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# Energy - Science 7

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## keiko farah

on 19 December 2013

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#### Transcript of Energy - Science 7

Presentation by Keiko Farah + Maya Guevara Energy What is energy? Energy is the
ability to do work. There are several types of energy. Conduction: the transfer of heat through particles.
Example: a spoon in a hot drink will become hot after sitting in the drink for a while. Convection The energy that is stored in chemical bonds. Chemical Energy Bibliography; Websites Kinetic Energy Potential Energy Thermal/Heat Energy Chemical Energy Electrical Energy Light Energy Nuclear Energy Sound Energy Law of Conservation of Energy This law states that energy can not be created or destroyed; only changed in the form it takes. Kinetic and Potential Energy Kinetic Energy: the energy of motion. Potential Energy: the energy of position or shape. There is a skier at the top of a mountain. Right now, he only has potential energy. The skier looks down the mountain, and starts skiing down. He is now in motion, and his potential energy is changing into kinetic energy. Example of kinetic and potential energy (also law of conservation of energy): Convection: the transfer of heat through movement of the heated matter.
Example: if you cook macaroni in a pot of water, the macaroni will rise and fall because of how hot or cold the pasta is. Sound waves can be described as sinusoidal plane waves, which can be characterized by these properties: Sound Energy Radiation: electromagnetic waves that directly convey energy through space.
Example: the sun has radiation that transports heat to Earth. Wavelength
Wavenumber
Frequency
Amplitude
Sound intensity
Sound pressure
Speed of sound
Direction Conduction Radiation A sound wave is a chain of vibrating molecules The pitch of a sound is from the wave lengths frequency. Electromagnetic Spectrum
Properties:

Speed: 299, 792 km/s
Speed: Fastest in a vacuum
Light bends as it goes through different mediums
Light spreads as it passes through openings (diffraction property).
Two light waves can reinforce or cancel each other out (interference property). Light Energy A name for a lot of types of radiation. The term is used when you want to talk about all of them as a group. Types of radiation on the electromagnetic spectrum in order from least to greatest:
Microwaves
Infrared
Visible
Ultraviolet
X-rays
Gamma-rays Sources:
voice, car honking, a radio, siren, musical instrument. Wavelength-the distance between points of two waves. Properties Octave-An octave is where there are two points and the second point is two times higher in frequency than the first. Light is a form of electromagnetic
radiation that the naked eye can see. Artificial Sources:

matches and lamps. Natural Sources:

the sun, stars, meteors, fireflies. Frequency-How often air particles vibrate. Amplitude-The intensity or how much power the sound has. If a wave is short, it has a higher frequency. The higher frequency something has, the more energy it contains. So gamma rays have more energy than a radio. “Introduction to the Atmosphere.” Ucar. n.p., n.d. Web. 28 Sept. 2012

“Microwaves.” Samsung. SAMSUNG., 1995. Web. 27 Sept. 2012

“Rancho Cucamonga CA Central Air Conditioning Systems-Units.” Fire-N-Ice.Firenicehvac.2010.Web.29 Sept.2012

“Fire and Ice.”DeviantArt.DeviantArt,Web. 29 Sept. 2012

“When fire and ice collide.”ConfessionsofacertifieddramaQueen.Wordpress,Web.29 Sept.2012. Bibliography;
Images “How Does the Amplitude of an Electromagnetic Wave Affect Its Energy.” Quora. n.p., n.d. Web. 28 Sept. 2012

“What is Amplitude?” Indiana. Prof. Jeffrey Hass., 2003. Web. 26 Sept. 2012

“Sound.” Physics Classroom. The Physics Classroom., 1996-2012. Web. 28 Sept. 2012

“Light Energy.” What Is Light Energy. What Is Light Energy., 2012. Web. 26 Sept. 2012

“Sound.” Brainpop. BrainPOP., 1999-2012. 27 Sept. 2012

“Temperature Phenomena.” Faculty. n.p., n.d. Web. 28 Sept. 2012

“Volcanic Heat.” Geo. n.p., n.d. Web. 26 Sept. 2012 Heat tranmission is conduction, convection, and radiation. Energy likes to move around. If there were a pot of boiling water, the molecules would be moving around really fast. Then, celery that has just been in the freezer, is put into the pot. While the celery was in the freezer, the molecules were moving slowly, but when it was placed in the pot, the molecules started moving faster causing the temperature of the celery to rise. Heat Transmission Sources could include a radiator, a fan, and a frying pan.
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