For Question, give a specific example of a system with the energy transformation shown. In these questions, W is the work done on the system, and are the kinetic, potential, and thermal energies of the system, respectively. Any energy not mentioned in the transformation is assumed to remain constant; if work is not mentioned, it is assumed to be zero. ? K ? ?U

ANSWER: Here as there are no other energy present in the equation, they are assumed to be constant. The kinetic energy converted to the potential energy here, so the best example of it is, Imagine a bob attached with a string and making simple harmonic oscillation. Here we will consider the moment when the bob will move upwards from the mean position. At the mean position, the kinetic energy of the bob is maximum and the potential energy is zero as it has not displaced from it’s mean position. As it moves upward, the kinetic energy decreases and converted to potential energy. When it will reach the maximum height, there the kinetic energy is zero and the potential energy will be maximum. This example also illustrates the law of conservation of mechanical energy.