9.3 What Is Energy?

-Energy

*Can be defined as the ability to do work. *Work can be thought of as the transfer of energy from one system to another. Units: J or Joules

Kinetic Energy: -Electromagnetic Radiation

*Energy is carried on waves. Examples: -Gamma Ray -X-Ray -Ultraviolet (Sunlight) -Visible (Eyes) -Microwave -Radio

Potential Energy: -Gravitational Energy

*Energy resulting from an object's position compared to something. Examples: -Waterfalls

Potential Energy: -Elastic Energy

*Energy stored in a elastic material. Examples: -Spring -Bungee Cord -Rubber Band

Energy: -Non Mechanical Energy

*Energy that does not affect motion on a large scale. *Energy at the molecular level.

Kinetic Energy: -Electricity

*Flow of charged particles (Electrons) *Increases the temperature of wire. *Creates magnetic field. *Both can do work.

Kinetic Energy: -Thermal Energy (Heat)

*Heat refers to the kinetic energy of the particles in a system. *Higher Temperature=More kinetic energy.

Potential Energy: -Nuclear Energy

*Potential energy stored by the nucleus force holding particles together in the nucleus. *Mass is converted to energy according to E=mc(2)

Potential Energy: -Chemical Energy

*Potential energy stored in chemical bonds. *Breaking & forming bonds involves changes in energy. Exothermic Reaction: Potential energy deceases. Endothermic Reaction: Potential energy increases.

Kinetic Energy: -Sound

*Sound waves are produced by vibrating objects. *Waves carry energy. *High Pitched sounds carry more energy.

Energy: -Mechanical Energy

*The total amount of kinetic & potential energy of a system. *Large scale

-Kinetic Energy

The energy of a system due to its motion.

-Potential Energy

The stored energy resulting from the position or makeup of a system.