An example of a real-life application that explains the law of conservation of energy is cross-country skiing that involves gravitational force. The skier has to overcome gravitational forces in order to move up the hill. During skiing, kinetic energy is transformed to potential energy and vice versa. When a skier is at the bottom and in motion, kinetic energy is at its maximum. However, as he speeds up the mountain, kinetic energy gradually decreases as the skiing speed reduces. Conversely, the skierâ€™s potential energy increases as the speed decreases. After reaching the top of the hill, potential energy is at its maximum. On the other hand, kinetic energy is zero because of the stationary state. Factors such as gravitational force and friction are also involved in the energy transformation cycle. Kinetic energy is calculated using the following formula. Kinetic energy = Â½ mv2Â (Shipman et. al, 2009). According to this formula, kinetic energy is half the product of the skierâ€™s mass multiplied by the square of velocity. On the other hand, the product of mass, gravity and height gives potential energy. Therefore, potential energy = m Ã— g Ã— h (Viegas, 2005). According to the law of energy conservation, Ki + Pi =Kf (Viegas, 2005). As the skier speeds down the hill, potential energy is converted to kinetic energy. Kinetic energy increases with increase in speed. Conversely, potential energy decreases with decrease in skiing speed.
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