While sking on snow, a skier wear skis in addition to the shoes. Why ?

Sand is thrown on tracks with snow. Why?

Why is it easier to perform the skating on the snow?

Why is it advised not to wear synthetic clothes while working in a laboratory or working with fire in in the kitchen ?

Holding on to a tow rope moving parallel to a frictionless ski slope, a 45 kg skier is pulled up the slope, which is at an angle of 8.0^(@) with the horizontal. What is the magnitude F_("rope") of the force on the skier from the rope when (a) the magnitude v of the skier's velocity is constant at 2.0 m/s and (b) v = 2.0 m/s as v increases at a rate of 0.10" m"//"s"^(2) ?

Send is spread on tracks covered with snow. Why ?

Why are grooves provided in the soles of shoes ?

Snow is a better heat-insulator than ice, why?

Give explanations : Skiers use long flat skis to slide over the snow.

If a person wearing a narrow-heeled shoe accidentally steps on you, it will hurt more in comparison to a shoe with a wider base. Give reason.