Types of Energy and Waves

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Types of Energy and Waves Mr. Hollander’s 8 th Grade Science Class

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Types of Energy and Waves. Mr. Hollander’s 8 th Grade Science Class. What is Energy???. Energy is defined as the ability to do work or cause change Work is done when a force causes an object to move in the direction of that force - PowerPoint PPT Presentation

Transcript of Types of Energy and Waves

Types of Energy and Waves

Types of Energy and WavesMr. Hollanders 8th Grade Science Class

14/30/14Mr. H's 8th Grade Science ClassTypes of Energy and WavesWhat is Energy???

Energy is defined as the ability to do work or cause changeWork is done when a force causes an object to move in the direction of that forceExamples: Pushing a book off of the table is work and energy allows this work to take placeEnergy is all around us all of the time being harnessed and expressed in different ways

Kinetic and Potential EnergyKinetic energy is the energy of motion and/or movementThis is dependent on the mass and speed of an objectNote: Speed has more of an effect Potential energy is energy that is stored and has the potential to do somethingThere are three types of P.E.Elastic Rubber band pulled backGravitational Raising an object off of the ground (height & mass)Chemical A log being placed on a fire

Types of EnergyMechanical The total kinetic and potential energy of motion and position of an objectThermal The kinetic energy due to random motion of the particles that make up an object (Temperature and Number of Particles)Chemical The potential energy of a compound that changes as its atoms are rearrangedElectrical The potential or kinetic energy of charged electronsSound The kinetic energy caused by an objects vibrationsLight The kinetic energy caused by the vibrations of electrically charged particlesNuclear The potential energy caused by changes in the nucleus of an atom

Conservation and Conversion of EnergyConservation of Energy is the idea that energy is not created or destroyed, but it can only change formsEnergy conversion explains this change from one form to another and happens all around useverydayall the time!!!Example: A car uses chemical energy in a battery to create electrical energy to power an electric starter motor. This motor uses the electrical energy to create mechanical energy to start a vehicle. The vehicle converts chemical energy into mechanical energy to make the vehicle go.

What are Waves???Waves are a disturbance which transfer energy from one point to another with little or no transfer of matterThere are several parts of a wave:Crest The section of the wave above the undisturbed portionTrough The section of the wave below the undisturbed portionAmplitude The positive and negative amount of energy due to the disturbanceWavelength The distance between any two corresponding positionsCrest to Crest, Trough to Trough, Cycle to CycleCycle Start of the crest to the end of the troughPeriod The time of one complete cycle

Mechanical & Electromagnetic WavesMechanical WavesRequire a material medium to travel (air, water, ropes, etc.)Three types of M.W.Transverse; Up and Down(Pebble in a Pond)Longitudinal; Side to Side(Sound)Surface; Both transverse & longitudinal(Earthquakes)Electromagnetic WavesDo not require a material medium to travel(Light, Radio, Gamma)

Summing It All Up!!!Energy is defined as the ability to do work or cause changeKinetic energy is the energy of motion and/or movement (mass and speed) and potential energy is energy that is storedThe conservation of energy is the idea that energy cannot be created or destroyed but can only change formsThere are several types of energy; mechanical, thermal, chemical, electrical, sound, light and nuclear, this is constantly being converted from one form to another due to energy conversionWaves are a disturbance which transfer energy from one point to another with little or no transfer of matterMechanical waves require a medium in which to travel and an electromagnetic wave does not require a medium

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