When a car is moving it has kinetic energy. When a car is sitting on top of a hill it has potential energy. By hitting the brakes, that kinetic energy is absorbed by the brake pads via friction and converted into heat energy. The friction of the tires is also what provides for turning.
Glaciers change the surface of the land in several ways. By pushing rocks and gravel along with its encroachment a glacier leaves that material behind when it retreats. Most glaciers have water melting out of them when it gets above freezing. That water erodes the landscape forming streams and rivers.
Today glaciers cover about 10% of the land surface on Earth, but there have been times in Earth's recent history when glaciers have covered as much as 30% of the land surface. Around eight to six hundred million years ago, geologists believe that almost all of the Earth was covered in snow and ice.n mountainous areas, often many smaller glaciers flow from higher elevations joining the main glacier as they move to lower places. Generally, these smaller glaciers carve shallower 'U' shaped valleys than the main glacier.