DEFINING ENERGY Energy is another word for power Energy makes things move It makes things warm It also makes machines work and makes living things grow People use energy from many different sources They use the power of wind water and sunlight Plants and animals provide people with energy in the form of food People also burn oil coal and natural gas for energy They wind water Sunlight Feed o Cool Natural Gas Uranium hydroelectric down All over the world energy is available in many forms How many kinds of energy can you see suggested by this
Figure 1 get nuclear energy from uranium Figure 2 Each of these forms of energy can be described as either potential energy or kinetic energy Energy cannot be created or destroyed It can only be changed from one form to another Figure 3 Figure 4 AP Energyi measured by how much work it does People measure heat energy in units called joules or calories The potential energy in electricity is measured in volts A wrecking crane uses energy to swing a heavy ball and that ball delivers a powerful blow right on
KINETIC ENERGY E Kinetic energy is the energy of motion The word kinetic means active and relates to the motion of physical objects All moving objects have kinetic energy even atoms Atoms are the tiny building blocks that make up everything Forms of kinetic energy perform work SK The small movements of a jackhammer are kinetic energy They have BC TE enough power to break concrete and
a The work done by kinetic energy can be seen everywhere River water turbine 1S has kinetic energy that can dig deep an engine that canyons as a river rushes downhill turns when its pulled by gravity Sailboats use the vanes are pushed kinetic energy of wind to move them by a moving along An electric fan uses the kinetic fluid such as air energy of its turning vanes to push air or water and make a breeze Kinetic energy can turn turbines to power many kinds of machines The blades of a wind turbine turn in the wind to make electricity for people to
