Describe what friction is and explain why a car would experience greater friction on a dry road compared to an icy road.

Friction is a force that resists the motion of one surface over another. It occurs when two surfaces come into contact and attempt to slide across each other. The frictional force is directly proportional to the force pushing the two surfaces together and depends on the nature of the surfaces in contact.

A car would experience greater friction on a dry road compared to an icy road due to the differences in the surfaces. A dry road has a rougher surface, which increases the contact points between the road and the car's tires. This increased contact leads to a higher frictional force, which helps the car grip the road better.

On the other hand, an icy road is much smoother, reducing the contact points between the road and the tires. This results in a lower frictional force, making it harder for the car to grip the road and increasing the likelihood of the car sliding or skidding.