The term stress fracture, in many cases of overuse injury, is a misnomer. This term does not represent the nature and diversity of this frequently found injury. The term, âChronic Repetitive Stress Injury of Boneâ, better suits this injury in its myriad manifestations.he higher grades of stress injury are similar to fatigue fractures of other materials. Bone is noted to fail more readily in tension than in compression. This means that the forces which tend to âpullâ are more dangerous to bone failure and injury than compressive forces.
Wind power or wind energy describes the process by which the wind is used to generate mechanical power or electricity. Wind turbines convert the kinetic energy in the wind into mechanical power.
From old Holland to farms in the United States, windmills have been used for pumping water or grinding grain. Today, the windmill's modern equivalent-a wind turbine-can use the wind's energy to generate electricity. Wind turbines, like windmills, are mounted on a tower to capture the most energy. At 100 feet (30 meters) or more aboveground, they can take advantage of the faster and less turbulent wind. Turbines catch the wind's energy with their propeller-like blades. Usually, two or three blades are mounted on a shaft to form a rotor.