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.
