when I slide across a car seat to get out of the car on a cold day, why do I become electrically charged? What is going on at the atomic level? Why does the charge not discharge when my shoes touch the ground? Why does it discharge when I touch a metal car's body?

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.