2EnergyEnergy is the ability to cause change. Energy allows movement in the world.
3Potential EnergyThe energy an object has because of where it is or its shape.
4Kinetic EnergyKinetic energy is the energy of motion. Any moving object has kinetic energy.
5ElectricityElectricity is a form of energy that people make by using other kinds of energy found in nature such as wind, moving water, oil, or coal.
6Fossil FuelAll living organisms store energy. When they die, their bodies are slowly buried by soil and rocks. Over millions of years, some of this material may be pressed together until it turns into fuel, like oil or coal.
7HibernationHibernation is a state of reduced metabolic activity and body temperature used by certain mammals as an adaptation to winter weather.
15VibrateVibrate means to move back and forth quickly.
16CircuitThe path the electricity follows from the battery, through the bulb and back again is called a circuit.
17What forms of energy does sunlight provide? Heat and light
18Why would people want to change sunlight into electricity? All living things depend on sunlight, but the appliances and machines we use require another kind of energy: electricity
19How is sunlight changed into electricity? Energy from sunlight is converted by food by plants and then eaten by animals. Dead organisms (mostly plants or plantlike organisms) form fossil fuels which can be burned to make electricity.
20How does energy change as it moves from sunlight to electricity It changes form. First it is light and heat energy. Then it is food energy. Then it is fuel energy. Then it is electric energy. Both machines and living things can change energy into other forms.
21Energy of MotionEnergy of motion produces heat. This heat warms your body.