* Pebble's Velocity: A pebble doesn't have its own inherent velocity. It's carried along by the water. Therefore, the pebble's velocity is directly determined by the speed and direction of the water flow.
* Stream's Velocity: The stream's velocity is the speed and direction of the water itself. This can vary depending on factors like the stream's gradient, volume of water, and obstacles.
Key Points:
* Faster stream, faster pebble: The faster the water flows in the stream, the faster the pebble will move.
* Direction: The pebble will move in the same direction as the water flow.
* Friction: The pebble's velocity can be slightly affected by friction with the streambed and the surrounding water.
In summary: The velocity of a pebble in a stream is essentially the same as the velocity of the stream itself. It's a consequence of the water carrying the pebble along.
