ABSTRACT

The energy contained in the wind depends on its velocity, density, and moisture content. A hammer striking the head of a nail delivers its kinetic energy to the nail, forcing it into the wood some distance, performing some work. Energy can be stored by lifting something above the ground. The energy can then be released, allowing it to fall back to the ground, turning this potential into kinetic energy. A hammer striking the head of a nail delivers its kinetic energy to the nail, forcing it into the wood some distance, performing some work. A fuel cell consists of two electrodes contained in an electrolyte. A chemical reaction takes place at the electrodes, removing an electron from the hydrogen, attaching itself to one electrode and the positive proton to the other electrode. A windmill can take the kinetic energy of the wind and use it to pump water, mill corn, and generate electricity.