotational kinetic energy
Chemical energy
Strain potential energy
Electrical energy
Gravitational potential energy
Other types of energy

Subsection iii) Energy Transfer
Introduction
Energy transfer
Energy transfer in different objects

Subsection iv) Efficiency of Machines
Introduction
Calculating efficiency
Sankey diagrams