Have you ever wondered…what caused a person wearing rollerblades to start forward when they are at rest or how does the friction occur between the skates and the ground??? Well in order for the in-line skater to begin moving, he or she must experience a force in the direction of motion which causes her to accelerate from rest to some velocity. An inline skater at rest is only exerting a force down upon the ground (gravity) and the ground is exerting an opposite but equal force up on the skater. All four wheels of the rollerblade are in contact with the surface. The wheels begin to rotate due to the frictional force (static friction) between the wheels and the surface. The static friction exerts torques on the wheels which makes them spin. In order to eliminate any sliding friction, the rollerblade wheels rotate using a ball bearing system. To get a full grasp on the friction and rollerblading click on the link below.
Rollerblading and Friction Fun!!!