A skateboarder is moving down a ramp and reaches the bottom with a specific velocity. Assuming negligible friction and air resistance, which principle would best describe the skateboarder's motion as they transition from potential energy at the top of the ramp to kinetic energy at the bottom?

When the skateboarder starts at the top of the ramp, his height gives him potential energy. Other options are incorrect because Many think motion alone explains it, as if a skateboarder keeps moving without any push; The principle that the system takes the path that makes a certain quantity smallest is useful for advanced physics, but it doesn’t tell us how much speed the skateboarder gets.