PS Ch. 15 - Energy and EMS
Energy is continuously converting between many different forms. During these conversions, energy is never created or destroyed, and the total energy of a closed system is always constant. "The Conservation of Energy" is the underlying law of the universe.
15.1 Energy and its Forms
Work is the transfer of energy. The kinetic energy of any moving object depends on its mass and speed. An object's gravitational potential energy depends on its mass, its height, and the acceleration due to gravity. The major forms of energy are mechanical, thermal, chemical, electrical, electromagnetic, and nuclear.
15.1 KE and PE.mp4ONLINE RESOURCES
BrainPOP - Kinetic Energy (2:28)
BrainPOP - Potential Energy (2:39)
BrainPOP - Forms of Energy (1:52)
15.2 Energy Conversion and Conservation
Energy can be conserved fro one form to another. The law of conservation of energy states that energy cannot be created or destroyed. The gravitational potential energy of an object is converted to the kinetic energy of motion as the object falls. Einstein's equation shows that energy and mass are equivalent, and can be converted into each other.
Waves, Electromagnetic Spectrum and Photosynthesis (Ch 18)
Electromagnetic waves are produced when an electric charge vibrates or accelerates. EM waves can travel through a vacuum as well as through matter. The speed of light in a vacuum (c) is 3.00 x 10⁸ m/s. EM waves can vary in wavelength and frequency. The electromagnetic spectrum includes radio waves, infrared waves, visible light, ultraviolet rays, X-rays, and gamma rays. EM waves are used in communication, medicine, and industry.
ONLINE RESOURCES
BrainPOP - Electromagnetic Spectrum (3:58)
BrainPOP - Light (2:23)
BrainPOP - Photosynthesis (2:01)
BOOK (pdf): NASA's Tour of the Electromagnetic Spectrum