How is friction involved in sledding and skiing?

How is friction involved in sledding and skiing?


Friction plays a very important role in sledding and skiing. The friction causes a little heat between the boot and the snow. It melts the snow a little bit to let you move and turn. It also enables you to slow down if you think you are going forward too fast, 

i just learnt this recently but i need to look through my notes again

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

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