There is a lot of physics though out the process of roller blading. There is Newtons 1st law, friction, work, and if your not too good at it; collision.
Newtons 1st Law: Also known as the Law of Motion, Newton's 1st law states that if the net force exerted on an object is zero, the object continues in its original state of motion. In other words, if your rolling down a hill with no breaks, your wont stop until something gets in the way to stop you.
Friction: Kinetic friction is the frictional force for an object in motion. The magnitude of the force of kinetic friction acting between two surfaces is given by the equation. This is best used when trying to stop, you would put the toe stopper to the floor so the friction between the ground and skate would cause you to slow down or stop completely.
Work: Work is defined as the product of the component of the force along the direction of displacement and the magnitude of displacement. This comes into play if your just learning how to skate, the person teaching you may have to hold you up, therefor doing work.
Collision: In an elastic collision, momentum and kinetic energy are conserved. This is for when you just begin skating or aren't very good, you tend to fall or run into things which causes a collision.
I hope you enjoyed my blog entry on the physics of roller blading, and I hope this helped you see all the ways that physics connects to roller blading.