At the bottom of it's motion because the gravitational potential energy is zero
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Frictionlist pendulum is an example of the pendulum of a clock, a reversible process, free.
The greatest potential energy will be located at the highest point of the pendulum or roller coaster, when the object is farthest from the ground. The greatest kinetic energy will be located at the lowest point of the pendulum or roller coaster, when the object is moving fastest.
Earth's rotation affects a pendulum due to the Coriolis force, which causes the pendulum's plane of oscillation to rotate clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere. This rotation is a result of the pendulum's inertia attempting to maintain its orientation as Earth rotates underneath it. The Coriolis effect causes the apparent deflection of the pendulum's swing.
The period of a pendulum is independent of the angular displacement (within small angles) and the mass of the ball. It is only dependent on the length of the pendulum and the acceleration due to gravity. This is known as the principle of isochronism of the pendulum, first discovered by Galileo.
Is law catalyst for starting the pendulum swinging? or is ethics? politics?