Physics Chapter: Energy, Work, and Refraction

Light and Mediums

• When light passes from one medium to another of different optical density, it changes direction, a phenomenon known as refraction.

Energy Principles

• The fundamental principle that states energy cannot be created or destroyed, only converted from one form to another is known as the Law of Conservation of Energy.

Energy Efficiency

• The ratio of the output energy to the input energy of a system is known as efficiency.

Work and Energy

• The ability to do work is defined as energy.
• The transfer of energy from one object to another through a force applied over a distance is known as work.