The last force is the kinetic friction force—it's parallel to the surface. It is this frictional force that slows down the car (since there is no other horizontal force).

As a result of the work done by this friction, the kinetic energy of the disk decreases. This is shown in the initial stage of the animation shown below. As the disk continues to roll with slipping, ...

Keywords: Seismic performance. Nonstructural components. Static friction coefficient. Kinetic friction coefficient. Rigid blocks. Block-type components. Tilt and pull tests. Dynamic analyses.