According to the law of conservation of mechanical energy, if the only force acting on this pendulum is gravity, the total energy of the system is

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According to the law of conservation of mechanical energy, if the only force acting on this pendulum is gravity, the total energy system is ____

the same at a, b and c

The law of conservation of mechanical energy states that the total mechanical energy of a system remains constant if the only forces acting on the system are conservative forces, such as gravity. This means that the sum of the kinetic energy and potential energy of the system remains constant.

In the case of a simple pendulum, gravity is the only force acting on the pendulum bob. As the pendulum swings back and forth, its energy continuously interchanges between kinetic energy and potential energy.

At the highest point of the pendulum's swing (when it is momentarily at rest), all of its energy is in the form of potential energy. As the pendulum swings downward, potential energy is converted into kinetic energy. At the lowest point of the swing (when the pendulum is at its maximum speed), all of its energy is in the form of kinetic energy.

At any point in the pendulum's motion, the total mechanical energy (sum of kinetic and potential energy) remains constant, assuming no energy losses due to friction or other non-conservative forces. Therefore, the total energy of the pendulum system is the same regardless of where it is in its swing.