Examples of such fuels are coal, oil, and uranium, used to produce nuclear energy. This means that they are from fuels mined from the Earth, and their source is not being replaced at a speed fast enough to meet the oncoming demand. Currently, the primary sources of energy are non-renewable. As more and more people use technology like cars and computers in everyday life, the demand for energy is constantly increasing. For example, the kinetic energy of moving water was used for many centuries to move water mills that produce flour.
Humans have used this principle to accomplish numerous difficult tasks with the help of various devices and machines.
Potential and kinetic energy can be used to perform work, such as putting objects in motion. The stone in the example above has the changing amounts of potential and kinetic energy throughout its fall, but the sum of the two is constant, because kinetic energy converts to potential energy, and vice versa. The law of energy conservation states that the total amount of energy in an isolated system stays constant. Eventually kinetic energy reaches the maximum at the moment of impact with the Earth, when the stone stops moving. The stone then falls down, and as it accelerates, kinetic energy increases, while the potential energy decreases. Eventually the potential energy peaks when the stone stops flying up. For example, when a stone is thrown directly up, as it flies and slows down, kinetic energy is converted to potential. When the body is in motion, it has both potential and kinetic energy, and kinetic energy converts to the potential one or vice versa. Once it bounces off the racket and is moving away, it has kinetic energy. At that moment it has potential energy, but not kinetic. Niagara Falls, Ontario, Canadaįor example, when a tennis ball is hit by a racket and stops momentarily, the forces acting upon it (like gravity and the resistance of the racket), make it stay still in that position.
Sir Adam Beck Hydroelectric Power Station.
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