After a sled passed over a snowy path on a hill, the grass or dirt under the snow may begin to show through where the sled has traveled, why?
Friction of the sled causes an increase in temperature which causes melting. Right? It also may compress the snow due to the weight of the sled. Pressure alone on snow may cause melting.
because it has went down several times that the ground shows the marks because like i said it went down several times.
When a sled passes over a snowy path on a hill, the pressure applied by the weight of the sled compresses the snow underneath it. As a result, the snow compacted by the sled becomes denser and gets pushed aside, exposing the surface underneath, which could be grass or dirt.
This phenomenon occurs due to a combination of factors. Firstly, the weight of the sled, along with the force applied by the person riding it, compresses the snow beneath, reducing its volume and increasing its density. This compression pushes the air and moisture out of the snow, making it more solid and compact.
Secondly, as the sled moves forward, its runners or the bottom surface make direct contact with the snow. The concentrated pressure exerted by the sled's runners further compresses the snow, causing it to be pushed aside, revealing the underlying surface.
The grass or dirt under the snow may become visible because the snow in the sled's path has been compacted and displaced by the sled's weight and motion. The compacted snow loses its fluffy texture and becomes more transparent, allowing the surface beneath to show through.
To observe this phenomenon more closely, you can recreate the conditions by taking a sled or any object with a flat bottom surface (like a footstep) and sliding it over a snowy surface. The weight and motion of the object will compress and displace the snow, causing the underlying grass or dirt to become visible.