2 What 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.
3 Luminous 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
4 Energy 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
5 Forms of Energy Electromagnetic (Light) Electrical Thermal (heat) MechanicalNuclearChemical energyGravitational energy
6 Potential 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
7 Kinetic 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
9 Energy Transformations Example 1: Toaster plugged into an outletElectrical ThermalExample 2: Plugging a fan into an outlet_______________ _________________ and _______________Example 3: Wind turbine to light
10 Now that we’ve practiced… What energy transformations took place in the flashlight and the candle?Flashlight:Candle: