2What light is VS. What light isn’t Light is bright rays.Light isn’t dark.Light is a type of matter, something like plasma.Light isn’t solid.Light is streams of invisible, tiny particles, like radiation.Light isn’t made up of matter because we can’t feel it.Light is a beam of energy.
3Luminous means these objects can produce or give out their own light Sources of LightLUMINOUSREFLECTEDLightbulbMirrorsFireRoad signsLightningMovie screenGlow sticksMoonLuminous means these objects can produce or give out their own light
4Energy Energy is the capacity to do work Work is done when a force moves an objectLight is a form of energy – electromagnetic energyThe Law of Conservation of Energy – energy cannot be created or destroyed, it can only change from one form to another
5Forms of Energy Electromagnetic (Light) Electrical Thermal (heat) MechanicalNuclearChemical energyGravitational energy
6Potential Energy Potential = Stored energy Gravitational energy – energy an object has because of its position; anything “up high”Chemical energy – energy stored in a substanceFuelBatteriesFoodNuclear energy – energy stored in the nucleus of an atomSun
7Kinetic Energy Kinetic energy = energy in motion Mechanical (motion) energy – movement of objects of substances from one place to anotherElectrical energy – electricity moving through an objectElectromagnetic – energy that travels in wavesLightThermal (heat) energy – vibration of atoms to make heatFriction
9Energy Transformations Example 1: Toaster plugged into an outletElectrical ThermalExample 2: Plugging a fan into an outlet_______________ _________________ and _______________Example 3: Wind turbine to light
10Now that we’ve practiced… What energy transformations took place in the flashlight and the candle?Flashlight:Candle: