Our World- Light

This week we started the new unit  “Our World." The world amazes us every day. Hashem created it for us. On the first day of creation Hashem created light and separated it from the dark. He called the light day and the dark- night. Light is all around us. Friends said that light is good because it let us see our friends, toys and all things around, it let us to be safe and do not bump into things when we walk. Friends made list of things that make light- sun, stars, lightning, fire, candle, flashlight, fireworks, fireflies, and lamps. We discovered that things that make light are hot. One of them is SUN that gives us light and warmth. Sun is a closest star to the Earth, that is why we can see it and feel its warmth.

Light travels in straight lines and it goes everywhere; it goes through things that are transparent. Transparent means clear or see through. Such things like glass, window, water, glasses or plastic are transparent. The light could be blocked by opaque things, things that are solid. Walls, doors, blocks, books, people are opaque. When light is blocked by opaque object it stops. An opaque object forms a shadow.

Some things need Energy to make light. Flashlights need batteries, lamps need electricity. Energy is everywhere- it lights up our houses, it warms us up, it plays music and move cars, buses and trains. In class we made a list of the things that we use energy for. Next week we are going to discuss what would happen if energy rans out and how we can save energy.