Presentation on theme: " Lesson 2 How is light produced?. What light is VS. What light isn’t WHAT LIGHT ISWHAT LIGHT ISN’T Light is bright rays.Light isn’t dark. Light is a."— Presentation transcript:
Lesson 2 How is light produced?
What light is VS. What light isn’t WHAT LIGHT ISWHAT 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.
Sources of Light LUMINOUSREFLECTED LightbulbMirrors FireRoad signs LightningMovie screen Glow sticksMoon Luminous means these objects can produce or give out their own light
Energy Energy is the capacity to do work Work is done when a force moves an object Light is a form of energy – electromagnetic energy The Law of Conservation of Energy – energy cannot be created or destroyed, it can only change from one form to another
Forms of Energy Electromagnetic (Light) Electrical Thermal (heat) Mechanical Nuclear Chemical energy Gravitational energy
Potential Energy Potential = Stored energy Gravitational energy – energy an object has because of its position; anything “up high” Chemical energy – energy stored in a substance Fuel Batteries Food Nuclear energy – energy stored in the nucleus of an atom Sun
Kinetic Energy Kinetic energy = energy in motion Mechanical (motion) energy – movement of objects of substances from one place to another Electrical energy – electricity moving through an object Electromagnetic – energy that travels in waves Light Thermal (heat) energy – vibration of atoms to make heat Friction
Energy Transformations Example 1: Toaster plugged into an outlet Electrical Thermal Example 2: Plugging a fan into an outlet _______________ _________________ and _______________ Example 3: Wind turbine to light _______________ _________________ and _______________
Now that we’ve practiced… What energy transformations took place in the flashlight and the candle? Flashlight: Candle: