First Night Video

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Energy: Energy makes changes possible. We use it while dong things. It moves cars along the road and bots over the water. It cooks our food and keeps ice frozen in the freezer. It plays our favorite songs on the radio and lights our homes. Energy is needed for our bodies to grow. Scientists define energy as: Energy is the ability to work.
Form of Energy: Energy is found in different form s such as light, heat, chemical energy, etc. We can put all the forms of energy into two categories: Potential and Kinetic. Potential Energy: Potential energy is that is sorted in an object due to changes int its position. It is written as P.E When we stretch a rubber band or lift a stone to some height, energy is stored in these objects, this energy is called potential energy. Chemical Energy: Chemical energy is a form of potential energy. It is stored in food batteries and fuels such as coal, petrol and natural gas. Food, fuels and batteries release chemical energy as a result of chemical reactions. Heat Energy: Heat is a form of energy. It is the movement of particles with in the substance. When we heat up an object, its particles move and collide faster. Heat can move from one place to other. Head cooks food. It changes solids into liquid and liquid into vapors. The sun is the major source of heat for us. Light Energy: Light is a form of energy. The sun is the major source of light for us. Light helps plants to make food. Some calculators use light energy to work. The light passing through the lens of a camera makes an image on the film. Electrical Energy: Electrical energy is the movement of electrical charges. Electrical charges moving through a wire is called electricity. We use many appliances at home which use electricity. Can you name such appliance? Lightning is another example of electrical energy. Sound Energy: Sound is also a form of energy. Sound energy is produced by the vibrating body. Place small pieces of paper on the surface of a stereo deck. The sound energy causes the pieces of paper to move. When you speak your sound vibrates the eardrums of your friend. The energy in sound is far less than other forms of energy. Conversion of different form of Energy: Conversion of energy mean energy chances one form of energy can be changes into another form. Let us discus some energy changes. 1. When we lift a toy car to the top of the ramp, potential energy is stored in it. When we let it go down, the ramp, its move and gains kinetic energy. 2. Wood, natural gas, petrol etc.
all fuels have chemical energy (potential energy). When we burn these fuels, their energy changes to light and heat energy. 3. When we witch on a bulb, the electrical energy changes into light energy. 4. We eat food when we run. The chemical energy (potential energy) of food changes to which energy? 5. Switch on the radio. Can you explain the inter conversation of energies?